Merge branch 'master' into gh-pages

Conflicts:
	ItemDisguise/.settings/org.eclipse.core.resources.prefs

ItemDisguise/.classpath

@@ -7,6 +7,12 @@
 		</attributes>
 	</classpathentry>
 	<classpathentry combineaccessrules="false" kind="src" path="/ProtocolLib"/>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>

ProtocolLib/pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.comphenix.protocol</groupId>
   <artifactId>ProtocolLib</artifactId>
-  <version>2.3.0</version>
+  <version>2.4.3</version>
   <packaging>jar</packaging>
   <description>Provides read/write access to the Minecraft protocol.</description>
   
@@ -57,7 +57,7 @@
             </goals>
             <configuration>
               <shadedArtifactAttached>false</shadedArtifactAttached>
-              <createDependencyReducedPom>true</createDependencyReducedPom>
+              <createDependencyReducedPom>false</createDependencyReducedPom>
 
               <relocations>
                 <relocation>
@@ -203,7 +203,7 @@
   	<dependency>
   		<groupId>org.bukkit</groupId>
   		<artifactId>craftbukkit</artifactId>
-  		<version>1.4.7-R0.1</version>
+  		<version>1.5.1-R0.2-SNAPSHOT</version>
   		<scope>provided</scope>
   	</dependency>
   	<dependency>

ProtocolLib/src/main/java/com/comphenix/protocol/CleanupStaticMembers.java

@@ -24,6 +24,8 @@ import java.util.List;
 
 import com.comphenix.protocol.async.AsyncListenerHandler;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.ListeningWhitelist;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.injector.BukkitUnwrapper;
@@ -51,6 +53,9 @@ import com.comphenix.protocol.wrappers.nbt.io.NbtBinarySerializer;
  * @author Kristian
  */
 class CleanupStaticMembers {
+	// Reports
+	public final static ReportType REPORT_CANNOT_RESET_FIELD = new ReportType("Unable to reset field %s: %s");
+	public final static ReportType REPORT_CANNOT_UNLOAD_CLASS = new ReportType("Unable to unload class %s.");
 	
 	private ClassLoader loader;
 	private ErrorReporter reporter;
@@ -116,7 +121,9 @@ class CleanupStaticMembers {
 					setFinalStatic(field, null);
 				} catch (IllegalAccessException e) {
 					// Just inform the player
-					reporter.reportWarning(this, "Unable to reset field " + field.getName() + ": " + e.getMessage(), e);
+					reporter.reportWarning(this, 
+							Report.newBuilder(REPORT_CANNOT_RESET_FIELD).error(e).messageParam(field.getName(), e.getMessage())
+					);
 				}
 			}
 		}
@@ -151,7 +158,7 @@ class CleanupStaticMembers {
 				output.add(loader.loadClass(name));
 			} catch (ClassNotFoundException e) {
 				// Warn the user
-				reporter.reportWarning(this, "Unable to unload class " + name, e);
+				reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_UNLOAD_CLASS).error(e).messageParam(name));
 			}
 		}
 		

ProtocolLib/src/main/java/com/comphenix/protocol/CommandBase.java

@@ -23,6 +23,8 @@ import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 
 /**
  * Base class for all our commands.
@@ -30,6 +32,8 @@ import com.comphenix.protocol.error.ErrorReporter;
  * @author Kristian
  */
 abstract class CommandBase implements CommandExecutor {
+	public static final ReportType REPORT_COMMAND_ERROR = new ReportType("Cannot execute command %s.");
+	public static final ReportType REPORT_UNEXPECTED_COMMAND = new ReportType("Incorrect command assigned to %s.");
 	
 	public static final String PERMISSION_ADMIN = "protocol.admin";
 	
@@ -55,6 +59,7 @@ abstract class CommandBase implements CommandExecutor {
 		try {
 			// Make sure we're dealing with the correct command
 			if (!command.getName().equalsIgnoreCase(name)) {
+				reporter.reportWarning(this, Report.newBuilder(REPORT_UNEXPECTED_COMMAND).messageParam(this));
 				return false;
 			}
 			if (permission != null && !sender.hasPermission(permission)) {
@@ -66,11 +71,14 @@ abstract class CommandBase implements CommandExecutor {
 			if (args != null && args.length >= minimumArgumentCount) {
 				return handleCommand(sender, args);
 			} else {
+				sender.sendMessage(ChatColor.RED + "Insufficient commands. You need at least " + minimumArgumentCount);
 				return false;
 			}
 			
 		} catch (Exception e) {
-			reporter.reportDetailed(this, "Cannot execute command " + name, e, sender, label, args);
+			reporter.reportDetailed(this, 
+					Report.newBuilder(REPORT_COMMAND_ERROR).error(e).messageParam(name).callerParam(sender, label, args)
+			);
 			return true;
 		}
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/CommandFilter.java

@@ -0,0 +1,482 @@
+package com.comphenix.protocol;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.conversations.Conversable;
+import org.bukkit.conversations.Conversation;
+import org.bukkit.conversations.ConversationAbandonedEvent;
+import org.bukkit.conversations.ConversationAbandonedListener;
+import org.bukkit.conversations.ConversationContext;
+import org.bukkit.conversations.ConversationFactory;
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.MultipleLinesPrompt.MultipleConversationCanceller;
+import com.comphenix.protocol.concurrency.IntegerSet;
+import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
+import com.comphenix.protocol.events.PacketEvent;
+import com.google.common.collect.DiscreteDomains;
+import com.google.common.collect.Range;
+import com.google.common.collect.Ranges;
+
+/**
+ * A command to apply JavaScript filtering to the packet command.
+ * 
+ * @author Kristian
+ */
+public class CommandFilter extends CommandBase {
+	public static final ReportType REPORT_FALLBACK_ENGINE = new ReportType("Falling back to the Rhino engine.");
+	public static final ReportType REPORT_CANNOT_LOAD_FALLBACK_ENGINE = new ReportType("Could not load Rhino either. Please upgrade your JVM or OS.");
+	public static final ReportType REPORT_PACKAGES_UNSUPPORTED_IN_ENGINE = new ReportType("Unable to initialize packages for JavaScript engine.");
+	public static final ReportType REPORT_FILTER_REMOVED_FOR_ERROR = new ReportType("Removing filter %s for causing %s.");
+	public static final ReportType REPORT_CANNOT_HANDLE_CONVERSATION = new ReportType("Cannot handle conversation.");
+	
+	public interface FilterFailedHandler{
+		/**
+		 * Invoked when a given filter has failed.
+		 * @param event - the packet event.
+		 * @param filter - the filter that failed.
+		 * @param ex - the failure.
+		 * @returns TRUE to keep processing this filter, FALSE to remove it.
+		 */
+		public boolean handle(PacketEvent event, Filter filter, Exception ex);
+	}
+	
+	/**
+	 * Possible sub commands.
+	 * 
+	 * @author Kristian
+	 */
+	private enum SubCommand {
+		ADD, REMOVE;
+	}
+	
+	/**
+	 * A filter that will be used to process a packet event.
+	 * @author Kristian
+	 */
+	public static class Filter {
+		private final String name;
+		private final String predicate;
+		
+		private final IntegerSet ranges;
+		
+		/**
+		 * Construct a new immutable filter.
+		 * @param name - the unique name of the filter.
+ 		 * @param predicate - the JavaScript predicate that will be used to filter packet events.
+		 * @param ranges - a list of valid packet ID ranges that this filter applies to.
+		 */
+		public Filter(String name, String predicate, Set<Integer> packets) {
+			this.name = name;
+			this.predicate = predicate;
+			this.ranges = new IntegerSet(Packets.MAXIMUM_PACKET_ID + 1);
+			this.ranges.addAll(packets);
+		}
+		
+		/**
+		 * Retrieve the unique name of the filter.
+		 * @return Unique name of the filter.
+		 */
+		public String getName() {
+			return name;
+		}
+		
+		/**
+		 * Retrieve the JavaScript predicate that will be used to filter packet events.
+		 * @return Predicate itself.
+		 */
+		public String getPredicate() {
+			return predicate;
+		}
+		
+		/**
+		 * Retrieve a copy of the set of packets this filter applies to.
+		 * @return Set of packets this filter applies to.
+		 */
+		public Set<Integer> getRanges() {
+			return ranges.toSet();
+		}
+		
+		/**
+		 * Determine whether or not a packet event needs to be passed to this filter.
+		 * @param event - the event to test.
+		 * @return TRUE if it does, FALSE otherwise.
+		 */
+		private boolean isApplicable(PacketEvent event) {
+			return ranges.contains(event.getPacketID());
+		}
+		
+		/**
+		 * Evaluate the current filter using the provided ScriptEngine as context.
+		 * <p>
+		 * This context may be modified with additional code.
+		 * @param context - the current script context.
+		 * @param event - the packet event to evaluate.
+		 * @return TRUE to pass this packet event on to the debug listeners, FALSE otherwise.
+		 * @throws ScriptException If the compilation failed or the filter is not valid.
+		 */
+		public boolean evaluate(ScriptEngine context, PacketEvent event) throws ScriptException {
+			if (!isApplicable(event))
+				return true;
+			// Ensure that the predicate has been compiled
+			compile(context);
+			
+			try {
+				Object result = ((Invocable) context).invokeFunction(name, event, event.getPacket().getHandle());
+				
+				if (result instanceof Boolean)
+					return (Boolean) result;
+				else
+					throw new ScriptException("Filter result wasn't a boolean: " + result);
+				
+			} catch (NoSuchMethodException e) {
+				// Must be a fault with the script engine itself
+				throw new IllegalStateException("Unable to compile " + name + " into current script engine.", e);
+			}
+		}
+		
+		/**
+		 * Force the compilation of a specific filter.
+		 * @param context - the current script context.
+		 * @throws ScriptException If the compilation failed.
+		 */
+		public void compile(ScriptEngine context) throws ScriptException {
+			if (context.get(name) == null) {
+				context.eval("var " + name + " = function(event, packet) {\n" + predicate);
+			}
+		}
+		
+		/**
+		 * Clean up all associated code from this filter in the provided script engine.
+		 * @param context - the current script context.
+		 */
+		public void close(ScriptEngine context) {
+			context.put(name, null);
+		}
+	}
+	
+	private class CompilationSuccessCanceller implements MultipleConversationCanceller {
+		@Override
+		public boolean cancelBasedOnInput(ConversationContext context, String in) {
+			throw new UnsupportedOperationException("Cannot cancel on the last line alone.");
+		}
+
+		@Override
+		public void setConversation(Conversation conversation) {
+			// Ignore
+		}
+
+		@Override
+		public boolean cancelBasedOnInput(ConversationContext context, String currentLine, StringBuilder lines, int lineCount) {
+			try {
+				engine.eval("function(event, packet) {\n" + lines.toString());
+				
+				// It compiles - accept the filter!
+				return true;
+			} catch (ScriptException e) {
+				// We also have the function() line
+				int realLineCount = lineCount + 1;
+				
+				// Only possible to recover from an error on the last line.
+				return e.getLineNumber() < realLineCount;
+			}
+		}
+		
+		@Override
+		public CompilationSuccessCanceller clone() {
+			return new CompilationSuccessCanceller();
+		}
+	}
+	
+	/**
+	 * Name of this command.
+	 */
+	public static final String NAME = "filter";
+	
+	// Default error handler
+	private FilterFailedHandler defaultFailedHandler;
+	
+	// Currently registered filters
+	private List<Filter> filters = new ArrayList<Filter>();
+	
+	// Owner plugin
+	private final Plugin plugin;
+	
+	// Whether or not the command is enabled
+	private ProtocolConfig config;
+	
+	// Script engine
+	private ScriptEngine engine;
+	
+	public CommandFilter(ErrorReporter reporter, Plugin plugin, ProtocolConfig config) {
+		super(reporter, CommandBase.PERMISSION_ADMIN, NAME, 2);
+		this.plugin = plugin;
+		this.config = config;
+		
+		// Start the engine
+		initalizeScript();
+	}
+	
+	private void initalizeScript() {
+		try {
+			// First attempt
+			initializeEngine();
+			
+			// Oh for ..
+			if (!isInitialized()) {
+				throw new ScriptException("A JavaScript engine could not be found.");
+			}
+		} catch (ScriptException e1) {
+			// It's not a huge deal
+			printPackageWarning(e1);
+			
+			if (!config.getScriptEngineName().equals("rhino")) {
+				reporter.reportWarning(this, Report.newBuilder(REPORT_FALLBACK_ENGINE));
+				config.setScriptEngineName("rhino");
+				config.saveAll();
+				
+				try {
+					initializeEngine();
+					
+					if (!isInitialized()) {
+						reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_LOAD_FALLBACK_ENGINE));
+					}
+				} catch (ScriptException e2) {
+					// And again ..
+					printPackageWarning(e2);
+				}
+			}
+		}
+	}
+	
+	private void printPackageWarning(ScriptException e) {
+		reporter.reportWarning(this, Report.newBuilder(REPORT_PACKAGES_UNSUPPORTED_IN_ENGINE).error(e));
+	}
+	
+	/**
+	 * Initialize the current configured engine.
+	 * @throws ScriptException If we are unable to import packages.
+	 */
+	private void initializeEngine() throws ScriptException {
+		ScriptEngineManager manager = new ScriptEngineManager();
+		engine = manager.getEngineByName(config.getScriptEngineName());
+		
+		// Import useful packages
+		if (engine != null) {
+			engine.eval("importPackage(org.bukkit);");
+			engine.eval("importPackage(com.comphenix.protocol.reflect);");
+		}
+	}
+	
+	/**
+	 * Determine if the filter engine has been successfully initialized.
+	 * @return TRUE if it has, FALSE otherwise.
+	 */
+	public boolean isInitialized() {
+		return engine != null;
+	}
+
+	private FilterFailedHandler getDefaultErrorHandler() {
+		// No need to create a new object every time
+		if (defaultFailedHandler == null) {
+			defaultFailedHandler = new FilterFailedHandler() {
+				@Override
+				public boolean handle(PacketEvent event, Filter filter, Exception ex) {
+					reporter.reportMinimal(plugin, "filterEvent(PacketEvent)", ex, event);
+					reporter.reportWarning(this, 
+							Report.newBuilder(REPORT_FILTER_REMOVED_FOR_ERROR).messageParam(filter.getName(), ex.getClass().getSimpleName())
+					);
+					return false;
+				}
+			};
+		}
+		return defaultFailedHandler;
+	}
+	
+	/**
+	 * Determine whether or not to pass the given packet event to the packet listeners.
+	 * <p>
+	 * Uses a default filter failure handler that simply prints the error message and removes the filter.
+	 * @param event - the event.
+	 * @return TRUE if we should, FALSE otherwise.
+	 */
+	public boolean filterEvent(PacketEvent event) {
+		return filterEvent(event, getDefaultErrorHandler());
+	}
+	
+	/**
+	 * Determine whether or not to pass the given packet event to the packet listeners.
+	 * @param event - the event.
+	 * @param handler - failure handler.
+	 * @return TRUE if we should, FALSE otherwise.
+	 * @throws FilterFailedException If one of the filters failed.
+	 */
+	public boolean filterEvent(PacketEvent event, FilterFailedHandler handler) {
+		for (Iterator<Filter> it = filters.iterator(); it.hasNext(); ) {
+			Filter filter = it.next();
+			
+			try {
+				if (!filter.evaluate(engine, event)) {
+					return false;
+				}
+			} catch (Exception ex) {
+				if (!handler.handle(event, filter, ex)) {
+					it.remove();
+				}
+			}
+		}
+		// Pass!
+		return true;
+	}
+
+	/*
+	 * Description: Adds or removes a simple packet filter.
+       Usage:       /<command> add|remove name [packet IDs]
+	 */
+	@Override
+	protected boolean handleCommand(CommandSender sender, String[] args) {
+		if (!config.isDebug()) {
+			sender.sendMessage(ChatColor.RED + "Debug mode must be enabled in the configuration first!");
+			return true;
+		}
+		if (!isInitialized()) {
+			sender.sendMessage(ChatColor.RED + "JavaScript engine was not present. Filter system is disabled.");
+			return true;
+		}
+		
+		final SubCommand command = parseCommand(args, 0);
+		final String name = args[1];
+		
+		switch (command) {
+			case ADD:
+				// Never overwrite an existing filter
+				if (findFilter(name) != null) {
+					sender.sendMessage(ChatColor.RED + "Filter " + name + " already exists. Remove it first.");
+					return true;
+				}
+				
+				final Set<Integer> packets = parseRanges(args, 2);
+				sender.sendMessage("Enter filter program ('}' to complete or CANCEL):");
+				
+				// Make sure we can use the conversable interface
+				if (sender instanceof Conversable) {
+					final MultipleLinesPrompt prompt = 
+							new MultipleLinesPrompt(new CompilationSuccessCanceller(), "function(event, packet) {");
+					
+					new ConversationFactory(plugin).
+						withFirstPrompt(prompt).
+						withEscapeSequence("CANCEL").
+						withLocalEcho(false).
+						addConversationAbandonedListener(new ConversationAbandonedListener() {
+							@Override
+							public void conversationAbandoned(ConversationAbandonedEvent event) {
+								try {
+									final Conversable whom = event.getContext().getForWhom();
+									
+									if (event.gracefulExit()) {
+										String predicate = prompt.removeAccumulatedInput(event.getContext());
+										Filter filter = new Filter(name, predicate, packets);
+	
+										// Print the last line as well
+										whom.sendRawMessage(prompt.getPromptText(event.getContext()));
+										
+										try {
+											// Force early compilation
+											filter.compile(engine);
+											
+											filters.add(filter);
+											whom.sendRawMessage(ChatColor.GOLD + "Added filter " + name);
+										} catch (ScriptException e) {
+											e.printStackTrace();
+											whom.sendRawMessage(ChatColor.GOLD + "Compilation error: " + e.getMessage());
+										}
+									} else {
+										// Too bad
+										whom.sendRawMessage(ChatColor.RED + "Cancelled filter.");
+									}
+								} catch (Exception e) {
+									reporter.reportDetailed(this, 
+											Report.newBuilder(REPORT_CANNOT_HANDLE_CONVERSATION).error(e).callerParam(event)
+									);
+								}
+							}
+						}).
+						buildConversation((Conversable) sender).
+						begin();
+				} else {
+					sender.sendMessage(ChatColor.RED + "Only console and players are supported!");
+				}
+				
+				break;
+				
+			case REMOVE:
+				Filter filter = findFilter(name);
+				
+				// See if it exists before we remove it
+				if (filter != null) {
+					filter.close(engine);
+					filters.remove(filter);
+					sender.sendMessage(ChatColor.GOLD + "Removed filter " + name);
+				} else {
+					sender.sendMessage(ChatColor.RED + "Unable to find a filter by the name " + name);
+				}
+				break;
+		}
+		
+		return true;
+	}
+	
+	private Set<Integer> parseRanges(String[] args, int start) {
+		List<Range<Integer>> ranges = RangeParser.getRanges(args, 2, args.length - 1, Ranges.closed(0, 255));
+		Set<Integer> flatten = new HashSet<Integer>();
+		
+		if (ranges.isEmpty()) {
+			// Use every packet ID
+			ranges.add(Ranges.closed(0, 255));
+		}
+		
+		// Finally, flatten it all
+		for (Range<Integer> range : ranges) {
+			flatten.addAll(range.asSet(DiscreteDomains.integers()));
+		}
+		return flatten;
+	}
+	
+	/**
+	 * Lookup a filter by its name.
+	 * @param name - the filter name.
+	 * @return The filter, or NULL if not found.
+	 */
+	private Filter findFilter(String name) {
+		// We'll just use a linear scan for now - we don't expect that many filters
+		for (Filter filter : filters) {
+			if (filter.getName().equalsIgnoreCase(name)) {
+				return filter;
+			}
+		}
+		return null;
+	}
+	
+	private SubCommand parseCommand(String[] args, int index) {
+		String text = args[index].toUpperCase();
+		
+		try {
+			return SubCommand.valueOf(text);
+		} catch (IllegalArgumentException e) {
+			throw new IllegalArgumentException(text + " is not a valid sub command. Must be add or remove.", e);
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/CommandPacket.java

@@ -36,6 +36,8 @@ import org.bukkit.plugin.Plugin;
 
 import com.comphenix.protocol.concurrency.AbstractIntervalTree;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.ConnectionSide;
 import com.comphenix.protocol.events.ListenerPriority;
 import com.comphenix.protocol.events.ListeningWhitelist;
@@ -57,6 +59,7 @@ import com.google.common.collect.Sets;
  * @author Kristian
  */
 class CommandPacket extends CommandBase {
+	public static final ReportType REPORT_CANNOT_SEND_MESSAGE = new ReportType("Cannot send chat message.");
 	
 	private interface DetailedPacketListener extends PacketListener {
 		/**
@@ -93,11 +96,15 @@ class CommandPacket extends CommandBase {
 	private AbstractIntervalTree<Integer, DetailedPacketListener> clientListeners = createTree(ConnectionSide.CLIENT_SIDE);
 	private AbstractIntervalTree<Integer, DetailedPacketListener> serverListeners = createTree(ConnectionSide.SERVER_SIDE);
 	
-	public CommandPacket(ErrorReporter reporter, Plugin plugin, Logger logger, ProtocolManager manager) {
+	// Filter packet events
+	private CommandFilter filter;
+	
+	public CommandPacket(ErrorReporter reporter, Plugin plugin, Logger logger, CommandFilter filter, ProtocolManager manager) {
 		super(reporter, CommandBase.PERMISSION_ADMIN, NAME, 1);
 		this.plugin = plugin;
 		this.logger = logger;
 		this.manager = manager;
+		this.filter = filter;
 		this.chatter = new ChatExtensions(manager);
 	}
 	
@@ -162,7 +169,9 @@ class CommandPacket extends CommandBase {
 		try {
 			chatter.sendMessageSilently(receiver, message);
 		} catch (InvocationTargetException e) {
-			reporter.reportDetailed(this, "Cannot send chat message.", e, receiver, message);
+			reporter.reportDetailed(this, 
+					Report.newBuilder(REPORT_CANNOT_SEND_MESSAGE).error(e).callerParam(receiver, message)
+			);
 		}
 	}
 	
@@ -175,7 +184,9 @@ class CommandPacket extends CommandBase {
 		try {
 			chatter.broadcastMessageSilently(message, permission);
 		} catch (InvocationTargetException e) {
-			reporter.reportDetailed(this, "Cannot send chat message.", e, message, permission);
+			reporter.reportDetailed(this, 
+					Report.newBuilder(REPORT_CANNOT_SEND_MESSAGE).error(e).callerParam(message, permission)
+			);
 		}
 	}
 	
@@ -336,6 +347,7 @@ class CommandPacket extends CommandBase {
 			supported.addAll(Packets.Client.getSupported());
 		else if (side.isForServer())
 			supported.addAll(Packets.Server.getSupported());
+		
 		return supported;
 	}
 	
@@ -362,7 +374,6 @@ class CommandPacket extends CommandBase {
 	}
 		
 	public DetailedPacketListener createPacketListener(final ConnectionSide side, int idStart, int idStop, final boolean detailed) {
-		
 		Set<Integer> range = Ranges.closed(idStart, idStop).asSet(DiscreteDomains.integers());
 		Set<Integer> packets;
 		
@@ -386,14 +397,14 @@ class CommandPacket extends CommandBase {
 		return new DetailedPacketListener() {
 			@Override
 			public void onPacketSending(PacketEvent event) {
-				if (side.isForServer()) {
+				if (side.isForServer() && filter.filterEvent(event)) {
 					printInformation(event);
 				}
 			}
 			
 			@Override
 			public void onPacketReceiving(PacketEvent event) {
-				if (side.isForClient()) {
+				if (side.isForClient() && filter.filterEvent(event)) {
 					printInformation(event);
 				}
 			}

ProtocolLib/src/main/java/com/comphenix/protocol/CommandProtocol.java

@@ -24,6 +24,8 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.plugin.Plugin;
 
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.metrics.Updater;
 import com.comphenix.protocol.metrics.Updater.UpdateResult;
 import com.comphenix.protocol.metrics.Updater.UpdateType;
@@ -40,6 +42,10 @@ class CommandProtocol extends CommandBase {
 	 */
 	public static final String NAME = "protocol";
 	
+	public static final ReportType REPORT_HTTP_ERROR = new ReportType("Http error: %s");
+	public static final ReportType REPORT_CANNOT_CHECK_FOR_UPDATES = new ReportType("Cannot check updates for ProtocolLib.");
+	public static final ReportType REPORT_CANNOT_UPDATE_PLUGIN = new ReportType("Cannot update ProtocolLib.");
+	
 	private Plugin plugin;
 	private Updater updater;
 	private ProtocolConfig config;
@@ -77,9 +83,11 @@ class CommandProtocol extends CommandBase {
 					sender.sendMessage(ChatColor.BLUE + "[ProtocolLib] " + result.toString());
 				} catch (Exception e) {
 					if (isHttpError(e)) {
-						getReporter().reportWarning(this, "Http error: " + e.getCause().getMessage());
+						getReporter().reportWarning(this, 
+								Report.newBuilder(REPORT_HTTP_ERROR).messageParam(e.getCause().getMessage())
+						);
 					} else {
-						getReporter().reportDetailed(this, "Cannot check updates for ProtocolLib.", e, sender);
+						getReporter().reportDetailed(this, Report.newBuilder(REPORT_CANNOT_CHECK_FOR_UPDATES).error(e).callerParam(sender));
 					}
 				}
 			}
@@ -98,9 +106,11 @@ class CommandProtocol extends CommandBase {
 					sender.sendMessage(ChatColor.BLUE + "[ProtocolLib] " + result.toString());
 				} catch (Exception e) {
 					if (isHttpError(e)) {
-						getReporter().reportWarning(this, "Http error: " + e.getCause().getMessage());
+						getReporter().reportWarning(this, 
+								Report.newBuilder(REPORT_HTTP_ERROR).messageParam(e.getCause().getMessage())
+						);
 					} else {
-						getReporter().reportDetailed(this, "Cannot update ProtocolLib.", e, sender);
+						getReporter().reportDetailed(this,Report.newBuilder(REPORT_CANNOT_UPDATE_PLUGIN).error(e).callerParam(sender));
 					}
 				}
 			}

ProtocolLib/src/main/java/com/comphenix/protocol/MultipleLinesPrompt.java

@@ -0,0 +1,163 @@
+package com.comphenix.protocol;
+
+import org.bukkit.conversations.Conversation;
+import org.bukkit.conversations.ConversationCanceller;
+import org.bukkit.conversations.ConversationContext;
+import org.bukkit.conversations.ExactMatchConversationCanceller;
+import org.bukkit.conversations.Prompt;
+import org.bukkit.conversations.StringPrompt;
+
+/**
+ * Represents a conversation prompt that accepts a list of lines.
+ * 
+ * @author Kristian
+ */
+class MultipleLinesPrompt extends StringPrompt {
+	/**
+	 * Represents a canceller that determines if the multiple lines prompt is finished.
+	 * @author Kristian
+	 */
+	public static interface MultipleConversationCanceller extends ConversationCanceller {
+		@Override
+		public boolean cancelBasedOnInput(ConversationContext context, String currentLine);
+
+		/**
+		 * Determine if the current prompt is done based on the context, last
+		 * line and collected lines.
+		 * 
+		 * @param context - current context.
+		 * @param currentLine - current (last) line.
+		 * @param lines - collected lines.
+		 * @param lineCount - number of lines.
+		 * @return TRUE if we are done, FALSE otherwise.
+		 */
+		public boolean cancelBasedOnInput(ConversationContext context, String currentLine, 
+										  StringBuilder lines, int lineCount);
+	}
+
+	/**
+	 * A wrapper class for turning a ConversationCanceller into a MultipleConversationCanceller.
+	 * @author Kristian
+	 */
+	private static class MultipleWrapper implements MultipleConversationCanceller {
+		private ConversationCanceller canceller;
+
+		public MultipleWrapper(ConversationCanceller canceller) {
+			this.canceller = canceller;
+		}
+		
+		@Override
+		public boolean cancelBasedOnInput(ConversationContext context, String currentLine) {
+			return canceller.cancelBasedOnInput(context, currentLine);
+		}
+		
+		@Override
+		public boolean cancelBasedOnInput(ConversationContext context, String currentLine, 
+										  StringBuilder lines, int lineCount) {
+			return cancelBasedOnInput(context, currentLine);
+		}
+
+		@Override
+		public void setConversation(Conversation conversation) {
+			canceller.setConversation(conversation);
+		}
+		
+		@Override
+		public MultipleWrapper clone() {
+			return new MultipleWrapper(canceller.clone());
+		}
+	}
+
+	// Feels a bit like Android
+	private static final String KEY = "multiple_lines_prompt";
+	private static final String KEY_LAST = KEY + ".last_line";
+	private static final String KEY_LINES = KEY + ".linecount";
+
+	private final MultipleConversationCanceller endMarker;
+	private final String initialPrompt;
+
+	/**
+	 * Retrieve and remove the current accumulated input.
+	 * 
+	 * @param context
+	 *            - conversation context.
+	 * @return The accumulated input, or NULL if not found.
+	 */
+	public String removeAccumulatedInput(ConversationContext context) {
+		Object result = context.getSessionData(KEY);
+
+		if (result instanceof StringBuilder) {
+			context.setSessionData(KEY, null);
+			context.setSessionData(KEY_LINES, null);
+			return ((StringBuilder) result).toString();
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 * Construct a multiple lines input prompt with a specific end marker.
+	 * <p>
+	 * This is usually an empty string.
+	 * 
+	 * @param endMarker - the end marker.
+	 */
+	public MultipleLinesPrompt(String endMarker, String initialPrompt) {
+		this(new ExactMatchConversationCanceller(endMarker), initialPrompt);
+	}
+
+	/**
+	 * Construct a multiple lines input prompt with a specific end marker implementation.
+	 * <p>
+	 * Note: Use {@link #MultipleLinesPrompt(MultipleConversationCanceller, String)} if implementing a custom canceller.
+	 * @param endMarker - the end marker.
+	 * @param initialPrompt - the initial prompt text.
+	 */
+	public MultipleLinesPrompt(ConversationCanceller endMarker, String initialPrompt) {
+		this.endMarker = new MultipleWrapper(endMarker);
+		this.initialPrompt = initialPrompt;
+	}
+	
+	/**
+	 * Construct a multiple lines input prompt with a specific end marker implementation.
+	 * @param endMarker - the end marker.
+	 * @param initialPrompt - the initial prompt text.
+	 */
+	public MultipleLinesPrompt(MultipleConversationCanceller endMarker, String initialPrompt) {
+		this.endMarker = endMarker;
+		this.initialPrompt = initialPrompt;
+	}
+
+	@Override
+	public Prompt acceptInput(ConversationContext context, String in) {
+		StringBuilder result = (StringBuilder) context.getSessionData(KEY);
+		Integer count = (Integer) context.getSessionData(KEY_LINES);
+		
+		// Handle first run
+		if (result == null) 
+			context.setSessionData(KEY, result = new StringBuilder());
+		if (count == null)
+			count = 0;
+		
+		// Save the last line as well
+		context.setSessionData(KEY_LAST, in);
+		context.setSessionData(KEY_LINES, ++count);
+		result.append(in + "\n");
+
+		// And we're done
+		if (endMarker.cancelBasedOnInput(context, in, result, count))
+			return Prompt.END_OF_CONVERSATION;
+		else
+			return this;
+	}
+
+	@Override
+	public String getPromptText(ConversationContext context) {
+		Object last = context.getSessionData(KEY_LAST);
+
+		if (last instanceof String)
+			return (String) last;
+		else
+			return initialPrompt;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/PacketStream.java

@@ -21,6 +21,7 @@ import java.lang.reflect.InvocationTargetException;
 
 import org.bukkit.entity.Player;
 
+import com.comphenix.protocol.events.ListenerPriority;
 import com.comphenix.protocol.events.PacketContainer;
 
 /**
@@ -43,7 +44,7 @@ public interface PacketStream {
 	 * Send a packet to the given player.
 	 * @param reciever - the reciever.
 	 * @param packet - packet to send.
-	 * @param filters - whether or not to invoke any packet filters.
+	 * @param filters - whether or not to invoke any packet filters below {@link ListenerPriority#MONITOR}.
 	 * @throws InvocationTargetException - if an error occured when sending the packet.
 	 */
 	public void sendServerPacket(Player reciever, PacketContainer packet, boolean filters)
@@ -63,7 +64,7 @@ public interface PacketStream {
 	 * Simulate recieving a certain packet from a given player.
 	 * @param sender - the sender.
 	 * @param packet - the packet that was sent.
-	 * @param filters - whether or not to invoke any packet filters.
+	 * @param filters - whether or not to invoke any packet filters below {@link ListenerPriority#MONITOR}.
 	 * @throws InvocationTargetException If the reflection machinery failed.
 	 * @throws IllegalAccessException If the underlying method caused an error.
 	 */

ProtocolLib/src/main/java/com/comphenix/protocol/Packets.java

@@ -114,6 +114,10 @@ public final class Packets {
 		public static final int PLAYER_INFO = 201;
 		public static final int ABILITIES = 202;
 		public static final int TAB_COMPLETE = 203;
+		public static final int SCOREBOARD_OBJECTIVE = 206;
+		public static final int UPDATE_SCORE  = 207;
+		public static final int DISPLAY_SCOREBOARD = 208;
+		public static final int TEAMS = 209;
 		public static final int CUSTOM_PAYLOAD = 250;
 		public static final int KEY_RESPONSE = 252;
 		public static final int KEY_REQUEST = 253;

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolConfig.java

@@ -18,12 +18,15 @@
 package com.comphenix.protocol;
 
 import java.io.File;
+import java.io.IOException;
 
 import org.bukkit.configuration.Configuration;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.plugin.Plugin;
 
 import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
+import com.google.common.base.Charsets;
+import com.google.common.io.Files;
 
 /**
  * Represents the configuration of ProtocolLib.
@@ -31,6 +34,7 @@ import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
  * @author Kristian
  */
 class ProtocolConfig {
+	private static final String LAST_UPDATE_FILE = "lastupdate";
 	
 	private static final String SECTION_GLOBAL = "global";
 	private static final String SECTION_AUTOUPDATER = "auto updater";
@@ -40,12 +44,14 @@ class ProtocolConfig {
 	private static final String IGNORE_VERSION_CHECK = "ignore version check";	
 	private static final String BACKGROUND_COMPILER_ENABLED = "background compiler";
 
+	private static final String DEBUG_MODE_ENABLED = "debug";
 	private static final String INJECTION_METHOD = "injection method";
 	
+	private static final String SCRIPT_ENGINE_NAME = "script engine";
+	
 	private static final String UPDATER_NOTIFY = "notify";
 	private static final String UPDATER_DOWNLAD = "download";
 	private static final String UPDATER_DELAY = "delay";
-	private static final String UPDATER_LAST_TIME = "last";
 	
 	// Defaults
 	private static final long DEFAULT_UPDATER_DELAY = 43200;
@@ -57,6 +63,11 @@ class ProtocolConfig {
 	private ConfigurationSection global;
 	private ConfigurationSection updater;
 	
+	// Last update time
+	private long lastUpdateTime;
+	private boolean configChanged;
+	private boolean valuesChanged;
+	
 	public ProtocolConfig(Plugin plugin) {
 		this(plugin, plugin.getConfig());
 	}
@@ -70,10 +81,64 @@ class ProtocolConfig {
 	 * Reload configuration file.
 	 */
 	public void reloadConfig() {
+		// Reset
+		configChanged = false;
+		valuesChanged = false;
+		
 		this.config = plugin.getConfig();
+		this.lastUpdateTime = loadLastUpdate();
 		loadSections(!loadingSections);
 	}
 	
+	/**
+	 * Load the last update time stamp from the file system.
+	 * @return Last update time stamp.
+	 */
+	private long loadLastUpdate() {
+		File dataFile = getLastUpdateFile();
+		
+		if (dataFile.exists()) {
+			try {
+				return Long.parseLong(Files.toString(dataFile, Charsets.UTF_8));
+			} catch (NumberFormatException e) {
+				throw new RuntimeException("Cannot parse " + dataFile + " as a number.", e);
+			} catch (IOException e) {
+				throw new RuntimeException("Cannot read " + dataFile, e);
+			}
+		} else {
+			// Default last update
+			return 0;
+		}
+	}
+	
+	/**
+	 * Store the given time stamp.
+	 * @param value - time stamp to store.
+	 */
+	private void saveLastUpdate(long value) {
+		File dataFile = getLastUpdateFile();
+	
+		// The data folder must exist
+		dataFile.getParentFile().mkdirs();
+		
+		if (dataFile.exists())
+			dataFile.delete();
+		
+		try {
+			Files.write(Long.toString(value), dataFile, Charsets.UTF_8);
+		} catch (IOException e) {
+			throw new RuntimeException("Cannot write " + dataFile, e);
+		}
+	}
+	
+	/**
+	 * Retrieve the file that is used to store the update time stamp.
+	 * @return File storing the update time stamp.
+	 */
+	private File getLastUpdateFile() {
+		return new File(plugin.getDataFolder(), LAST_UPDATE_FILE);
+	}
+	
 	/**
 	 * Load data sections.
 	 * @param copyDefaults - whether or not to copy configuration defaults.
@@ -101,6 +166,17 @@ class ProtocolConfig {
 		}
 	}
 	
+	/**
+	 * Set a particular configuration key value pair.
+	 * @param section - the configuration root.
+	 * @param path - the path to the key.
+	 * @param value - the value to set.
+	 */
+	private void setConfig(ConfigurationSection section, String path, Object value) {
+		configChanged = true;
+		section.set(path, value);
+	}
+
 	/**
 	 * Retrieve a reference to the configuration file.
 	 * @return Configuration file on disk.
@@ -122,7 +198,7 @@ class ProtocolConfig {
 	 * @param value - TRUE to do this automatically, FALSE otherwise.
 	 */
 	public void setAutoNotify(boolean value) {
-		updater.set(UPDATER_NOTIFY, value);
+		setConfig(updater, UPDATER_NOTIFY, value);
 	}
 	
 	/**
@@ -138,7 +214,25 @@ class ProtocolConfig {
 	 * @param value - TRUE if it should. FALSE otherwise.
 	 */
 	public void setAutoDownload(boolean value) {
-		updater.set(UPDATER_DOWNLAD, value);
+		setConfig(updater, UPDATER_DOWNLAD, value);
+	}
+	
+	/**
+	 * Determine whether or not debug mode is enabled.
+	 * <p>
+	 * This grants access to the filter command.
+	 * @return TRUE if it is, FALSE otherwise.
+	 */
+	public boolean isDebug() {
+		return global.getBoolean(DEBUG_MODE_ENABLED, false);
+	}
+	
+	/**
+	 * Set whether or not debug mode is enabled.
+	 * @param value - TRUE if it is enabled, FALSE otherwise.
+	 */
+	public void setDebug(boolean value) {
+		setConfig(global, DEBUG_MODE_ENABLED, value);
 	}
 
 	/**
@@ -160,15 +254,7 @@ class ProtocolConfig {
 		// Silently fix the delay
 		if (delaySeconds < DEFAULT_UPDATER_DELAY)
 			delaySeconds = DEFAULT_UPDATER_DELAY;
-		updater.set(UPDATER_DELAY, delaySeconds);
+		setConfig(updater, UPDATER_DELAY, delaySeconds);
-	}
-	
-	/**
-	 * Retrieve the last time we updated, in seconds since 1970.01.01 00:00.
-	 * @return Last update time.
-	 */
-	public long getAutoLastTime() {
-		return updater.getLong(UPDATER_LAST_TIME, 0);
 	}
 	
 	/**
@@ -188,7 +274,7 @@ class ProtocolConfig {
 	 * @param ignoreVersion - the version of Minecraft where the satefy will be disabled.
 	 */
 	public void setIgnoreVersionCheck(String ignoreVersion) {
-		global.set(IGNORE_VERSION_CHECK, ignoreVersion);
+		setConfig(global, IGNORE_VERSION_CHECK, ignoreVersion);
 	}
 	
 	/**
@@ -207,7 +293,7 @@ class ProtocolConfig {
 	 * @param enabled - whether or not metrics is enabled.
 	 */
 	public void setMetricsEnabled(boolean enabled) {
-		global.set(METRICS_ENABLED, enabled);
+		setConfig(global, METRICS_ENABLED, enabled);
 	}
 	
 	/**
@@ -226,7 +312,15 @@ class ProtocolConfig {
 	 * @param enabled - TRUE if is enabled/running, FALSE otherwise.
 	 */
 	public void setBackgroundCompilerEnabled(boolean enabled) {
-		global.set(BACKGROUND_COMPILER_ENABLED, enabled);
+		setConfig(global, BACKGROUND_COMPILER_ENABLED, enabled);
+	}
+	
+	/**
+	 * Retrieve the last time we updated, in seconds since 1970.01.01 00:00.
+	 * @return Last update time.
+	 */
+	public long getAutoLastTime() {
+		return lastUpdateTime;
 	}
 
 	/**
@@ -234,7 +328,26 @@ class ProtocolConfig {
 	 * @param lastTimeSeconds - new last update time.
 	 */
 	public void setAutoLastTime(long lastTimeSeconds) { 
-		updater.set(UPDATER_LAST_TIME, lastTimeSeconds);
+		this.valuesChanged = true;
+		this.lastUpdateTime = lastTimeSeconds;
+	}
+	
+	/**
+	 * Retrieve the unique name of the script engine to use for filtering.
+	 * @return Script engine to use.
+	 */
+	public String getScriptEngineName() {
+		return global.getString(SCRIPT_ENGINE_NAME, "JavaScript");
+	}
+	
+	/**
+	 * Set the unique name of the script engine to use for filtering.
+	 * <p>
+	 * This setting will take effect next time ProtocolLib is started.
+	 * @param name - name of the script engine to use.
+	 */
+	public void setScriptEngineName(String name) {
+		setConfig(global, SCRIPT_ENGINE_NAME, name);
 	}
 	
 	/**
@@ -266,13 +379,20 @@ class ProtocolConfig {
 	 * @return Injection method.
 	 */
 	public void setInjectionMethod(PlayerInjectHooks hook) {
-		global.set(INJECTION_METHOD, hook.name());
+		setConfig(global, INJECTION_METHOD, hook.name());
 	}
 	
 	/**
 	 * Save the current configuration file.
 	 */
 	public void saveAll() {
+		if (valuesChanged)
+			saveLastUpdate(lastUpdateTime);
+		if (configChanged)
 			plugin.saveConfig();
+		
+		// And we're done
+		valuesChanged = false;
+		configChanged = false;
 	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolLibrary.java

@@ -33,8 +33,11 @@ import org.bukkit.plugin.PluginManager;
 import org.bukkit.plugin.java.JavaPlugin;
 
 import com.comphenix.protocol.async.AsyncFilterManager;
+import com.comphenix.protocol.error.BasicErrorReporter;
 import com.comphenix.protocol.error.DetailedErrorReporter;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.injector.DelayedSingleTask;
 import com.comphenix.protocol.injector.PacketFilterManager;
 import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
@@ -43,6 +46,7 @@ import com.comphenix.protocol.metrics.Updater;
 import com.comphenix.protocol.metrics.Updater.UpdateResult;
 import com.comphenix.protocol.reflect.compiler.BackgroundCompiler;
 import com.comphenix.protocol.utility.ChatExtensions;
+import com.comphenix.protocol.utility.MinecraftVersion;
 
 /**
  * The main entry point for ProtocolLib.
@@ -50,6 +54,24 @@ import com.comphenix.protocol.utility.ChatExtensions;
  * @author Kristian
  */
 public class ProtocolLibrary extends JavaPlugin {
+	// Every possible error or warning report type
+	public static final ReportType REPORT_CANNOT_LOAD_CONFIG = new ReportType("Cannot load configuration");
+	public static final ReportType REPORT_CANNOT_DELETE_CONFIG = new ReportType("Cannot delete old ProtocolLib configuration.");
+	public static final ReportType REPORT_CANNOT_PARSE_INJECTION_METHOD = new ReportType("Cannot parse injection method. Using default.");
+	
+	public static final ReportType REPORT_PLUGIN_LOAD_ERROR = new ReportType("Cannot load ProtocolLib.");
+	public static final ReportType REPORT_PLUGIN_ENABLE_ERROR = new ReportType("Cannot enable ProtocolLib.");
+	
+	public static final ReportType REPORT_METRICS_IO_ERROR = new ReportType("Unable to enable metrics due to network problems.");
+	public static final ReportType REPORT_METRICS_GENERIC_ERROR = new ReportType("Unable to enable metrics due to network problems.");
+	
+	public static final ReportType REPORT_CANNOT_PARSE_MINECRAFT_VERSION = new ReportType("Unable to retrieve current Minecraft version.");
+	public static final ReportType REPORT_CANNOT_DETECT_CONFLICTING_PLUGINS = new ReportType("Unable to detect conflicting plugin versions.");
+	public static final ReportType REPORT_CANNOT_REGISTER_COMMAND = new ReportType("Cannot register command %s: %s");
+	
+	public static final ReportType REPORT_CANNOT_CREATE_TIMEOUT_TASK = new ReportType("Unable to create packet timeout task.");
+	public static final ReportType REPORT_CANNOT_UPDATE_PLUGIN = new ReportType("Cannot perform automatic updates.");
+	
 	/**
 	 * The minimum version ProtocolLib has been tested with.
 	 */
@@ -58,7 +80,7 @@ public class ProtocolLibrary extends JavaPlugin {
 	/**
 	 * The maximum version ProtocolLib has been tested with,
 	 */
-	private static final String MAXIMUM_MINECRAFT_VERSION = "1.4.7";
+	private static final String MAXIMUM_MINECRAFT_VERSION = "1.5.2";
 	
 	/**
 	 * The number of milliseconds per second.
@@ -71,7 +93,7 @@ public class ProtocolLibrary extends JavaPlugin {
 	private static PacketFilterManager protocolManager;
 	
 	// Error reporter
-	private static ErrorReporter reporter;
+	private static ErrorReporter reporter = new BasicErrorReporter();
 	
 	// Metrics and statistisc
 	private Statistics statistisc;
@@ -102,6 +124,7 @@ public class ProtocolLibrary extends JavaPlugin {
 	// Commands
 	private CommandProtocol commandProtocol;
 	private CommandPacket commandPacket;
+	private CommandFilter commandFilter;
 	
 	// Whether or not disable is not needed
 	private boolean skipDisable;
@@ -118,26 +141,34 @@ public class ProtocolLibrary extends JavaPlugin {
 		try {
 			config = new ProtocolConfig(this);
 		} catch (Exception e) {
-			detailedReporter.reportWarning(this, "Cannot load configuration", e);
+			detailedReporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_LOAD_CONFIG).error(e));
 
 			// Load it again
 			if (deleteConfig()) {
 				config = new ProtocolConfig(this);
 			} else {
-				reporter.reportWarning(this, "Cannot delete old ProtocolLib configuration.");
+				reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_DELETE_CONFIG));
 			}
 		}
 		
+		// Print the state of the debug mode
+		if (config.isDebug()) {
+			logger.warning("Debug mode is enabled!");
+		}
+		
 		try {
 			// Check for other versions
 			checkConflictingVersions();
 			
+			// Handle unexpected Minecraft versions
+			MinecraftVersion version = verifyMinecraftVersion();
+			
 			// Set updater
 			updater = new Updater(this, logger, "protocollib", getFile(), "protocol.info");
 			
 			unhookTask = new DelayedSingleTask(this);
 			protocolManager = new PacketFilterManager(
-					getClassLoader(), getServer(), unhookTask, detailedReporter);
+					getClassLoader(), getServer(), this, version, unhookTask, detailedReporter);			
 			
 			// Setup error reporter
 			detailedReporter.addGlobalParameter("manager", protocolManager);
@@ -152,18 +183,19 @@ public class ProtocolLibrary extends JavaPlugin {
 					protocolManager.setPlayerHook(hook);
 				}
 			} catch (IllegalArgumentException e) {
-				detailedReporter.reportWarning(config, "Cannot parse injection method. Using default.", e);
+				detailedReporter.reportWarning(config, Report.newBuilder(REPORT_CANNOT_PARSE_INJECTION_METHOD).error(e));
 			}
 			
 			// Initialize command handlers
 			commandProtocol = new CommandProtocol(detailedReporter, this, updater, config);
-			commandPacket = new CommandPacket(detailedReporter, this, logger, protocolManager);
+			commandFilter = new CommandFilter(detailedReporter, this, config);
+			commandPacket = new CommandPacket(detailedReporter, this, logger, commandFilter, protocolManager);
 			
 			// Send logging information to player listeners too
 			setupBroadcastUsers(PERMISSION_INFO);
 			
 		} catch (Throwable e) {
-			detailedReporter.reportDetailed(this, "Cannot load ProtocolLib.", e, protocolManager);
+			detailedReporter.reportDetailed(this, Report.newBuilder(REPORT_PLUGIN_LOAD_ERROR).error(e).callerParam(protocolManager));
 			disablePlugin();
 		}
 	}
@@ -249,12 +281,10 @@ public class ProtocolLibrary extends JavaPlugin {
 				logger.info("Structure compiler thread has been disabled.");
 			}
 			
-			// Handle unexpected Minecraft versions
-			verifyMinecraftVersion();
-			
 			// Set up command handlers
 			registerCommand(CommandProtocol.NAME, commandProtocol);
 			registerCommand(CommandPacket.NAME, commandPacket);
+			registerCommand(CommandFilter.NAME, commandFilter);
 	
 			// Player login and logout events
 			protocolManager.registerEvents(manager, this);
@@ -264,7 +294,7 @@ public class ProtocolLibrary extends JavaPlugin {
 			createAsyncTask(server);
 		
 		} catch (Throwable e) {
-			reporter.reportDetailed(this, "Cannot enable ProtocolLib.", e);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_PLUGIN_ENABLE_ERROR).error(e));
 			disablePlugin();
 			return;
 		}
@@ -275,14 +305,14 @@ public class ProtocolLibrary extends JavaPlugin {
 				statistisc = new Statistics(this);
 			}
 		} catch (IOException e) {
-			reporter.reportDetailed(this, "Unable to enable metrics.", e, statistisc);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_METRICS_IO_ERROR).error(e).callerParam(statistisc));
 		} catch (Throwable e) {
-			reporter.reportDetailed(this, "Metrics cannot be enabled. Incompatible Bukkit version.", e, statistisc);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_METRICS_GENERIC_ERROR).error(e).callerParam(statistisc));
 		}
 	}
 	
 	// Used to check Minecraft version
-	private void verifyMinecraftVersion() {
+	private MinecraftVersion verifyMinecraftVersion() {
 		try {
 			MinecraftVersion minimum = new MinecraftVersion(MINIMUM_MINECRAFT_VERSION);
 			MinecraftVersion maximum = new MinecraftVersion(MAXIMUM_MINECRAFT_VERSION);
@@ -296,9 +326,14 @@ public class ProtocolLibrary extends JavaPlugin {
 				if (current.compareTo(maximum) > 0)
 					logger.warning("Version " + current + " has not yet been tested! Proceed with caution.");
 	 		}
+			return current;
+			
 		} catch (Exception e) {
-			reporter.reportWarning(this, "Unable to retrieve current Minecraft version.", e);
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_PARSE_MINECRAFT_VERSION).error(e));
 		}
+		
+		// Unknown version
+		return null;
 	}
 	
 	private void checkConflictingVersions() {
@@ -331,7 +366,7 @@ public class ProtocolLibrary extends JavaPlugin {
 			}
 
 		} catch (Exception e) {
-			reporter.reportWarning(this, "Unable to detect conflicting plugin versions.", e);
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_DETECT_CONFLICTING_PLUGINS).error(e));
 		}
 		
 		// See if the newest version is actually higher
@@ -360,7 +395,9 @@ public class ProtocolLibrary extends JavaPlugin {
 				throw new RuntimeException("plugin.yml might be corrupt.");
 		
 		} catch (RuntimeException e) {
-			reporter.reportWarning(this, "Cannot register command " + name + ": " + e.getMessage());
+			reporter.reportWarning(this, 
+					Report.newBuilder(REPORT_CANNOT_REGISTER_COMMAND).messageParam(name, e.getMessage()).error(e)
+			);
 		}
 	}
 	
@@ -394,7 +431,7 @@ public class ProtocolLibrary extends JavaPlugin {
 		
 		} catch (Throwable e) {
 			if (asyncPacketTask == -1) {
-				reporter.reportDetailed(this, "Unable to create packet timeout task.", e);
+				reporter.reportDetailed(this, Report.newBuilder(REPORT_CANNOT_CREATE_TIMEOUT_TASK).error(e));
 			}
 		}
 	}
@@ -417,7 +454,7 @@ public class ProtocolLibrary extends JavaPlugin {
 					commandProtocol.updateFinished();
 			}
 		} catch (Exception e) {
-			reporter.reportDetailed(this, "Cannot perform automatic updates.", e);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_CANNOT_UPDATE_PLUGIN).error(e));
 			updateDisabled = true;
 		}
 	}
@@ -454,7 +491,9 @@ public class ProtocolLibrary extends JavaPlugin {
 			unhookTask.close();
 		protocolManager = null;
 		statistisc = null;
-		reporter = null;
+
+		// To clean up global parameters
+		reporter = new BasicErrorReporter();
 		
 		// Leaky ClassLoader begone!
 		if (updater == null || updater.getResult() != UpdateResult.SUCCESS) {
@@ -479,6 +518,8 @@ public class ProtocolLibrary extends JavaPlugin {
 	
 	/**
 	 * Retrieve the current error reporter.
+	 * <p>
+	 * This is guaranteed to not be NULL in 2.5.0 and later.
 	 * @return Current error reporter.
 	 */
 	public static ErrorReporter getErrorReporter() {

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolManager.java

@@ -27,6 +27,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
 
 import com.comphenix.protocol.async.AsyncMarker;
+import com.comphenix.protocol.events.ListenerPriority;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketListener;
 import com.comphenix.protocol.injector.PacketConstructor;
@@ -47,7 +48,7 @@ public interface ProtocolManager extends PacketStream {
 	 * 
 	 * @param reciever - the reciever.
 	 * @param packet - packet to send.
-	 * @param filters - whether or not to invoke any packet filters.
+	 * @param filters - whether or not to invoke any packet filters below {@link ListenerPriority#MONITOR}.
 	 * @throws InvocationTargetException - if an error occured when sending the packet.
 	 */
 	@Override
@@ -62,7 +63,7 @@ public interface ProtocolManager extends PacketStream {
 	 * 
 	 * @param sender - the sender.
 	 * @param packet - the packet that was sent.
-	 * @param filters - whether or not to invoke any packet filters.
+	 * @param filters - whether or not to invoke any packet filters below {@link ListenerPriority#MONITOR}.
 	 * @throws InvocationTargetException If the reflection machinery failed.
 	 * @throws IllegalAccessException If the underlying method caused an error.
 	 */

ProtocolLib/src/main/java/com/comphenix/protocol/async/PacketProcessingQueue.java

@@ -23,6 +23,7 @@ import java.util.PriorityQueue;
 import java.util.Queue;
 import java.util.concurrent.Semaphore;
 
+import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.concurrency.AbstractConcurrentListenerMultimap;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.injector.PrioritizedListener;
@@ -66,7 +67,7 @@ class PacketProcessingQueue extends AbstractConcurrentListenerMultimap<AsyncList
 	}
 	
 	public PacketProcessingQueue(PlayerSendingHandler sendingHandler, int initialSize, int maximumSize, int maximumConcurrency) {
-		super();
+		super(Packets.MAXIMUM_PACKET_ID);
 
 		try {
 			this.processingQueue = Synchronization.queue(MinMaxPriorityQueue.

ProtocolLib/src/main/java/com/comphenix/protocol/async/PacketSendingQueue.java

@@ -89,6 +89,7 @@ abstract class PacketSendingQueue {
 			PacketEvent copy = PacketEvent.fromSynchronous(packetUpdated, marker);
 			
 			// "Cancel" the original event
+			packetUpdated.setReadOnly(false);
 			packetUpdated.setCancelled(true);
 			
 			// Enqueue the copy with the new sending index

ProtocolLib/src/main/java/com/comphenix/protocol/concurrency/AbstractConcurrentListenerMultimap.java

@@ -23,6 +23,7 @@ import java.util.List;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicReferenceArray;
 
 import com.comphenix.protocol.events.ListeningWhitelist;
 import com.comphenix.protocol.injector.PrioritizedListener;
@@ -34,10 +35,14 @@ import com.google.common.collect.Iterables;
  * @author Kristian
  */
 public abstract class AbstractConcurrentListenerMultimap<TListener> {
-
 	// The core of our map
-	private ConcurrentMap<Integer, SortedCopyOnWriteArray<PrioritizedListener<TListener>>> listeners = 
+	private AtomicReferenceArray<SortedCopyOnWriteArray<PrioritizedListener<TListener>>> arrayListeners;
-		new ConcurrentHashMap<Integer, SortedCopyOnWriteArray<PrioritizedListener<TListener>>>();
+	private ConcurrentMap<Integer, SortedCopyOnWriteArray<PrioritizedListener<TListener>>> mapListeners;
+	
+	public AbstractConcurrentListenerMultimap(int maximumPacketID) {
+		arrayListeners = new AtomicReferenceArray<SortedCopyOnWriteArray<PrioritizedListener<TListener>>>(maximumPacketID + 1);
+		mapListeners =   new ConcurrentHashMap<Integer, SortedCopyOnWriteArray<PrioritizedListener<TListener>>>();
+	}
 	
 	/**
 	 * Adds a listener to its requested list of packet recievers.
@@ -45,7 +50,6 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 	 * @param whitelist - the packet whitelist to use.
 	 */
 	public void addListener(TListener listener, ListeningWhitelist whitelist) {
-		
 		PrioritizedListener<TListener> prioritized = new PrioritizedListener<TListener>(listener, whitelist.getPriority());
 		
 		for (Integer packetID : whitelist.getWhitelist()) {
@@ -55,8 +59,7 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 	
 	// Add the listener to a specific packet notifcation list
 	private void addListener(Integer packetID, PrioritizedListener<TListener> listener) {
-		
+		SortedCopyOnWriteArray<PrioritizedListener<TListener>> list = arrayListeners.get(packetID);
-		SortedCopyOnWriteArray<PrioritizedListener<TListener>> list = listeners.get(packetID);
 		
 		// We don't want to create this for every lookup
 		if (list == null) {
@@ -64,12 +67,12 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 			// which is a essential feature for our purposes.
 			final SortedCopyOnWriteArray<PrioritizedListener<TListener>> value = new SortedCopyOnWriteArray<PrioritizedListener<TListener>>();
 
-			list = listeners.putIfAbsent(packetID, value);
+			// We may end up creating multiple multisets, but we'll agree on which to use
-			
+			if (arrayListeners.compareAndSet(packetID, null, value)) {
-			// We may end up creating multiple multisets, but we'll agree 
+				mapListeners.put(packetID, value);
-			// on the one to use.
-			if (list == null) {
 				list = value;
+			} else {
+				list = arrayListeners.get(packetID);
 			}
 		}
 		
@@ -84,13 +87,11 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 	 * @return Every packet ID that was removed due to no listeners.
 	 */
 	public List<Integer> removeListener(TListener listener, ListeningWhitelist whitelist) {
-	
 		List<Integer> removedPackets = new ArrayList<Integer>();
 		
 		// Again, not terribly efficient. But adding or removing listeners should be a rare event.
 		for (Integer packetID : whitelist.getWhitelist()) {
-			
+			SortedCopyOnWriteArray<PrioritizedListener<TListener>> list = arrayListeners.get(packetID);
-			SortedCopyOnWriteArray<PrioritizedListener<TListener>> list = listeners.get(packetID);
 			
 			// Remove any listeners
 			if (list != null) {
@@ -100,7 +101,8 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 					list.remove(new PrioritizedListener<TListener>(listener, whitelist.getPriority()));
 					
 					if (list.size() == 0) {
-						listeners.remove(packetID);
+						arrayListeners.set(packetID, null);
+						mapListeners.remove(packetID);
 						removedPackets.add(packetID);
 					}
 				}
@@ -120,7 +122,7 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 	 * @return Registered listeners.
 	 */
 	public Collection<PrioritizedListener<TListener>> getListener(int packetID) {
-		return listeners.get(packetID);
+		return arrayListeners.get(packetID);
 	}
 	
 	/**
@@ -128,7 +130,7 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 	 * @return Every listener.
 	 */
 	public Iterable<PrioritizedListener<TListener>> values() {
-		return Iterables.concat(listeners.values());
+		return Iterables.concat(mapListeners.values());
 	}
 	
 	/**
@@ -136,13 +138,15 @@ public abstract class AbstractConcurrentListenerMultimap<TListener> {
 	 * @return Registered packet ID.
 	 */
 	public Set<Integer> keySet() {
-		return listeners.keySet();
+		return mapListeners.keySet();
 	}
 	
 	/**
 	 * Remove all packet listeners.
 	 */
 	protected void clearListeners() {
-		listeners.clear();
+		arrayListeners = new AtomicReferenceArray<
+				SortedCopyOnWriteArray<PrioritizedListener<TListener>>>(arrayListeners.length());
+		mapListeners.clear();
 	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/concurrency/IntegerSet.java

@@ -18,6 +18,7 @@
 package com.comphenix.protocol.concurrency;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -60,6 +61,16 @@ public class IntegerSet {
 		array[element] = true;
 	}
 	
+	/**
+	 * Add the given collection of elements to the set.
+	 * @param packets - elements to add.
+	 */
+	public void addAll(Collection<Integer> packets) {
+		for (Integer id : packets) {
+			add(id);
+		}
+	}
+	
 	/**
 	 * Remove the given element from the set, or do nothing if it's already removed.
 	 * @param element - element to remove.

ProtocolLib/src/main/java/com/comphenix/protocol/error/BasicErrorReporter.java

@@ -0,0 +1,96 @@
+package com.comphenix.protocol.error;
+
+import java.io.PrintStream;
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.error.Report.ReportBuilder;
+import com.comphenix.protocol.reflect.PrettyPrinter;
+
+/**
+ * Represents a basic error reporter that prints error reports to the standard error stream.
+ * <p>
+ * Note that this implementation doesn't distinguish between {@link #reportWarning(Object, Report)} 
+ * and {@link #reportDetailed(Object, Report)} - they both have the exact same behavior.
+ * @author Kristian
+ */
+public class BasicErrorReporter implements ErrorReporter {
+	private final PrintStream output;
+	
+	/**
+	 * Construct a new basic error reporter that prints directly the standard error stream.
+	 */
+	public BasicErrorReporter() {
+		 this(System.err);
+	}
+	
+	/**
+	 * Construct a error reporter that prints to the given output stream.
+	 * @param output - the output stream.
+	 */
+	public BasicErrorReporter(PrintStream output) {
+		this.output = output;
+	}
+
+	@Override
+	public void reportMinimal(Plugin sender, String methodName, Throwable error) {
+		output.println("Unhandled exception occured in " +  methodName + " for " + sender.getName());
+		error.printStackTrace(output);
+	}
+
+	@Override
+	public void reportMinimal(Plugin sender, String methodName, Throwable error, Object... parameters) {
+		reportMinimal(sender, methodName, error);
+		
+		// Also print parameters
+		printParameters(parameters);
+	}
+
+	@Override
+	public void reportWarning(Object sender, Report report) {
+		// Basic warning
+		output.println("[" + sender.getClass().getSimpleName() + "] " + report.getReportMessage());
+		
+		if (report.getException() != null) {
+			report.getException().printStackTrace(output);
+		}
+		printParameters(report.getCallerParameters());
+	}
+
+	@Override
+	public void reportWarning(Object sender, ReportBuilder reportBuilder) {
+		reportWarning(sender, reportBuilder.build());
+	}
+
+	@Override
+	public void reportDetailed(Object sender, Report report) {
+		// No difference from warning
+		reportWarning(sender, report);
+	}
+
+	@Override
+	public void reportDetailed(Object sender, ReportBuilder reportBuilder) {
+		reportWarning(sender, reportBuilder);
+	}
+	
+	/**
+	 * Print the given parameters to the standard error stream.
+	 * @param parameters - the output parameters.
+	 */
+	private void printParameters(Object[] parameters) {
+		if (parameters != null && parameters.length > 0) {
+			output.println("Parameters: ");
+			
+			try {
+				for (Object parameter : parameters) {
+					if (parameter == null)
+						output.println("[NULL]");
+					else
+						output.println(PrettyPrinter.printObject(parameter));
+				}
+			} catch (IllegalAccessException e) {
+				// Damn it
+				e.printStackTrace();
+			}
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/error/DelegatedErrorReporter.java

@@ -0,0 +1,80 @@
+package com.comphenix.protocol.error;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.error.Report.ReportBuilder;
+
+/**
+ * Construct an error reporter that delegates to another error reporter.
+ * @author Kristian
+ */
+public class DelegatedErrorReporter implements ErrorReporter {
+	private final ErrorReporter delegated;
+
+	/**
+	 * Construct a new error reporter that forwards all reports to a given reporter.
+	 * @param delegated - the delegated reporter.
+	 */
+	public DelegatedErrorReporter(ErrorReporter delegated) {
+		this.delegated = delegated;
+	}
+	
+	/**
+	 * Retrieve the underlying error reporter.
+	 * @return Underlying error reporter.
+	 */
+	public ErrorReporter getDelegated() {
+		return delegated;
+	}
+
+	@Override
+	public void reportMinimal(Plugin sender, String methodName, Throwable error) {
+		delegated.reportMinimal(sender, methodName, error);
+	}
+
+	@Override
+	public void reportMinimal(Plugin sender, String methodName, Throwable error, Object... parameters) {
+		delegated.reportMinimal(sender, methodName, error, parameters);
+	}
+
+	@Override
+	public void reportWarning(Object sender, Report report) {
+		Report transformed = filterReport(sender, report, false);
+		
+		if (transformed != null) {
+			delegated.reportWarning(sender, transformed);
+		}
+	}
+
+	@Override
+	public void reportDetailed(Object sender, Report report) {
+		Report transformed = filterReport(sender, report, true);
+		
+		if (transformed != null) {
+			delegated.reportDetailed(sender, transformed);
+		}
+	}
+
+	/**
+	 * Invoked before an error report is passed on to the underlying error reporter.
+	 * <p>
+	 * To cancel a report, return NULL.
+	 * @param sender - the sender component.
+	 * @param report - the error report.
+	 * @param detailed - whether or not the report will be displayed in detail.
+	 * @return The report to pass on, or NULL to cancel it.
+	 */
+	protected Report filterReport(Object sender, Report report, boolean detailed) {
+		return report;
+	}
+	
+	@Override
+	public void reportWarning(Object sender, ReportBuilder reportBuilder) {
+		reportWarning(sender, reportBuilder.build());
+	}
+	
+	@Override
+	public void reportDetailed(Object sender, ReportBuilder reportBuilder) {
+		reportDetailed(sender, reportBuilder.build());
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/error/DetailedErrorReporter.java

@@ -34,6 +34,7 @@ import org.apache.commons.lang.builder.ToStringStyle;
 import org.bukkit.Bukkit;
 import org.bukkit.plugin.Plugin;
 
+import com.comphenix.protocol.error.Report.ReportBuilder;
 import com.comphenix.protocol.events.PacketAdapter;
 import com.comphenix.protocol.reflect.PrettyPrinter;
 import com.google.common.primitives.Primitives;
@@ -44,11 +45,14 @@ import com.google.common.primitives.Primitives;
  * @author Kristian
  */
 public class DetailedErrorReporter implements ErrorReporter {
+	/**
+	 * Report format for printing the current exception count. 
+	 */
+	public static final ReportType REPORT_EXCEPTION_COUNT = new ReportType("Internal exception count: %s!");
 	
 	public static final String SECOND_LEVEL_PREFIX = "  ";
 	public static final String DEFAULT_PREFIX = "  ";
 	public static final String DEFAULT_SUPPORT_URL = "http://dev.bukkit.org/server-mods/protocollib/";
-	public static final String PLUGIN_NAME = "ProtocolLib";
 
 	// Users that are informed about errors in the chat
 	public static final String ERROR_PERMISSION = "protocol.info";
@@ -68,6 +72,7 @@ public class DetailedErrorReporter implements ErrorReporter {
 	protected Logger logger;
 	
 	protected WeakReference<Plugin> pluginReference;
+	protected String pluginName;
 	
 	// Whether or not Apache Commons is not present
 	protected boolean apacheCommonsMissing;
@@ -92,15 +97,6 @@ public class DetailedErrorReporter implements ErrorReporter {
 		this(plugin, prefix, supportURL, DEFAULT_MAX_ERROR_COUNT, getBukkitLogger());
 	}
 
-	// Attempt to get the logger.
-	private static Logger getBukkitLogger() {
-		try {
-			return Bukkit.getLogger();
-		} catch (Throwable e) {
-			return Logger.getLogger("Minecraft");
-		}
-	}
-
 	/**
 	 * Create a central error reporting system.
 	 * @param plugin - the plugin owner.
@@ -114,23 +110,28 @@ public class DetailedErrorReporter implements ErrorReporter {
 			throw new IllegalArgumentException("Plugin cannot be NULL.");
 		
 		this.pluginReference = new WeakReference<Plugin>(plugin);
+		this.pluginName = plugin.getName();
 		this.prefix = prefix;
 		this.supportURL = supportURL;
 		this.maxErrorCount = maxErrorCount;
 		this.logger = logger;
 	}
 
+	// Attempt to get the logger.
+	private static Logger getBukkitLogger() {
+		try {
+			return Bukkit.getLogger();
+		} catch (Throwable e) {
+			return Logger.getLogger("Minecraft");
+		}
+	}
+
 	@Override
 	public void reportMinimal(Plugin sender, String methodName, Throwable error, Object... parameters) {
 		if (reportMinimalNoSpam(sender, methodName, error)) {
 			// Print parameters, if they are given
 			if (parameters != null && parameters.length > 0) {
-				logger.log(Level.SEVERE, "  Parameters:");
+				logger.log(Level.SEVERE, printParameters(parameters));
-				
-				// Print each parameter
-				for (Object parameter : parameters) {
-					logger.log(Level.SEVERE, "    " + getStringDescription(parameter));
-				}
 			}
 		}
 	}
@@ -140,6 +141,13 @@ public class DetailedErrorReporter implements ErrorReporter {
 		reportMinimalNoSpam(sender, methodName, error);
 	}
 	
+	/**
+	 * Report a problem with a given method and plugin, ensuring that we don't exceed the maximum number of error reports.
+	 * @param sender - the component that observed this exception.
+	 * @param methodName - the method name.
+	 * @param error - the error itself.
+	 * @return TRUE if the error was printed, FALSE if it was suppressed.
+	 */
 	public boolean reportMinimalNoSpam(Plugin sender, String methodName, Throwable error) {
 		String pluginName = PacketAdapter.getPluginName(sender);
 		AtomicInteger counter = warningCount.get(pluginName);
@@ -158,14 +166,14 @@ public class DetailedErrorReporter implements ErrorReporter {
 		
 		// See if we should print the full error
 		if (errorCount < getMaxErrorCount()) {
-			logger.log(Level.SEVERE, "[" + PLUGIN_NAME + "] Unhandled exception occured in " +
+			logger.log(Level.SEVERE, "[" + pluginName + "] Unhandled exception occured in " +
 					 methodName + " for " + pluginName, error);
 			return true;
 			
 		} else {
 			// Nope - only print the error count occationally
 			if (isPowerOfTwo(errorCount)) {
-				logger.log(Level.SEVERE, "[" + PLUGIN_NAME + "] Unhandled exception number " + errorCount + " occured in " +
+				logger.log(Level.SEVERE, "[" + pluginName + "] Unhandled exception number " + errorCount + " occured in " +
 						 methodName + " for " + pluginName, error);
 			}
 			return false;
@@ -184,15 +192,36 @@ public class DetailedErrorReporter implements ErrorReporter {
 	}
 	
 	@Override
-	public void reportWarning(Object sender, String message) {
+	public void reportWarning(Object sender, ReportBuilder reportBuilder) {
-		logger.log(Level.WARNING, "[" + PLUGIN_NAME + "] [" + getSenderName(sender) + "] " + message);
+		if (reportBuilder == null)
+			throw new IllegalArgumentException("reportBuilder cannot be NULL.");
+		
+		reportWarning(sender, reportBuilder.build());
 	}
 	
 	@Override
-	public void reportWarning(Object sender, String message, Throwable error) {
+	public void reportWarning(Object sender, Report report) {
-		logger.log(Level.WARNING, "[" + PLUGIN_NAME + "] [" + getSenderName(sender) + "] " + message, error);
+		String message = "[" + pluginName + "] [" + getSenderName(sender) + "] " + report.getReportMessage();
+		
+		// Print the main warning
+		if (report.getException() != null) {
+			logger.log(Level.WARNING, message, report.getException());
+		} else {
+			logger.log(Level.WARNING, message);
 		}
 		
+		// Parameters?
+		if (report.hasCallerParameters()) {
+			// Write it
+			logger.log(Level.WARNING, printParameters(report.getCallerParameters()));
+		}
+	}
+	
+	/**
+	 * Retrieve the name of a sender class.
+	 * @param sender - sender object.
+	 * @return The name of the sender's class.
+	 */
 	private String getSenderName(Object sender) {
 		if (sender != null)
 			return sender.getClass().getSimpleName();
@@ -201,8 +230,12 @@ public class DetailedErrorReporter implements ErrorReporter {
 	}
 	
 	@Override
-	public void reportDetailed(Object sender, String message, Throwable error, Object... parameters) {
+	public void reportDetailed(Object sender, ReportBuilder reportBuilder) {
+		reportDetailed(sender, reportBuilder.build());
+	}
 	
+	@Override
+	public void reportDetailed(Object sender, Report report) {
 		final Plugin plugin = pluginReference.get();
 		final int errorCount = internalErrorCount.incrementAndGet();
 		
@@ -211,7 +244,7 @@ public class DetailedErrorReporter implements ErrorReporter {
 			// Only allow the error count at rare occations
 			if (isPowerOfTwo(errorCount)) {
 				// Permit it - but print the number of exceptions first
-				reportWarning(this, "Internal exception count: " + errorCount + "!");
+				reportWarning(this, Report.newBuilder(REPORT_EXCEPTION_COUNT).messageParam(errorCount).build());
 			} else {
 				// NEVER SPAM THE CONSOLE
 				return;
@@ -222,27 +255,23 @@ public class DetailedErrorReporter implements ErrorReporter {
 		PrintWriter writer = new PrintWriter(text);
 
 		// Helpful message
-		writer.println("[ProtocolLib] INTERNAL ERROR: " + message);
+		writer.println("[" + pluginName + "] INTERNAL ERROR: " + report.getReportMessage());
 	    writer.println("If this problem hasn't already been reported, please open a ticket");
 	    writer.println("at " + supportURL + " with the following data:");
 	    
 	    // Now, let us print important exception information
 		writer.println("          ===== STACK TRACE =====");
 
-		if (error != null) 
+		if (report.getException() != null) {
-			error.printStackTrace(writer);
+			report.getException().printStackTrace(writer);
+		}
 		
 		// Data dump!
 		writer.println("          ===== DUMP =====");
 		
 		// Relevant parameters
-		if (parameters != null && parameters.length > 0) {
+		if (report.hasCallerParameters()) {
-			writer.println("Parameters:");
+			printParameters(writer, report.getCallerParameters());
-			
-			// We *really* want to get as much information as possible
-			for (Object param : parameters) {
-				writer.println(addPrefix(getStringDescription(param), SECOND_LEVEL_PREFIX));
-			}
 		}
 		
 		// Global parameters
@@ -270,7 +299,7 @@ public class DetailedErrorReporter implements ErrorReporter {
 			// Inform of this occurrence
 			if (ERROR_PERMISSION != null) {	
 				Bukkit.getServer().broadcast(
-						String.format("Error %s (%s) occured in %s.", message, error, sender),
+						String.format("Error %s (%s) occured in %s.", report.getReportMessage(), report.getException(), sender),
 						ERROR_PERMISSION
 				);
 			}
@@ -280,6 +309,23 @@ public class DetailedErrorReporter implements ErrorReporter {
 		logger.severe(addPrefix(text.toString(), prefix));
 	}
 	
+	private String printParameters(Object... parameters) {
+		StringWriter writer = new StringWriter();
+		
+		// Print and retrieve the string buffer
+		printParameters(new PrintWriter(writer), parameters);
+		return writer.toString();
+	}
+
+	private void printParameters(PrintWriter writer, Object[] parameters) {
+		writer.println("Parameters: ");
+		
+		// We *really* want to get as much information as possible
+		for (Object param : parameters) {
+			writer.println(addPrefix(getStringDescription(param), SECOND_LEVEL_PREFIX));
+		}
+	}
+	
 	/**
 	 * Adds the given prefix to every line in the text.
 	 * @param text - text to modify.
@@ -290,8 +336,12 @@ public class DetailedErrorReporter implements ErrorReporter {
 		return text.replaceAll("(?m)^", prefix);
 	}
 	
+	/**
+	 * Retrieve a string representation of the given object.
+	 * @param value - object to convert.
+	 * @return String representation.
+	 */
 	protected String getStringDescription(Object value) {
-		
 		// We can't only rely on toString.
 		if (value == null) {
 			return "[NULL]";
@@ -324,63 +374,125 @@ public class DetailedErrorReporter implements ErrorReporter {
 		return test instanceof String || Primitives.isWrapperType(test.getClass());
 	}
 	
+	/**
+	 * Retrieve the current number of errors printed through {@link #reportDetailed(Object, Report)}.
+	 * @return Number of errors printed.
+	 */
 	public int getErrorCount() {
 		return internalErrorCount.get();
 	}
 
+	/**
+	 * Set the number of errors printed.
+	 * @param errorCount - new number of errors printed.
+	 */
 	public void setErrorCount(int errorCount) {
 		internalErrorCount.set(errorCount);
 	}
 
+	/**
+	 * Retrieve the maximum number of errors we can print before we begin suppressing errors.
+	 * @return Maximum number of errors.
+	 */
 	public int getMaxErrorCount() {
 		return maxErrorCount;
 	}
 
+	/**
+	 * Set the maximum number of errors we can print before we begin suppressing errors.
+	 * @param maxErrorCount - new max count.
+	 */
 	public void setMaxErrorCount(int maxErrorCount) {
 		this.maxErrorCount = maxErrorCount;
 	}
 	
 	/**
 	 * Adds the given global parameter. It will be included in every error report.
+	 * <p>
+	 * Both key and value must be non-null.
 	 * @param key - name of parameter.
 	 * @param value - the global parameter itself.
 	 */
 	public void addGlobalParameter(String key, Object value) {
+		if (key == null)
+			throw new IllegalArgumentException("key cannot be NULL.");
+		if (value == null)
+			throw new IllegalArgumentException("value cannot be NULL.");
+		
 		globalParameters.put(key, value);
 	}
 	
+	/**
+	 * Retrieve a global parameter by its key.
+	 * @param key - key of the parameter to retrieve.
+	 * @return The value of the global parameter, or NULL if not found.
+	 */
 	public Object getGlobalParameter(String key) {
+		if (key == null)
+			throw new IllegalArgumentException("key cannot be NULL.");
+		
 		return globalParameters.get(key);
 	}
 	
+	/**
+	 * Reset all global parameters.
+	 */
 	public void clearGlobalParameters() {
 		globalParameters.clear();
 	}
 	
+	/**
+	 * Retrieve a set of every registered global parameter.
+	 * @return Set of all registered global parameters.
+	 */
 	public Set<String> globalParameters() {
 		return globalParameters.keySet();
 	}
 	
+	/**
+	 * Retrieve the support URL that will be added to all detailed reports.
+	 * @return Support URL.
+	 */
 	public String getSupportURL() {
 		return supportURL;
 	}
 
+	/**
+	 * Set the support URL that will be added to all detailed reports.
+	 * @param supportURL - the new support URL.
+	 */
 	public void setSupportURL(String supportURL) {
 		this.supportURL = supportURL;
 	}
 	
+	/**
+	 * Retrieve the prefix to apply to every line in the error reports.
+	 * @return Error report prefix.
+	 */
 	public String getPrefix() {
 		return prefix;
 	}
 
+	/**
+	 * Set the prefix to apply to every line in the error reports.
+	 * @param prefix - new prefix.
+	 */
 	public void setPrefix(String prefix) {
 		this.prefix = prefix;
 	}
 	
+	/**
+	 * Retrieve the current logger that is used to print all reports.
+	 * @return The current logger.
+	 */
 	public Logger getLogger() {
 		return logger;
 	}
 
+	/**
+	 * Set the current logger that is used to print all reports.
+	 * @param logger - new logger.
+	 */
 	public void setLogger(Logger logger) {
 		this.logger = logger;
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/error/ErrorReporter.java

@@ -19,10 +19,16 @@ package com.comphenix.protocol.error;
 
 import org.bukkit.plugin.Plugin;
 
-public interface ErrorReporter {
+import com.comphenix.protocol.error.Report.ReportBuilder;
 
+/**
+ * Represents an object that can forward an error {@link Report} to the display and permanent storage.
+ * 
+ * @author Kristian
+ */
+public interface ErrorReporter {
 	/**
-	 * Prints a small minimal error report about an exception from another plugin.
+	 * Prints a small minimal error report regarding an exception from another plugin.
 	 * @param sender - the other plugin.
 	 * @param methodName - name of the caller method.
 	 * @param error - the exception itself.
@@ -30,7 +36,7 @@ public interface ErrorReporter {
 	public abstract void reportMinimal(Plugin sender, String methodName, Throwable error);
 
 	/**
-	 * Prints a small minimal error report about an exception from another plugin.
+	 * Prints a small minimal error report regarding an exception from another plugin.
 	 * @param sender - the other plugin.
 	 * @param methodName - name of the caller method.
 	 * @param error - the exception itself.
@@ -41,25 +47,28 @@ public interface ErrorReporter {
 	/**
 	 * Prints a warning message from the current plugin.
 	 * @param sender - the object containing the caller method. 
-	 * @param message - error message. 
+	 * @param report - an error report to include.
 	 */
-	public abstract void reportWarning(Object sender, String message);
+	public abstract void reportWarning(Object sender, Report report);
 	
 	/**
 	 * Prints a warning message from the current plugin.
 	 * @param sender - the object containing the caller method. 
-	 * @param message - error message. 
+	 * @param reportBuilder - an error report builder that will be used to get the report.
-	 * @param error - the exception that was thrown.
 	 */
-	public abstract void reportWarning(Object sender, String message, Throwable error);
+	public abstract void reportWarning(Object sender, ReportBuilder reportBuilder);
 
 	/**
 	 * Prints a detailed error report about an unhandled exception.
 	 * @param sender - the object containing the caller method.
-	 * @param message - an error message to include.
+	 * @param report - an error report to include.
-	 * @param error - the exception that was thrown in the caller method.
-	 * @param parameters - parameters from the caller method.
 	 */
-	public abstract void reportDetailed(Object sender, String message, Throwable error, Object... parameters);
+	public abstract void reportDetailed(Object sender, Report report);
 	
+	/**
+	 * Prints a detailed error report about an unhandled exception.
+	 * @param sender - the object containing the caller method.
+	 * @param reportBuilder - an error report builder that will be used to get the report.
+	 */
+	public abstract void reportDetailed(Object sender, ReportBuilder reportBuilder);
 }

ProtocolLib/src/main/java/com/comphenix/protocol/error/Report.java

@@ -0,0 +1,162 @@
+package com.comphenix.protocol.error;
+
+import javax.annotation.Nullable;
+
+/**
+ * Represents a error or warning report.
+ * 
+ * @author Kristian
+ */
+public class Report {
+	private final ReportType type;
+	private final Throwable exception;
+	private final Object[] messageParameters;
+	private final Object[] callerParameters;
+	
+	/**
+	 * Must be constructed through the factory method in Report.
+	 */
+	public static class ReportBuilder {
+		private ReportType type;
+		private Throwable exception;
+		private Object[] messageParameters;
+		private Object[] callerParameters;
+	
+		private ReportBuilder() {
+			// Don't allow
+		}
+		
+		/**
+		 * Set the current report type. Cannot be NULL.
+		 * @param type - report type.
+		 * @return This builder, for chaining.
+		 */
+		public ReportBuilder type(ReportType type) {
+			if (type == null)
+				throw new IllegalArgumentException("Report type cannot be set to NULL.");
+			this.type = type;
+			return this;
+		}
+		
+		/**
+		 * Set the current exception that occured.
+		 * @param exception - exception that occured.
+		 * @return This builder, for chaining.
+		 */
+		public ReportBuilder error(@Nullable Throwable exception) {
+			this.exception = exception;
+			return this;
+		}
+		
+		/**
+		 * Set the message parameters that are used to construct a message text.
+		 * @param messageParameters - parameters for the report type.
+		 * @return This builder, for chaining.
+		 */
+		public ReportBuilder messageParam(@Nullable Object... messageParameters) {
+			this.messageParameters = messageParameters;
+			return this;
+		}
+		
+		/**
+		 * Set the parameters in the caller method. This is optional.
+		 * @param callerParameters - parameters of the caller method.
+		 * @return This builder, for chaining.
+		 */
+		public ReportBuilder callerParam(@Nullable Object... callerParameters) {
+			this.callerParameters = callerParameters;
+			return this;
+		}
+		
+		/**
+		 * Construct a new report with the provided input.
+		 * @return A new report.
+		 */
+		public Report build() {
+			return new Report(type, exception, messageParameters, callerParameters);
+		}
+	}
+	
+	/**
+	 * Construct a new report builder.
+	 * @param type - the initial report type.
+	 * @return Report builder.
+	 */
+	public static ReportBuilder newBuilder(ReportType type) {
+		return new ReportBuilder().type(type);
+	}
+
+	/**
+	 * Construct a new report with the given type and parameters.
+	 * @param exception - exception that occured in the caller method.
+	 * @param type - the report type that will be used to construct the message.
+	 * @param messageParameters - parameters used to construct the report message.
+	 * @param callerParameters - parameters from the caller method.
+	 */ 
+	protected Report(ReportType type, @Nullable Throwable exception, @Nullable Object[] messageParameters, @Nullable Object[] callerParameters) {
+		if (type == null)
+			throw new IllegalArgumentException("type cannot be NULL.");
+		this.type = type;
+		this.exception = exception;
+		this.messageParameters = messageParameters;
+		this.callerParameters = callerParameters;
+	}
+	
+	/**
+	 * Format the current report type with the provided message parameters.
+	 * @return The formated report message.
+	 */
+	public String getReportMessage() {
+		return type.getMessage(messageParameters);
+	}
+	
+	/**
+	 * Retrieve the message parameters that will be used to construc the report message.
+	 * <p<
+	 * This should not be confused with the method parameters of the caller method.
+	 * @return Message parameters.
+	 */
+	public Object[] getMessageParameters() {
+		return messageParameters;
+	}
+	
+	/**
+	 * Retrieve the parameters of the caller method. Optional - may be NULL.
+	 * @return Parameters or the caller method.
+	 */
+	public Object[] getCallerParameters() {
+		return callerParameters;
+	}
+	
+	/**
+	 * Retrieve the report type.
+	 * @return Report type.
+	 */
+	public ReportType getType() {
+		return type;
+	}
+	
+	/**
+	 * Retrieve the associated exception, or NULL if not found.
+	 * @return Associated exception, or NULL.
+	 */
+	public Throwable getException() {
+		return exception;
+	}
+	
+	/**
+	 * Determine if we have any message parameters.
+	 * @return TRUE if there are any message parameters, FALSE otherwise.
+	 */
+	public boolean hasMessageParameters() {
+		return messageParameters != null && messageParameters.length > 0;
+	}
+	
+	/**
+	 * Determine if we have any caller parameters.
+	 * @return TRUE if there are any caller parameters, FALSE otherwise.
+	 */
+	public boolean hasCallerParameters() {
+		return callerParameters != null && callerParameters.length > 0;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/error/ReportType.java

@@ -0,0 +1,66 @@
+package com.comphenix.protocol.error;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.comphenix.protocol.reflect.FieldAccessException;
+
+/**
+ * Represents a strongly-typed report. Subclasses should be immutable.
+ * <p>
+ * By convention, a report must be declared as a static field publicly accessible from the sender class.
+ * @author Kristian
+ */
+public class ReportType {
+	private final String errorFormat;
+
+	/**
+	 * Construct a new report type.
+	 * @param errorFormat - string used to format the underlying report.
+	 */
+	public ReportType(String errorFormat) {
+		this.errorFormat = errorFormat;
+	}
+	
+	/**
+	 * Convert the given report to a string, using the provided parameters.
+	 * @param parameters - parameters to insert, or NULL to insert nothing.
+	 * @return The full report in string format.
+	 */
+	public String getMessage(Object[] parameters) {
+		if (parameters == null || parameters.length == 0)
+			return toString();
+		else
+			return String.format(errorFormat, parameters);
+	}
+	
+	@Override
+	public String toString() {
+		return errorFormat;
+	}
+	
+	/**
+	 * Retrieve all publicly associated reports.
+	 * @param clazz - sender class.
+	 * @return All associated reports.
+	 */
+	public static ReportType[] getReports(Class<?> clazz) {
+		if (clazz == null)
+			throw new IllegalArgumentException("clazz cannot be NULL.");
+		List<ReportType> result = new ArrayList<ReportType>();
+		
+		for (Field field : clazz.getFields()) {
+			if (Modifier.isStatic(field.getModifiers()) && 
+				ReportType.class.isAssignableFrom(field.getDeclaringClass())) {
+				try {
+					result.add((ReportType) field.get(null));
+				} catch (IllegalAccessException e) {
+					throw new FieldAccessException("Unable to access field.", e);
+				}
+			}
+		}
+		return result.toArray(new ReportType[0]);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketEvent.java

@@ -44,6 +44,9 @@ public class PacketEvent extends EventObject implements Cancellable {
 	private AsyncMarker asyncMarker;
 	private boolean asynchronous;
 	
+	// Whether or not a packet event is read only
+	private boolean readOnly;
+	
 	/**
 	 * Use the static constructors to create instances of this event.
 	 * @param source - the event source.
@@ -114,6 +117,8 @@ public class PacketEvent extends EventObject implements Cancellable {
 	 * @param packet - the packet that will be sent instead.
 	 */
 	public void setPacket(PacketContainer packet) {
+		if (readOnly)
+			throw new IllegalStateException("The packet event is read-only.");
 		this.packet = packet;
 	}
 
@@ -147,6 +152,8 @@ public class PacketEvent extends EventObject implements Cancellable {
 	 * @param cancel - TRUE if it should be cancelled, FALSE otherwise.
 	 */
 	public void setCancelled(boolean cancel) {
+		if (readOnly)
+			throw new IllegalStateException("The packet event is read-only.");
 		this.cancel = cancel;
 	}
 
@@ -193,9 +200,34 @@ public class PacketEvent extends EventObject implements Cancellable {
 	public void setAsyncMarker(AsyncMarker asyncMarker) {
 		if (isAsynchronous())
 			throw new IllegalStateException("The marker is immutable for asynchronous events");
+		if (readOnly)
+			throw new IllegalStateException("The packet event is read-only.");
 		this.asyncMarker = asyncMarker;
 	}
 
+	/**
+	 * Determine if the current packet event is read only.
+	 * <p>
+	 * This is used to ensure that a monitor listener doesn't accidentally alter the state of the event. However,
+	 * it is still possible to modify the packet itself, as it would require too many resources to verify its integrity.
+	 * <p>
+	 * Thus, the packet is considered immutable if the packet event is read only.
+	 * @return TRUE if it is, FALSE otherwise.
+	 */
+	public boolean isReadOnly() {
+		return readOnly;
+	}
+	
+	/**
+	 * Set the read-only state of this packet event.
+	 * <p>
+	 * This will be reset for every packet listener.
+	 * @param readOnly - TRUE if it is read-only, FALSE otherwise.
+	 */
+	public void setReadOnly(boolean readOnly) {
+		this.readOnly = readOnly;
+	}
+	
 	/**
 	 * Determine if the packet event has been executed asynchronously or not.
 	 * @return TRUE if this packet event is asynchronous, FALSE otherwise.

ProtocolLib/src/main/java/com/comphenix/protocol/injector/BukkitUnwrapper.java

@@ -25,6 +25,9 @@ import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.injector.PacketConstructor.Unwrapper;
 import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.instances.DefaultInstances;
@@ -42,8 +45,32 @@ import com.google.common.primitives.Primitives;
  * @author Kristian
  */
 public class BukkitUnwrapper implements Unwrapper {
+	public static final ReportType REPORT_ILLEGAL_ARGUMENT = new ReportType("Illegal argument.");
+	public static final ReportType REPORT_SECURITY_LIMITATION = new ReportType("Security limitation.");
+	public static final ReportType REPORT_CANNOT_FIND_UNWRAP_METHOD = new ReportType("Cannot find method.");
+	
+	public static final ReportType REPORT_CANNOT_READ_FIELD_HANDLE = new ReportType("Cannot read field 'handle'.");
+	
 	private static Map<Class<?>, Unwrapper> unwrapperCache = new ConcurrentHashMap<Class<?>, Unwrapper>();
 	
+	// The current error reporter
+	private final ErrorReporter reporter;
+	
+	/**
+	 * Construct a new Bukkit unwrapper with ProtocolLib's default error reporter.
+	 */
+	public BukkitUnwrapper() {
+		this(ProtocolLibrary.getErrorReporter());
+	}
+	
+	/**
+	 * Construct a new Bukkit unwrapper with the given error reporter.
+	 * @param reporter - the error reporter to use.
+	 */
+	public BukkitUnwrapper(ErrorReporter reporter) {
+		 this.reporter = reporter;
+	}
+	
 	@SuppressWarnings("unchecked")
 	@Override
 	public Object unwrapItem(Object wrappedObject) {
@@ -111,8 +138,9 @@ public class BukkitUnwrapper implements Unwrapper {
 						return find.invoke(wrappedObject);
 						
 					} catch (IllegalArgumentException e) {
-						ProtocolLibrary.getErrorReporter().reportDetailed(
+						reporter.reportDetailed(this, 
-								this, "Illegal argument.", e, wrappedObject, find);
+								Report.newBuilder(REPORT_ILLEGAL_ARGUMENT).error(e).callerParam(wrappedObject, find)
+						);
 					} catch (IllegalAccessException e) {
 						// Should not occur either
 						return null;
@@ -129,7 +157,9 @@ public class BukkitUnwrapper implements Unwrapper {
 			return methodUnwrapper;
 			
 		} catch (SecurityException e) {
-			ProtocolLibrary.getErrorReporter().reportDetailed(this, "Security limitation.", e, type.getName());
+			reporter.reportDetailed(this, 
+					Report.newBuilder(REPORT_SECURITY_LIMITATION).error(e).callerParam(type)
+			);
 		} catch (NoSuchMethodException e) {
 			// Try getting the field unwrapper too
 			Unwrapper fieldUnwrapper = getFieldUnwrapper(type);
@@ -137,7 +167,8 @@ public class BukkitUnwrapper implements Unwrapper {
 			if (fieldUnwrapper != null)
 				return fieldUnwrapper;
 			else
-				ProtocolLibrary.getErrorReporter().reportDetailed(this, "Cannot find method.", e, type.getName());
+				reporter.reportDetailed(this, 
+						Report.newBuilder(REPORT_CANNOT_FIND_UNWRAP_METHOD).error(e).callerParam(type));
 		}
 		
 		// Default method
@@ -160,8 +191,9 @@ public class BukkitUnwrapper implements Unwrapper {
 					try {
 						return FieldUtils.readField(find, wrappedObject, true);
 					} catch (IllegalAccessException e) {
-						ProtocolLibrary.getErrorReporter().reportDetailed(
+						reporter.reportDetailed(this, 
-								this, "Cannot read field 'handle'.", e, wrappedObject, find.getName());
+								Report.newBuilder(REPORT_CANNOT_READ_FIELD_HANDLE).error(e).callerParam(wrappedObject, find)
+						);
 						return null;
 					}
 				}
@@ -172,9 +204,9 @@ public class BukkitUnwrapper implements Unwrapper {
 			
 		} else {
 			// Inform about this too
-			ProtocolLibrary.getErrorReporter().reportDetailed(
+			reporter.reportDetailed(this, 
-					this, "Could not find field 'handle'.", 
+					Report.newBuilder(REPORT_CANNOT_READ_FIELD_HANDLE).callerParam(find)
-					new Exception("Unable to find 'handle'"), type.getName());
+			);
 			return null;
 		}
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/ListenerInvoker.java

@@ -52,8 +52,9 @@ public interface ListenerInvoker {
 	public abstract void unregisterPacketClass(Class<?> clazz);
 
 	/**
-	 * Remove a given class from the packet registry. Internal method.
+	 * Register a given class in the packet registry. Internal method.
-	 * @param clazz - class to remove.
+	 * @param clazz - class to register.
+	 * @param packetID - the the new associated packet ID.
 	 */
 	public abstract void registerPacketClass(Class<?> clazz, int packetID);
 

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -50,6 +50,8 @@ import com.comphenix.protocol.ProtocolManager;
 import com.comphenix.protocol.async.AsyncFilterManager;
 import com.comphenix.protocol.async.AsyncMarker;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.*;
 import com.comphenix.protocol.injector.packet.PacketInjector;
 import com.comphenix.protocol.injector.packet.PacketInjectorBuilder;
@@ -61,11 +63,28 @@ import com.comphenix.protocol.injector.spigot.SpigotPacketInjector;
 import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftVersion;
 import com.google.common.base.Objects;
 import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableSet;
 
 public final class PacketFilterManager implements ProtocolManager, ListenerInvoker {
+	public static final ReportType REPORT_CANNOT_LOAD_PACKET_LIST = new ReportType("Cannot load server and client packet list.");
+	public static final ReportType REPORT_CANNOT_INITIALIZE_PACKET_INJECTOR = new ReportType("Unable to initialize packet injector");
+	
+	public static final ReportType REPORT_PLUGIN_DEPEND_MISSING = 
+			new ReportType("%s doesn't depend on ProtocolLib. Check that its plugin.yml has a 'depend' directive.");
+	
+	// Registering packet IDs that are not supported
+	public static final ReportType REPORT_UNSUPPORTED_SERVER_PACKET_ID = new ReportType("[%s] Unsupported server packet ID in current Minecraft version: %s");
+	public static final ReportType REPORT_UNSUPPORTED_CLIENT_PACKET_ID = new ReportType("[%s] Unsupported client packet ID in current Minecraft version: %s");
+	
+	// Problems injecting and uninjecting players
+	public static final ReportType REPORT_CANNOT_UNINJECT_PLAYER = new ReportType("Unable to uninject net handler for player.");
+	public static final ReportType REPORT_CANNOT_UNINJECT_OFFLINE_PLAYER = new ReportType("Unable to uninject logged off player.");
+	public static final ReportType REPORT_CANNOT_INJECT_PLAYER = new ReportType("Unable to inject player.");
+
+	public static final ReportType REPORT_CANNOT_UNREGISTER_PLUGIN = new ReportType("Unable to handle disabled plugin.");
 	
 	/**
 	 * Sets the inject hook type. Different types allow for maximum compatibility.
@@ -147,11 +166,22 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 	// Spigot listener, if in use
 	private SpigotPacketInjector spigotInjector;
 	
+	// Plugin verifier
+	private PluginVerifier pluginVerifier;
+	
 	/**
 	 * Only create instances of this class if protocol lib is disabled.
-	 * @param unhookTask 
 	 */
-	public PacketFilterManager(ClassLoader classLoader, Server server, DelayedSingleTask unhookTask, ErrorReporter reporter) {
+	public PacketFilterManager(ClassLoader classLoader, Server server, Plugin library, DelayedSingleTask unhookTask, ErrorReporter reporter) {
+		this(classLoader, server, library, new MinecraftVersion(server), unhookTask, reporter);
+	}
+	
+	/**
+	 * Only create instances of this class if protocol lib is disabled.
+	 */
+	public PacketFilterManager(ClassLoader classLoader, Server server, Plugin library, 
+							   MinecraftVersion mcVersion, DelayedSingleTask unhookTask, ErrorReporter reporter) {
+		
 		if (reporter == null)
 			throw new IllegalArgumentException("reporter cannot be NULL.");
 		if (classLoader == null)
@@ -170,6 +200,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		this.classLoader = classLoader;
 		this.reporter = reporter;
 		
+		// The plugin verifier
+		this.pluginVerifier = new PluginVerifier(library);
+		
 		// Used to determine if injection is needed
 		Predicate<GamePhase> isInjectionNecessary = new Predicate<GamePhase>() {
 			@Override
@@ -201,6 +234,7 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 						classLoader(classLoader).
 						packetListeners(packetListeners).
 						injectionFilter(isInjectionNecessary).
+						version(mcVersion).
 						buildHandler();
 			
 				this.packetInjector = PacketInjectorBuilder.newBuilder().
@@ -218,11 +252,11 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 				knowsServerPackets = PacketRegistry.getServerPackets() != null;
 				knowsClientPackets = PacketRegistry.getClientPackets() != null;
 			} catch (FieldAccessException e) {
-				reporter.reportWarning(this, "Cannot load server and client packet list.", e);
+				reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_LOAD_PACKET_LIST).error(e));
 			}
 
-		} catch (IllegalAccessException e) {
+		} catch (FieldAccessException e) {
-			reporter.reportWarning(this, "Unable to initialize packet injector.", e);
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_INITIALIZE_PACKET_INJECTOR).error(e));
 		}
 	}
 	
@@ -259,6 +293,20 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		return ImmutableSet.copyOf(packetListeners);
 	}
 
+	/**
+	 * Warn of common programming mistakes.
+	 * @param plugin - plugin to check.
+	 */
+	private void printPluginWarnings(Plugin plugin) {
+		switch (pluginVerifier.verify(plugin)) {
+			case NO_DEPEND:
+				reporter.reportWarning(this, Report.newBuilder(REPORT_PLUGIN_DEPEND_MISSING).messageParam(plugin.getName()));
+			case VALID:
+				// Do nothing
+				break;
+		}
+	}
+	
 	@Override
 	public void addPacketListener(PacketListener listener) {
 		if (listener == null)
@@ -267,6 +315,8 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		// A listener can only be added once
 		if (packetListeners.contains(listener))
 			return;
+		// Check plugin
+		printPluginWarnings(listener.getPlugin());
 		
 		ListeningWhitelist sending = listener.getSendingWhitelist();
 		ListeningWhitelist receiving = listener.getReceivingWhitelist();
@@ -446,6 +496,7 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 			asyncFilterManager.enqueueSyncPacket(event, event.getAsyncMarker());
 
 			// The above makes a copy of the event, so it's safe to cancel it
+			event.setReadOnly(false);
 			event.setCancelled(true);
 		}
 	}
@@ -478,10 +529,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 				if (!knowsServerPackets || PacketRegistry.getServerPackets().contains(packetID))
 					playerInjection.addPacketHandler(packetID);
 				else
-					reporter.reportWarning(this, String.format(
+					reporter.reportWarning(this, 
-							"[%s] Unsupported server packet ID in current Minecraft version: %s",
+							Report.newBuilder(REPORT_UNSUPPORTED_SERVER_PACKET_ID).messageParam(PacketAdapter.getPluginName(listener), packetID)
-							PacketAdapter.getPluginName(listener), packetID
+					);
-					));
 			}
 			
 			// As above, only for client packets
@@ -489,10 +539,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 				if (!knowsClientPackets || PacketRegistry.getClientPackets().contains(packetID))
 					packetInjector.addPacketHandler(packetID);
 				else
-					reporter.reportWarning(this, String.format(
+					reporter.reportWarning(this, 
-							"[%s] Unsupported client packet ID in current Minecraft version: %s",
+							Report.newBuilder(REPORT_UNSUPPORTED_CLIENT_PACKET_ID).messageParam(PacketAdapter.getPluginName(listener), packetID)
-							PacketAdapter.getPluginName(listener), packetID
+					);
-					));
 			}
 		}
 	}
@@ -529,6 +578,14 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		if (packetCreation.compareAndSet(false, true)) 
 			incrementPhases(GamePhase.PLAYING);
 		
+		// Inform the MONITOR packets
+		if (!filters) {
+			sendingListeners.invokePacketSending(
+					reporter, 
+					PacketEvent.fromServer(this, packet, reciever), 
+					ListenerPriority.MONITOR);
+		}
+		
 		playerInjection.sendServerPacket(reciever, packet, filters);
 	}
 
@@ -559,9 +616,16 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 				mcPacket = event.getPacket().getHandle();
 			else
 				return;
+			
+		} else {
+			// Let the monitors know though
+			recievedListeners.invokePacketSending(
+					reporter, 
+					PacketEvent.fromClient(this, packet, sender), 
+					ListenerPriority.MONITOR);
 		}
 		
-		playerInjection.processPacket(sender, mcPacket);
+		playerInjection.recieveClientPacket(sender, mcPacket);
 	}
 	
 	@Override
@@ -673,8 +737,11 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		try {
 			// Let's clean up the other injection first.
 			playerInjection.uninjectPlayer(event.getPlayer().getAddress());
+			playerInjection.updatePlayer(event.getPlayer());
 		} catch (Exception e) {
-			reporter.reportDetailed(PacketFilterManager.this, "Unable to uninject net handler for player.", e, event);
+			reporter.reportDetailed(PacketFilterManager.this, 
+					Report.newBuilder(REPORT_CANNOT_UNINJECT_PLAYER).callerParam(event).error(e)
+			);
 		}
     }
 	
@@ -683,7 +750,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 			// This call will be ignored if no listeners are registered
 			playerInjection.injectPlayer(event.getPlayer(), ConflictStrategy.OVERRIDE);
 		} catch (Exception e) {
-			reporter.reportDetailed(PacketFilterManager.this, "Unable to inject player.", e, event);
+			reporter.reportDetailed(PacketFilterManager.this, 
+					Report.newBuilder(REPORT_CANNOT_INJECT_PLAYER).callerParam(event).error(e)
+			);
 		}
     }
     
@@ -695,7 +764,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 			playerInjection.handleDisconnect(player);
 			playerInjection.uninjectPlayer(player);
 		} catch (Exception e) {
-			reporter.reportDetailed(PacketFilterManager.this, "Unable to uninject logged off player.", e, event);
+			reporter.reportDetailed(PacketFilterManager.this, 
+					Report.newBuilder(REPORT_CANNOT_UNINJECT_OFFLINE_PLAYER).callerParam(event).error(e)
+			);
 		}
     }
     
@@ -706,7 +777,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 				removePacketListeners(event.getPlugin());
 			}
 		} catch (Exception e) {
-			reporter.reportDetailed(PacketFilterManager.this, "Unable handle disabled plugin.", e, event);
+			reporter.reportDetailed(PacketFilterManager.this, 
+					Report.newBuilder(REPORT_CANNOT_UNREGISTER_PLUGIN).callerParam(event).error(e)
+			);
 		}
     }
     
@@ -733,7 +806,14 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		if (!MinecraftReflection.isPacketClass(packet))
 			throw new IllegalArgumentException("The given object " + packet + " is not a packet.");
 		
-		return PacketRegistry.getPacketToID().get(packet.getClass());
+		Integer id = PacketRegistry.getPacketToID().get(packet.getClass());
+		
+		if (id != null) {
+			return id;
+		} else {
+			throw new IllegalArgumentException(
+					"Unable to find associated packet of " + packet + ": Lookup returned NULL.");
+		}
 	}
 	
 	@Override

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PluginVerifier.java

@@ -0,0 +1,226 @@
+package com.comphenix.protocol.injector;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.PluginLoadOrder;
+
+import com.google.common.collect.Sets;
+
+/**
+ * Determine if a plugin using ProtocolLib is correct.
+ * 
+ * @author Kristian
+ */
+class PluginVerifier {
+	/**
+	 * A named plugin cannot be found.
+	 * @author Kristian
+	 */
+	public static class PluginNotFoundException extends RuntimeException {
+		/**
+		 * Generated by Eclipse.
+		 */
+		private static final long serialVersionUID = 8956699101336877611L;
+
+		public PluginNotFoundException() {
+			super();
+		}
+
+		public PluginNotFoundException(String message) {
+			super(message);
+		}
+	}
+	
+	public enum VerificationResult {
+		VALID,
+		
+		/**
+		 * The plugin doesn't depend on ProtocolLib directly or indirectly.
+		 */
+		NO_DEPEND;
+		
+		/**
+		 * Determine if the verification was valid.
+		 */
+		public boolean isValid() {
+			return this == VALID;
+		}
+	}
+	
+	/**
+	 * Set of plugins that have been loaded after ProtocolLib.
+	 */
+	private final Set<String> loadedAfter = new HashSet<String>();
+	
+	/**
+	 * Reference to ProtocolLib.
+	 */
+	private final Plugin dependency;
+
+	/**
+	 * Construct a new plugin verifier.
+	 * @param dependency - reference to ProtocolLib, a dependency we require of plugins.
+	 */
+	public PluginVerifier(Plugin dependency) {
+		if (dependency == null)
+			throw new IllegalArgumentException("dependency cannot be NULL.");
+		// This would screw with the assumption in hasDependency(Plugin, Plugin)
+		if (safeConversion(dependency.getDescription().getLoadBefore()).size() > 0)
+			throw new IllegalArgumentException("dependency cannot have a load directives.");
+		
+		this.dependency = dependency;
+	}
+
+	/**
+	 * Retrieve a plugin by name.
+	 * @param pluginName - the non-null name of the plugin to retrieve.
+	 * @return The retrieved plugin.
+	 * @throws PluginNotFoundException If a plugin with the given name cannot be found.
+	 */
+	private Plugin getPlugin(String pluginName) {
+		Plugin plugin = getPluginOrDefault(pluginName);
+		
+		// Ensure that the plugin exists
+		if (plugin != null)
+			return plugin;
+		else
+			throw new PluginNotFoundException("Cannot find plugin " + pluginName); 
+	}
+	
+	/**
+	 * Retrieve a plugin by name.
+	 * @param pluginName - the non-null name of the plugin to retrieve.
+	 * @return The retrieved plugin, or NULL if not found.
+	 */
+	private Plugin getPluginOrDefault(String pluginName) {
+		return Bukkit.getPluginManager().getPlugin(pluginName);
+	}
+	
+	/**
+	 * Performs simple verifications on the given plugin.
+	 * <p>
+	 * Results may be cached.
+	 * @param pluginName - the plugin to verify.
+	 * @return A verification result.
+	 * @throws IllegalArgumentException If plugin name is NULL.
+	 * @throws PluginNotFoundException If a plugin with the given name cannot be found.
+	 */
+	public VerificationResult verify(String pluginName) {
+		if (pluginName == null)
+			throw new IllegalArgumentException("pluginName cannot be NULL.");
+		return verify(getPlugin(pluginName));
+	}
+	
+	/**
+	 * Performs simple verifications on the given plugin.
+	 * <p>
+	 * Results may be cached.
+	 * @param plugin - the plugin to verify.
+	 * @return A verification result.
+	 * @throws IllegalArgumentException If plugin name is NULL.
+	 * @throws PluginNotFoundException If a plugin with the given name cannot be found.
+	 */
+	public VerificationResult verify(Plugin plugin) {
+		if (plugin == null)
+			throw new IllegalArgumentException("plugin cannot be NULL.");
+		
+		// Skip the load order check for ProtocolLib itself
+		if (!dependency.equals(plugin)) {
+			if (!loadedAfter.contains(plugin.getName())) {
+				if (verifyLoadOrder(dependency, plugin)) {
+					// Memorize
+					loadedAfter.add(plugin.getName());
+				} else {
+					return VerificationResult.NO_DEPEND;
+				}
+			}
+		}
+		
+		// Everything seems to be in order
+		return VerificationResult.VALID;
+	}
+	
+	/**
+	 * Determine if a given plugin is guarenteed to be loaded before the other.
+	 * <p>
+	 * Note that the before plugin is assumed to have no "load" directives - that is, plugins to be 
+	 * loaded after itself. The after plugin may have "load" directives, but it is irrelevant for our purposes.
+	 * @param beforePlugin - the plugin that is loaded first.
+	 * @param afterPlugin - the plugin that is loaded last.
+	 * @return TRUE if it will, FALSE if it may or must load in the opposite other.
+	 */
+	private boolean verifyLoadOrder(Plugin beforePlugin, Plugin afterPlugin) {
+		// If a plugin has a dependency, it will be loaded after its dependency
+		if (hasDependency(afterPlugin, beforePlugin)) {
+			return true;
+		}
+		
+		// No dependency - check the load order
+		if (beforePlugin.getDescription().getLoad() == PluginLoadOrder.STARTUP && 
+			afterPlugin.getDescription().getLoad() == PluginLoadOrder.POSTWORLD) {
+			return true;
+		}
+		return false;
+	}
+	
+	/**
+	 * Determine if a plugin has a given dependency, either directly or indirectly.
+	 * @param plugin - the plugin to check.
+	 * @param dependency - the dependency to find.
+	 * @return TRUE if the plugin has the given dependency, FALSE otherwise. 
+	 */
+	private boolean hasDependency(Plugin plugin, Plugin dependency) {
+		return hasDependency(plugin, dependency, Sets.<String>newHashSet());
+	}
+	
+	/**
+	 * Convert a list to a set. 
+	 * <p>
+	 * A null list will be converted to an empty set.
+	 * @param list - the list to convert.
+	 * @return The converted list.
+	 */
+	private Set<String> safeConversion(List<String> list) {
+		if (list == null)
+			return Collections.emptySet();
+		else
+			return Sets.newHashSet(list);
+	}
+	
+	// Avoid cycles. DFS.
+	private boolean hasDependency(Plugin plugin, Plugin dependency, Set<String> checking) {
+		Set<String> childNames = Sets.union(
+				 safeConversion(plugin.getDescription().getDepend()),
+				 safeConversion(plugin.getDescription().getSoftDepend())
+		);
+		
+		// Ensure that the same plugin isn't processed twice
+		if (!checking.add(plugin.getName())) {
+			throw new IllegalStateException("Cycle detected in dependency graph: " + plugin);
+		}
+		// Look for the dependency in the immediate children
+		if (childNames.contains(dependency.getName())) {
+			return true;
+		}
+		
+		// Recurse through their dependencies
+		for (String childName : childNames) {
+			Plugin childPlugin = getPluginOrDefault(childName);
+			
+			if (childPlugin != null && hasDependency(childPlugin, dependency, checking)) {
+				return true;
+			}
+		}
+		
+		// Cross edges are permitted
+		checking.remove(plugin.getName());
+		
+		// No dependency found!
+		return false;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/SortedPacketListenerList.java

@@ -19,8 +19,10 @@ package com.comphenix.protocol.injector;
 
 import java.util.Collection;
 
+import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.concurrency.AbstractConcurrentListenerMultimap;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.events.ListenerPriority;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.events.PacketListener;
 
@@ -30,6 +32,9 @@ import com.comphenix.protocol.events.PacketListener;
  * @author Kristian
  */
 public final class SortedPacketListenerList extends AbstractConcurrentListenerMultimap<PacketListener> {
+	public SortedPacketListenerList() {
+		super(Packets.MAXIMUM_PACKET_ID);
+	}
 	
 	/**
 	 * Invokes the given packet event for every registered listener.
@@ -45,7 +50,44 @@ public final class SortedPacketListenerList extends AbstractConcurrentListenerMu
 		// The returned list is thread-safe
 		for (PrioritizedListener<PacketListener> element : list) {
 			try {
+				event.setReadOnly(element.getPriority() == ListenerPriority.MONITOR);
 				element.getListener().onPacketReceiving(event);
+				
+			} catch (OutOfMemoryError e) {
+				throw e;
+			} catch (ThreadDeath e) {
+				throw e;
+			} catch (Throwable e) {
+				// Minecraft doesn't want your Exception.
+				reporter.reportMinimal(element.getListener().getPlugin(), "onPacketReceiving(PacketEvent)", e, 
+						event.getPacket().getHandle());
+			}
+		}
+	}
+	
+	/**
+	 * Invokes the given packet event for every registered listener of the given priority.
+	 * @param reporter - the error reporter that will be used to inform about listener exceptions.
+	 * @param event - the packet event to invoke.
+	 * @param priorityFilter - the required priority for a listener to be invoked.
+	 */
+	public void invokePacketRecieving(ErrorReporter reporter, PacketEvent event, ListenerPriority priorityFilter) {
+		Collection<PrioritizedListener<PacketListener>> list = getListener(event.getPacketID());
+		
+		if (list == null)
+			return;
+
+		for (PrioritizedListener<PacketListener> element : list) {
+			try {
+				if (element.getPriority() == priorityFilter) {
+					event.setReadOnly(element.getPriority() == ListenerPriority.MONITOR);
+					element.getListener().onPacketReceiving(event);
+				}
+				
+			} catch (OutOfMemoryError e) {
+				throw e;
+			} catch (ThreadDeath e) {
+				throw e;
 			} catch (Throwable e) {
 				// Minecraft doesn't want your Exception.
 				reporter.reportMinimal(element.getListener().getPlugin(), "onPacketReceiving(PacketEvent)", e, 
@@ -67,7 +109,13 @@ public final class SortedPacketListenerList extends AbstractConcurrentListenerMu
 		
 		for (PrioritizedListener<PacketListener> element : list) {
 			try {
+				event.setReadOnly(element.getPriority() == ListenerPriority.MONITOR);
 				element.getListener().onPacketSending(event);
+				
+			} catch (OutOfMemoryError e) {
+				throw e;
+			} catch (ThreadDeath e) {
+				throw e;
 			} catch (Throwable e) {
 				// Minecraft doesn't want your Exception.
 				reporter.reportMinimal(element.getListener().getPlugin(), "onPacketSending(PacketEvent)", e, 
@@ -76,4 +124,34 @@ public final class SortedPacketListenerList extends AbstractConcurrentListenerMu
 		}
 	}
 	
+	/**
+	 * Invokes the given packet event for every registered listener of the given priority.
+	 * @param reporter - the error reporter that will be used to inform about listener exceptions.
+	 * @param event - the packet event to invoke.
+	 * @param priorityFilter - the required priority for a listener to be invoked.
+	 */
+	public void invokePacketSending(ErrorReporter reporter, PacketEvent event, ListenerPriority priorityFilter) {
+		Collection<PrioritizedListener<PacketListener>> list = getListener(event.getPacketID());
+		
+		if (list == null)
+			return;
+		
+		for (PrioritizedListener<PacketListener> element : list) {
+			try {
+				if (element.getPriority() == priorityFilter) {
+					event.setReadOnly(element.getPriority() == ListenerPriority.MONITOR);
+					element.getListener().onPacketSending(event);
+				}
+				
+			} catch (OutOfMemoryError e) {
+				throw e;
+			} catch (ThreadDeath e) {
+				throw e;
+			} catch (Throwable e) {
+				// Minecraft doesn't want your Exception.
+				reporter.reportMinimal(element.getListener().getPlugin(), "onPacketSending(PacketEvent)", e, 
+						event.getPacket().getHandle());
+			}
+		}
+	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/PacketInjectorBuilder.java

@@ -8,6 +8,7 @@ import com.comphenix.protocol.error.ErrorReporter;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.PacketFilterManager;
 import com.comphenix.protocol.injector.player.PlayerInjectionHandler;
+import com.comphenix.protocol.reflect.FieldAccessException;
 import com.google.common.base.Preconditions;
 
 /**
@@ -100,9 +101,9 @@ public class PacketInjectorBuilder {
 	 * <p>
 	 * Note that any non-null builder parameters must be set.
 	 * @return The created injector.
-	 * @throws IllegalAccessException If anything goes wrong in terms of reflection.
+	 * @throws FieldAccessException If anything goes wrong in terms of reflection.
 	 */
-	public PacketInjector buildInjector() throws IllegalAccessException {
+	public PacketInjector buildInjector() throws FieldAccessException {
 		initializeDefaults();
 		return new ProxyPacketInjector(classLoader, invoker, playerInjection, reporter);
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/PacketRegistry.java

@@ -25,10 +25,17 @@ import java.util.Set;
 
 import net.sf.cglib.proxy.Factory;
 
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyClassContract;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.wrappers.TroveWrapper;
 import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableSet;
 
@@ -39,6 +46,13 @@ import com.google.common.collect.ImmutableSet;
  */
 @SuppressWarnings("rawtypes")
 public class PacketRegistry {
+	public static final ReportType REPORT_CANNOT_CORRECT_TROVE_MAP = new ReportType("Unable to correct no entry value.");
+	
+	public static final ReportType REPORT_INSUFFICIENT_SERVER_PACKETS = new ReportType("Too few server packets detected: %s");
+	public static final ReportType REPORT_INSUFFICIENT_CLIENT_PACKETS = new ReportType("Too few client packets detected: %s");
+	
+	private static final int MIN_SERVER_PACKETS = 5;
+	private static final int MIN_CLIENT_PACKETS = 5;
 
 	// Fuzzy reflection
 	private static FuzzyReflection packetRegistry;
@@ -67,6 +81,14 @@ public class PacketRegistry {
 			try {
 				Field packetsField = getPacketRegistry().getFieldByType("packetsField", Map.class);
 				packetToID = (Map<Class, Integer>) FieldUtils.readStaticField(packetsField, true);
+			} catch (IllegalArgumentException e) {
+				// Spigot 1.2.5 MCPC workaround
+				try {
+					packetToID = getSpigotWrapper();
+				} catch (Exception e2) {
+					// Very bad indeed
+					throw new IllegalArgumentException(e.getMessage() + "; Spigot workaround failed.", e2);
+				}
 				
 			} catch (IllegalAccessException e) {
 				throw new RuntimeException("Unable to retrieve the packetClassToIdMap", e);
@@ -76,6 +98,41 @@ public class PacketRegistry {
 		return packetToID;
 	}
 	
+	private static Map<Class, Integer> getSpigotWrapper() throws IllegalAccessException {
+		// If it talks like a duck, etc.
+		// Perhaps it would be nice to have a proper duck typing library as well
+		FuzzyClassContract mapLike = FuzzyClassContract.newBuilder().
+				method(FuzzyMethodContract.newBuilder().
+						nameExact("size").returnTypeExact(int.class)).
+				method(FuzzyMethodContract.newBuilder().
+						nameExact("put").parameterCount(2)).
+				method(FuzzyMethodContract.newBuilder().
+						nameExact("get").parameterCount(1)).
+				build();
+		
+		Field packetsField = getPacketRegistry().getField(
+				FuzzyFieldContract.newBuilder().typeMatches(mapLike).build());
+		Object troveMap = FieldUtils.readStaticField(packetsField, true);
+		
+		// Check for stupid no_entry_values
+		try {
+			Field field = FieldUtils.getField(troveMap.getClass(), "no_entry_value", true);
+			Integer value = (Integer) FieldUtils.readField(field, troveMap, true);
+			
+			if (value >= 0 && value < 256) {
+				// Someone forgot to set the no entry value. Let's help them.
+				FieldUtils.writeField(field, troveMap, -1);
+			}
+		} catch (IllegalArgumentException e) {
+			// Whatever			
+			ProtocolLibrary.getErrorReporter().reportWarning(PacketRegistry.class, 
+					Report.newBuilder(REPORT_CANNOT_CORRECT_TROVE_MAP).error(e));
+		}
+		
+		// We'll assume this a Trove map
+		return TroveWrapper.getDecoratedMap(troveMap);
+	}
+	
 	/**
 	 * Retrieve the cached fuzzy reflection instance allowing access to the packet registry.
 	 * @return Reflected packet registry.
@@ -109,6 +166,10 @@ public class PacketRegistry {
 	 */
 	public static Set<Integer> getServerPackets() throws FieldAccessException {
 		initializeSets();
+		
+		// Sanity check. This is impossible!
+		if (serverPackets != null && serverPackets.size() < MIN_SERVER_PACKETS) 
+			throw new FieldAccessException("Server packet list is empty. Seems to be unsupported");
 		return serverPackets;
 	}
 	
@@ -119,6 +180,10 @@ public class PacketRegistry {
 	 */
 	public static Set<Integer> getClientPackets() throws FieldAccessException {
 		initializeSets();
+		
+		// As above
+		if (clientPackets != null && clientPackets.size() < MIN_CLIENT_PACKETS) 
+			throw new FieldAccessException("Client packet list is empty. Seems to be unsupported");
 		return clientPackets;
 	}
 	
@@ -140,6 +205,16 @@ public class PacketRegistry {
 					serverPackets = ImmutableSet.copyOf(serverPacketsRef);
 					clientPackets = ImmutableSet.copyOf(clientPacketsRef);
 					
+					// Check sizes
+					if (serverPackets.size() < MIN_SERVER_PACKETS)
+						ProtocolLibrary.getErrorReporter().reportWarning(
+							PacketRegistry.class, Report.newBuilder(REPORT_INSUFFICIENT_SERVER_PACKETS).messageParam(serverPackets.size())
+						);
+					if (clientPackets.size() < MIN_CLIENT_PACKETS)
+						ProtocolLibrary.getErrorReporter().reportWarning(
+								PacketRegistry.class, Report.newBuilder(REPORT_INSUFFICIENT_CLIENT_PACKETS).messageParam(clientPackets.size())
+							);
+					
 				} else {
 					throw new FieldAccessException("Cannot retrieve packet client/server sets.");
 				}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/ProxyPacketInjector.java

@@ -37,6 +37,7 @@ import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.player.PlayerInjectionHandler;
+import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.MethodInfo;
@@ -49,6 +50,85 @@ import com.comphenix.protocol.utility.MinecraftReflection;
  * @author Kristian
  */
 class ProxyPacketInjector implements PacketInjector {
+	/**
+	 * Represents a way to update the packet ID to class lookup table.
+	 * @author Kristian
+	 */
+	private static interface PacketClassLookup {
+		public void setLookup(int packetID, Class<?> clazz);
+	}
+	
+	private static class IntHashMapLookup implements PacketClassLookup {
+		// The "put" method that associates a packet ID with a packet class
+		private Method putMethod;
+		private Object intHashMap;
+		
+		public IntHashMapLookup() throws IllegalAccessException {
+			initialize();
+		}
+		
+		@Override
+		public void setLookup(int packetID, Class<?> clazz) {
+			try {
+				putMethod.invoke(intHashMap, packetID, clazz);
+			} catch (IllegalArgumentException e) {
+				throw new RuntimeException("Illegal argument.", e);
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException("Cannot access method.", e);
+			} catch (InvocationTargetException e) {
+				throw new RuntimeException("Exception occured in IntHashMap.put.", e);
+			}
+		}
+
+		private void initialize() throws IllegalAccessException {
+			if (intHashMap == null) {
+				// We're looking for the first static field with a Minecraft-object. This should be a IntHashMap.
+				Field intHashMapField = FuzzyReflection.fromClass(MinecraftReflection.getPacketClass(), true).
+						getFieldByType(MinecraftReflection.getMinecraftObjectRegex());
+				
+				try {
+					intHashMap = FieldUtils.readField(intHashMapField, (Object) null, true);
+				} catch (IllegalArgumentException e) {
+					throw new RuntimeException("Minecraft is incompatible.", e);
+				}
+				
+				// Now, get the "put" method.
+				putMethod = FuzzyReflection.fromObject(intHashMap).
+						getMethodByParameters("put", int.class, Object.class);
+			}
+		}
+	}
+	
+	private static class ArrayLookup implements PacketClassLookup {
+		private Class<?>[] array;
+		
+		public ArrayLookup() throws IllegalAccessException {
+			initialize();
+		}
+		
+		@Override
+		public void setLookup(int packetID, Class<?> clazz) {
+			array[packetID] = clazz;
+		}
+
+		private void initialize() throws IllegalAccessException {
+			FuzzyReflection reflection = FuzzyReflection.fromClass(MinecraftReflection.getPacketClass());
+			
+			// Is there a Class array with 256 elements instead?
+			for (Field field : reflection.getFieldListByType(Class[].class)) {
+				Class<?>[] test = (Class<?>[]) FieldUtils.readField(field, (Object)null);
+				
+				if (test.length == 256) {
+					array = test;
+					return;
+				}
+			}
+			throw new IllegalArgumentException(
+					"Unable to find an array with the type " + Class[].class + 
+					" in " + MinecraftReflection.getPacketClass());
+		}
+	}
+	
 	/**
 	 * Matches the readPacketData(DataInputStream) method in Packet.
 	 */
@@ -58,9 +138,7 @@ class ProxyPacketInjector implements PacketInjector {
 			parameterCount(1).
 			build();
 	
-	// The "put" method that associates a packet ID with a packet class
+	private static PacketClassLookup lookup;
-	private static Method putMethod;
-	private static Object intHashMap;
 	
 	// The packet filter manager
 	private ListenerInvoker manager;
@@ -78,7 +156,7 @@ class ProxyPacketInjector implements PacketInjector {
 	private CallbackFilter filter;
 			
 	public ProxyPacketInjector(ClassLoader classLoader, ListenerInvoker manager, 
-						  PlayerInjectionHandler playerInjection, ErrorReporter reporter) throws IllegalAccessException {
+						  PlayerInjectionHandler playerInjection, ErrorReporter reporter) throws FieldAccessException {
 		
 		this.classLoader = classLoader;
 		this.manager = manager;
@@ -100,20 +178,21 @@ class ProxyPacketInjector implements PacketInjector {
 		}
 	}
 	
-	private void initialize() throws IllegalAccessException {
+	private void initialize() throws FieldAccessException {
-		if (intHashMap == null) {
+		if (lookup == null) {
-			// We're looking for the first static field with a Minecraft-object. This should be a IntHashMap.
+			try {
-			Field intHashMapField = FuzzyReflection.fromClass(MinecraftReflection.getPacketClass(), true).
+				lookup = new IntHashMapLookup();
-					getFieldByType(MinecraftReflection.getMinecraftObjectRegex());
+			} catch (Exception e1) {
 				
 				try { 
-				intHashMap = FieldUtils.readField(intHashMapField, (Object) null, true);
+					lookup = new ArrayLookup();
-			} catch (IllegalArgumentException e) {
+				} catch (Exception e2) {
-				throw new RuntimeException("Minecraft is incompatible.", e);
+					// Wow
+					throw new FieldAccessException(e1.getMessage() + ". Workaround failed too.", e2);
+				}
 			}
 			
-			// Now, get the "put" method.
+			// Should work fine now
-			putMethod = FuzzyReflection.fromObject(intHashMap).getMethodByParameters("put", int.class, Object.class);
 		}
 	}
 	
@@ -173,21 +252,12 @@ class ProxyPacketInjector implements PacketInjector {
 		// Add a static reference
 		Enhancer.registerStaticCallbacks(proxy, new Callback[] { NoOp.INSTANCE, modifierReadPacket, modifierRest });
 		
-		try {
 		// Override values
 		previous.put(packetID, old);
 		registry.put(proxy, packetID);
 		overwritten.put(packetID, proxy);
-			putMethod.invoke(intHashMap, packetID, proxy);
+		lookup.setLookup(packetID, proxy);
 		return true;
-			
-		} catch (IllegalArgumentException e) {
-			throw new RuntimeException("Illegal argument.", e);
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Cannot access method.", e);
-		} catch (InvocationTargetException e) {
-			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
-		}
 	}
 	
 	@Override
@@ -200,25 +270,14 @@ class ProxyPacketInjector implements PacketInjector {
 		Map<Integer, Class> previous = PacketRegistry.getPreviousPackets();
 		Map<Integer, Class> overwritten = PacketRegistry.getOverwrittenPackets();
 		
-		// Use the old class definition
-		try {
 		Class old = previous.get(packetID);
 		Class proxy = PacketRegistry.getPacketClassFromID(packetID);
 		
-			putMethod.invoke(intHashMap, packetID, old);
+		lookup.setLookup(packetID, old);
 		previous.remove(packetID);
 		registry.remove(proxy);
 		overwritten.remove(packetID);
 		return true;
-			
-			// Handle some problems
-		} catch (IllegalArgumentException e) {
-			return false;
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Cannot access method.", e);
-		} catch (InvocationTargetException e) {
-			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
-		}
 	}
 	
 	@Override

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/ReadPacketModifier.java

@@ -22,6 +22,8 @@ import java.lang.reflect.Method;
 import java.util.Map;
 
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.google.common.collect.MapMaker;
@@ -30,6 +32,8 @@ import net.sf.cglib.proxy.MethodInterceptor;
 import net.sf.cglib.proxy.MethodProxy;
 
 class ReadPacketModifier implements MethodInterceptor {
+	public static final ReportType REPORT_CANNOT_HANDLE_CLIENT_PACKET = new ReportType("Cannot handle client packet.");
+	
 	// A cancel marker
 	private static final Object CANCEL_MARKER = new Object();
 	
@@ -122,7 +126,9 @@ class ReadPacketModifier implements MethodInterceptor {
 				}
 			} catch (Throwable e) {
 				// Minecraft cannot handle this error
-				reporter.reportDetailed(this, "Cannot handle client packet.", e, args[0]);
+				reporter.reportDetailed(this, 
+						Report.newBuilder(REPORT_CANNOT_HANDLE_CLIENT_PACKET).callerParam(args[0]).error(e)
+				);
 			}
 		}
 		return returnValue;

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/InjectedArrayList.java

@@ -21,11 +21,15 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
 
 import com.comphenix.protocol.ProtocolLibrary;
-import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.player.NetworkFieldInjector.FakePacket;
+import com.comphenix.protocol.utility.MinecraftReflection;
+import com.google.common.collect.MapMaker;
 
 import net.sf.cglib.proxy.Callback;
 import net.sf.cglib.proxy.Enhancer;
@@ -38,12 +42,16 @@ import net.sf.cglib.proxy.MethodProxy;
  * @author Kristian
  */
 class InjectedArrayList extends ArrayList<Object> {
+	public static final ReportType REPORT_CANNOT_REVERT_CANCELLED_PACKET = new ReportType("Reverting cancelled packet failed.");
 	
 	/**
 	 * Silly Eclipse.
 	 */
 	private static final long serialVersionUID = -1173865905404280990L;
 	
+	// Fake inverted proxy objects
+	private static ConcurrentMap<Object, Object> delegateLookup = new MapMaker().weakKeys().makeMap();
+	
 	private transient PlayerInjector injector;
 	private transient Set<Object> ignoredPackets;
 	private transient ClassLoader classLoader;
@@ -85,15 +93,10 @@ class InjectedArrayList extends ArrayList<Object> {
 			return true;
 			
 		} catch (InvocationTargetException e) {
-			ErrorReporter reporter = ProtocolLibrary.getErrorReporter();
-			
 			// Prefer to report this to the user, instead of risking sending it to Minecraft
-			if (reporter != null) {
+			ProtocolLibrary.getErrorReporter().reportDetailed(this, 
-				reporter.reportDetailed(this, "Reverting cancelled packet failed.", e, packet);
+					Report.newBuilder(REPORT_CANNOT_REVERT_CANCELLED_PACKET).error(e).callerParam(packet)
-			} else {
+			);
-				System.out.println("[ProtocolLib] Reverting cancelled packet failed.");
-				e.printStackTrace();
-			}
 			
 			// Failure
 			return false;
@@ -111,9 +114,6 @@ class InjectedArrayList extends ArrayList<Object> {
 		ListenerInvoker invoker = injector.getInvoker();
 		
 		int packetID = invoker.getPacketID(source);
-		Class<?> type = invoker.getPacketClassFromID(packetID, true);
-
-		System.out.println(type.getName());
 
 		// We want to subtract the byte amount that were added to the running
 		// total of outstanding packets. Otherwise, cancelling too many packets
@@ -134,7 +134,7 @@ class InjectedArrayList extends ArrayList<Object> {
 		//   ect.
 		//   }
 		Enhancer ex = new Enhancer();
-		ex.setSuperclass(type);
+		ex.setSuperclass(MinecraftReflection.getPacketClass());
 		ex.setInterfaces(new Class[] { FakePacket.class } );
 		ex.setUseCache(true);
 		ex.setClassLoader(classLoader);
@@ -146,7 +146,10 @@ class InjectedArrayList extends ArrayList<Object> {
 		try {
 			// Temporarily associate the fake packet class
 			invoker.registerPacketClass(proxyClass, packetID);
-			return proxyClass.newInstance();
+			Object proxy = proxyClass.newInstance();
+			
+			InjectedArrayList.registerDelegate(proxy, source);
+			return proxy;
 			
 		} catch (Exception e) {
 			// Don't pollute the throws tree
@@ -157,6 +160,15 @@ class InjectedArrayList extends ArrayList<Object> {
 		}
 	}
 	
+	/**
+	 * Ensure that the inverted integer proxy uses the given object as source.
+	 * @param proxy - inverted integer proxy.
+	 * @param source - source object.
+	 */
+	private static void registerDelegate(Object proxy, Object source) {
+		delegateLookup.put(proxy, source);
+	}
+	
 	/**
 	 * Inverts the integer result of every integer method.
 	 * @author Kristian
@@ -164,11 +176,17 @@ class InjectedArrayList extends ArrayList<Object> {
 	private class InvertedIntegerCallback implements MethodInterceptor {		
 		@Override
 		public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+			final Object delegate = delegateLookup.get(obj);
+			
+			if (delegate == null) {
+				throw new IllegalStateException("Unable to find delegate source for " + obj);
+			}
+				
 			if (method.getReturnType().equals(int.class) && args.length == 0) {
-				Integer result = (Integer) proxy.invokeSuper(obj, args);
+				Integer result = (Integer) proxy.invoke(delegate, args);
 				return -result;
 			} else {
-				return proxy.invokeSuper(obj, args);
+				return proxy.invoke(delegate, args);
 			}
 		}
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/InjectedServerConnection.java

@@ -27,6 +27,8 @@ import net.sf.cglib.proxy.Factory;
 import org.bukkit.Server;
 
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.injector.server.AbstractInputStreamLookup;
 import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.FuzzyReflection;
@@ -40,6 +42,19 @@ import com.comphenix.protocol.utility.MinecraftReflection;
  * @author Kristian
  */
 class InjectedServerConnection {
+	// A number of things can go wrong ...
+	public static final ReportType REPORT_CANNOT_FIND_MINECRAFT_SERVER = new ReportType("Cannot extract minecraft server from Bukkit.");
+	public static final ReportType REPORT_CANNOT_INJECT_SERVER_CONNECTION = new ReportType("Cannot inject into server connection. Bad things will happen.");
+	
+	public static final ReportType REPORT_CANNOT_FIND_LISTENER_THREAD = new ReportType("Cannot find listener thread in MinecraftServer.");
+	public static final ReportType REPORT_CANNOT_READ_LISTENER_THREAD = new ReportType("Unable to read the listener thread.");
+	
+	public static final ReportType REPORT_CANNOT_FIND_SERVER_CONNECTION = new ReportType("Unable to retrieve server connection");
+	public static final ReportType REPORT_UNEXPECTED_THREAD_COUNT = new ReportType("Unexpected number of threads in %s: %s");
+	public static final ReportType REPORT_CANNOT_FIND_NET_HANDLER_THREAD = new ReportType("Unable to retrieve net handler thread.");
+	public static final ReportType REPORT_INSUFFICENT_THREAD_COUNT = new ReportType("Unable to inject %s lists in %s.");
+	
+	public static final ReportType REPORT_CANNOT_COPY_OLD_TO_NEW = new ReportType("Cannot copy old %s to new.");
 	
 	private static Field listenerThreadField;
 	private static Field minecraftServerField;
@@ -74,7 +89,6 @@ class InjectedServerConnection {
 	}
 
 	public void injectList() {
-
 		// Only execute this method once
 		if (!hasAttempted)
 			hasAttempted = true;
@@ -88,7 +102,7 @@ class InjectedServerConnection {
 		try {
 			minecraftServer = FieldUtils.readField(minecraftServerField, server, true);
 		} catch (IllegalAccessException e1) {
-			reporter.reportWarning(this, "Cannot extract minecraft server from Bukkit.");
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_FIND_MINECRAFT_SERVER));
 			return;
 		}
 		
@@ -107,7 +121,7 @@ class InjectedServerConnection {
 			
 		} catch (Exception e) {
 			// Oh damn - inform the player
-			reporter.reportDetailed(this, "Cannot inject into server connection. Bad things will happen.", e);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_CANNOT_INJECT_SERVER_CONNECTION).error(e));
 		}
 	}
 	
@@ -117,7 +131,9 @@ class InjectedServerConnection {
 				listenerThreadField = FuzzyReflection.fromObject(minecraftServer).
 										getFieldByType("networkListenThread", MinecraftReflection.getNetworkListenThreadClass());
 		} catch (RuntimeException e) {
-			reporter.reportDetailed(this, "Cannot find listener thread in MinecraftServer.", e, minecraftServer);
+			reporter.reportDetailed(this, 
+					Report.newBuilder(REPORT_CANNOT_FIND_LISTENER_THREAD).callerParam(minecraftServer).error(e)
+			);
 			return;
 		}
 
@@ -127,7 +143,7 @@ class InjectedServerConnection {
 		try {
 			listenerThread = listenerThreadField.get(minecraftServer);
 		} catch (Exception e) {
-			reporter.reportWarning(this, "Unable to read the listener thread.", e);
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_READ_LISTENER_THREAD).error(e));
 			return;
 		}
 		
@@ -140,14 +156,15 @@ class InjectedServerConnection {
 	}
 	
 	private void injectServerConnection() {
-		
 		Object serverConnection = null;
 		
 		// Careful - we might fail
 		try {
 			serverConnection = serverConnectionMethod.invoke(minecraftServer);
-		} catch (Exception ex) {
+		} catch (Exception e) {
-			reporter.reportDetailed(this, "Unable to retrieve server connection", ex, minecraftServer);
+			reporter.reportDetailed(this, 
+					Report.newBuilder(REPORT_CANNOT_FIND_SERVER_CONNECTION).callerParam(minecraftServer).error(e)
+			);
 			return;
 		}
 		
@@ -160,7 +177,9 @@ class InjectedServerConnection {
 		
 			// Verify the field count
 			if (matches.size() != 1) 
-				reporter.reportWarning(this, "Unexpected number of threads in " + serverConnection.getClass().getName());
+				reporter.reportWarning(this, 
+						Report.newBuilder(REPORT_UNEXPECTED_THREAD_COUNT).messageParam(serverConnection.getClass(), matches.size())
+				);
 			else
 				dedicatedThreadField = matches.get(0);
 		}
@@ -175,7 +194,7 @@ class InjectedServerConnection {
 				injectEveryListField(dedicatedThread, 1);
 			}
 		} catch (IllegalAccessException e) {
-			reporter.reportWarning(this, "Unable to retrieve net handler thread.", e);
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_FIND_NET_HANDLER_THREAD).error(e));
 		}
 		
 		injectIntoList(serverConnection, listField);
@@ -201,7 +220,7 @@ class InjectedServerConnection {
 		
 		// Warn about unexpected errors
 		if (lists.size() < minimum) {
-			reporter.reportWarning(this, "Unable to inject " + minimum + " lists in " + container.getClass().getName());
+			reporter.reportWarning(this, Report.newBuilder(REPORT_INSUFFICENT_THREAD_COUNT).messageParam(minimum, container.getClass()));
 		}
 	}
 	
@@ -241,8 +260,9 @@ class InjectedServerConnection {
 					try {
 						writer.copyTo(inserting, replacement, inserting.getClass());
 					} catch (Throwable e) {
-						reporter.reportDetailed(InjectedServerConnection.this, "Cannot copy old " + inserting + 
+						reporter.reportDetailed(InjectedServerConnection.this, 
-								 				" to new.", e, inserting, replacement);
+								Report.newBuilder(REPORT_CANNOT_COPY_OLD_TO_NEW).messageParam(inserting).callerParam(inserting, replacement).error(e)
+						);
 					}
 				}
 			}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetLoginInjector.java

@@ -23,6 +23,8 @@ import org.bukkit.Server;
 import org.bukkit.entity.Player;
 
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.injector.GamePhase;
 import com.comphenix.protocol.injector.player.PlayerInjectionHandler.ConflictStrategy;
 import com.comphenix.protocol.injector.server.TemporaryPlayerFactory;
@@ -35,6 +37,9 @@ import com.google.common.collect.Maps;
  * @author Kristian
  */
 class NetLoginInjector {
+	public static final ReportType REPORT_CANNOT_HOOK_LOGIN_HANDLER = new ReportType("Unable to hook %s.");
+	public static final ReportType REPORT_CANNOT_CLEANUP_LOGIN_HANDLER = new ReportType("Cannot cleanup %s.");
+	
 	private ConcurrentMap<Object, PlayerInjector> injectedLogins = Maps.newConcurrentMap();
 
 	// Handles every hook
@@ -83,8 +88,12 @@ class NetLoginInjector {
 			
 		} catch (Throwable e) {
 			// Minecraft can't handle this, so we'll deal with it here
-			reporter.reportDetailed(this, "Unable to hook " + 
+			reporter.reportDetailed(this, 
-						MinecraftReflection.getNetLoginHandlerName() + ".", e, inserting, injectionHandler);
+					Report.newBuilder(REPORT_CANNOT_HOOK_LOGIN_HANDLER).
+						messageParam(MinecraftReflection.getNetLoginHandlerName()).
+						callerParam(inserting, injectionHandler).
+						error(e)
+			);
 			return inserting;
 		}
 	}
@@ -122,8 +131,12 @@ class NetLoginInjector {
 				
 			} catch (Throwable e) {
 				// Don't leak this to Minecraft
-				reporter.reportDetailed(this, "Cannot cleanup " + 
+				reporter.reportDetailed(this, 
-						MinecraftReflection.getNetLoginHandlerName() + ".", e, removing);
+						Report.newBuilder(REPORT_CANNOT_CLEANUP_LOGIN_HANDLER).
+							messageParam(MinecraftReflection.getNetLoginHandlerName()).
+							callerParam(removing).
+							error(e)
+				);
 			}
 		}
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkFieldInjector.java

@@ -39,6 +39,7 @@ import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.reflect.VolatileField;
+import com.comphenix.protocol.utility.MinecraftVersion;
 import com.google.common.collect.Sets;
 
 /**
@@ -56,6 +57,12 @@ class NetworkFieldInjector extends PlayerInjector {
 		// Nothing
 	}
 	
+	// After commit 336a4e00668fd2518c41242755ed6b3bdc3b0e6c (Update CraftBukkit to Minecraft 1.4.4.), 
+	// CraftBukkit stopped redirecting map chunk and map chunk bulk packets to a separate queue.
+	// Thus, NetworkFieldInjector can safely handle every packet (though not perfectly - some packets
+	// will be slightly processed).
+	private MinecraftVersion safeVersion = new MinecraftVersion("1.4.4");
+	
 	// Packets to ignore
 	private Set<Object> ignoredPackets = Sets.newSetFromMap(new ConcurrentHashMap<Object, Boolean>());
 	
@@ -99,7 +106,6 @@ class NetworkFieldInjector extends PlayerInjector {
 
 	@Override
 	public void sendServerPacket(Object packet, boolean filtered) throws InvocationTargetException {
-		
 		if (networkManager != null) {
 			try {
 				if (!filtered) {
@@ -122,7 +128,11 @@ class NetworkFieldInjector extends PlayerInjector {
 	}
 	
 	@Override
-	public UnsupportedListener checkListener(PacketListener listener) {
+	public UnsupportedListener checkListener(MinecraftVersion version, PacketListener listener) {
+		if (version != null && version.compareTo(safeVersion) > 0) {
+			return null;
+			
+		} else {
 			int[] unsupported = { Packets.Server.MAP_CHUNK, Packets.Server.MAP_CHUNK_BULK };
 			
 			// Unfortunately, we don't support chunk packets
@@ -132,6 +142,7 @@ class NetworkFieldInjector extends PlayerInjector {
 				return null;
 			}
 		}
+	}
 	
 	@Override
 	public void injectManager() {

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkObjectInjector.java

@@ -40,6 +40,7 @@ import com.comphenix.protocol.injector.GamePhase;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
 import com.comphenix.protocol.injector.server.TemporaryPlayerFactory;
+import com.comphenix.protocol.utility.MinecraftVersion;
 
 /**
  * Injection method that overrides the NetworkHandler itself, and its queue-method.
@@ -53,6 +54,12 @@ public class NetworkObjectInjector extends PlayerInjector {
 	// Used to construct proxy objects
 	private ClassLoader classLoader;
 
+	// After commit 336a4e00668fd2518c41242755ed6b3bdc3b0e6c (Update CraftBukkit to Minecraft 1.4.4.), 
+	// CraftBukkit stopped redirecting map chunk and map chunk bulk packets to a separate queue.
+	// Thus, NetworkFieldInjector can safely handle every packet (though not perfectly - some packets
+	// will be slightly processed).
+	private MinecraftVersion safeVersion = new MinecraftVersion("1.4.4");
+	
 	// Shared callback filter - avoid creating a new class every time
 	private volatile static CallbackFilter callbackFilter;
 	
@@ -117,7 +124,11 @@ public class NetworkObjectInjector extends PlayerInjector {
 	}
 	
 	@Override
-	public UnsupportedListener checkListener(PacketListener listener) {
+	public UnsupportedListener checkListener(MinecraftVersion version, PacketListener listener) {
+		if (version != null && version.compareTo(safeVersion) > 0) {
+			return null;
+			
+		} else {
 			int[] unsupported = { Packets.Server.MAP_CHUNK, Packets.Server.MAP_CHUNK_BULK };
 			
 			// Unfortunately, we don't support chunk packets
@@ -127,6 +138,7 @@ public class NetworkObjectInjector extends PlayerInjector {
 				return null;
 			}
 		}
+	}
 	
 	@Override
 	public void injectManager() {

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkServerInjector.java

@@ -20,12 +20,16 @@ package com.comphenix.protocol.injector.player;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.Arrays;
+
 import net.sf.cglib.proxy.*;
 
 import org.bukkit.entity.Player;
 
 import com.comphenix.protocol.concurrency.IntegerSet;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.PacketListener;
 import com.comphenix.protocol.injector.GamePhase;
 import com.comphenix.protocol.injector.ListenerInvoker;
@@ -38,6 +42,7 @@ import com.comphenix.protocol.reflect.instances.DefaultInstances;
 import com.comphenix.protocol.reflect.instances.ExistingGenerator;
 import com.comphenix.protocol.utility.MinecraftMethods;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftVersion;
 
 /**
  * Represents a player hook into the NetServerHandler class. 
@@ -45,8 +50,13 @@ import com.comphenix.protocol.utility.MinecraftReflection;
  * @author Kristian
  */
 class NetworkServerInjector extends PlayerInjector {
+	// Disconnected field
+	public static final ReportType REPORT_ASSUMING_DISCONNECT_FIELD = new ReportType("Unable to find 'disconnected' field. Assuming %s.");
+	public static final ReportType REPORT_DISCONNECT_FIELD_MISSING = new ReportType("Cannot find disconnected field. Is ProtocolLib up to date?");
+	public static final ReportType REPORT_DISCONNECT_FIELD_FAILURE = new ReportType("Unable to update disconnected field. Player quit event may be sent twice.");
 	
 	private volatile static CallbackFilter callbackFilter;
+	private volatile static boolean foundSendPacket;
 	
 	private volatile static Field disconnectField;
 	private InjectedServerConnection serverInjection;
@@ -168,11 +178,13 @@ class NetworkServerInjector extends PlayerInjector {
 			callbackFilter = new CallbackFilter() {
 				@Override
 				public int accept(Method method) {
-					if (method.equals(sendPacket))
+					if (isCallableEqual(sendPacket, method)) {
+						foundSendPacket = true;
 						return 0;
-					else
+					} else {
 						return 1;
 					}
+				}
 			};
 		}
 		
@@ -204,8 +216,10 @@ class NetworkServerInjector extends PlayerInjector {
 		
 		// Inject it now
 		if (proxyObject != null) {
-			// This will be done by InjectedServerConnection instead
+			// Did we override a sendPacket method?
-			//copyTo(serverHandler, proxyObject);
+			if (!foundSendPacket) {
+				throw new IllegalArgumentException("Unable to find a sendPacket method in " + serverClass);
+			}
 
 			serverInjection.replaceServerHandler(serverHandler, proxyObject);
 			serverHandlerRef.setValue(proxyObject);
@@ -215,6 +229,20 @@ class NetworkServerInjector extends PlayerInjector {
 		}
 	}
 	
+	/**
+	 * Determine if the two methods are equal in terms of call semantics.
+	 * <p>
+	 * Two methods are equal if they have the same name, parameter types and return type.
+	 * @param first - first method.
+	 * @param second - second method.
+	 * @return TRUE if they are, FALSE otherwise.
+	 */
+	private boolean isCallableEqual(Method first, Method second) {
+		return first.getName().equals(second.getName()) &&
+			   first.getReturnType().equals(second.getReturnType()) &&
+			   Arrays.equals(first.getParameterTypes(), second.getParameterTypes());
+	}
+	
 	private Object getProxyServerHandler() {
 		if (proxyServerField != null && !proxyServerField.equals(serverHandlerRef.getField())) {
 			try {
@@ -228,7 +256,7 @@ class NetworkServerInjector extends PlayerInjector {
 	}
 	
 	private Class<?> getFirstMinecraftSuperClass(Class<?> clazz) {
-		if (clazz.getName().startsWith(MinecraftReflection.getMinecraftPackage()))
+		if (MinecraftReflection.isMinecraftClass(clazz))
 			return clazz;
 		else if (clazz.equals(Object.class))
 			return clazz;
@@ -288,7 +316,7 @@ class NetworkServerInjector extends PlayerInjector {
 			// Assume it's the first ...
 			if (disconnectField == null) {
 				disconnectField = FuzzyReflection.fromObject(handler).getFieldByType("disconnected", boolean.class);
-				reporter.reportWarning(this, "Unable to find 'disconnected' field. Assuming " + disconnectField);
+				reporter.reportWarning(this, Report.newBuilder(REPORT_ASSUMING_DISCONNECT_FIELD).messageParam(disconnectField));
 				
 				// Try again
 				if (disconnectField != null) {
@@ -298,15 +326,15 @@ class NetworkServerInjector extends PlayerInjector {
 			}
 			
 			// This is really bad
-			reporter.reportDetailed(this, "Cannot find disconnected field. Is ProtocolLib up to date?", e);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_DISCONNECT_FIELD_MISSING).error(e));
 				
 		} catch (IllegalAccessException e) {
-			reporter.reportWarning(this, "Unable to update disconnected field. Player quit event may be sent twice.");
+			reporter.reportWarning(this, Report.newBuilder(REPORT_DISCONNECT_FIELD_FAILURE).error(e));
 		}
 	}
 	
 	@Override
-	public UnsupportedListener checkListener(PacketListener listener) {
+	public UnsupportedListener checkListener(MinecraftVersion version, PacketListener listener) {
 		// We support everything
 		return null;
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjectionHandler.java

@@ -126,11 +126,18 @@ public interface PlayerInjectionHandler {
 	 * @throws IllegalAccessException If the reflection machinery failed.
 	 * @throws InvocationTargetException If the underlying method caused an error.
 	 */
-	public abstract void processPacket(Player player, Object mcPacket)
+	public abstract void recieveClientPacket(Player player, Object mcPacket)
 			throws IllegalAccessException, InvocationTargetException;
 
+	/**
+	 * Ensure that packet readers are informed of this player reference.
+	 * @param player - the player to update.
+	 */
+	public abstract void updatePlayer(Player player);
+	
 	/**
 	 * Determine if the given listeners are valid.
+	 * @param version - the current Minecraft version, or NULL if unknown.
 	 * @param listeners - listeners to check.
 	 */
 	public abstract void checkListener(Set<PacketListener> listeners);
@@ -139,6 +146,7 @@ public interface PlayerInjectionHandler {
 	 * Determine if a listener is valid or not.
 	 * <p>
 	 * If not, a warning will be printed to the console. 
+	 * @param version - the current Minecraft version, or NULL if unknown.
 	 * @param listener - listener to check.
 	 */
 	public abstract void checkListener(PacketListener listener);

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjector.java

@@ -30,6 +30,8 @@ import org.bukkit.entity.Player;
 
 import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.events.PacketListener;
@@ -43,8 +45,23 @@ import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.reflect.VolatileField;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftVersion;
 
-abstract class PlayerInjector implements SocketInjector {
+public abstract class PlayerInjector implements SocketInjector {
+	// Disconnect method related reports
+	public static final ReportType REPORT_ASSUME_DISCONNECT_METHOD = new ReportType("Cannot find disconnect method by name. Assuming %s.");
+	public static final ReportType REPORT_INVALID_ARGUMENT_DISCONNECT = new ReportType("Invalid argument passed to disconnect method: %s");
+	public static final ReportType REPORT_CANNOT_ACCESS_DISCONNECT = new ReportType("Unable to access disconnect method.");
+	
+	public static final ReportType REPORT_CANNOT_CLOSE_SOCKET = new ReportType("Unable to close socket.");
+	public static final ReportType REPORT_ACCESS_DENIED_CLOSE_SOCKET = new ReportType("Insufficient permissions. Cannot close socket.");
+	
+	public static final ReportType REPORT_DETECTED_CUSTOM_SERVER_HANDLER = 
+			new ReportType("Detected server handler proxy type by another plugin. Conflict may occur!");
+	public static final ReportType REPORT_CANNOT_PROXY_SERVER_HANDLER = new ReportType("Unable to load server handler from proxy type.");
+	
+	public static final ReportType REPORT_CANNOT_UPDATE_PLAYER = new ReportType("Cannot update player in PlayerEvent.");
+	public static final ReportType REPORT_CANNOT_HANDLE_PACKET = new ReportType("Cannot handle server packet.");
 	
 	// Net login handler stuff
 	private static Field netLoginNetworkField;
@@ -304,7 +321,7 @@ abstract class PlayerInjector implements SocketInjector {
 				} catch (IllegalArgumentException e) {
 					// Just assume it's the first String method
 					disconnect = FuzzyReflection.fromObject(handler).getMethodByParameters("disconnect", String.class);
-					reporter.reportWarning(this, "Cannot find disconnect method by name. Assuming " + disconnect);
+					reporter.reportWarning(this, Report.newBuilder(REPORT_ASSUME_DISCONNECT_METHOD).messageParam(disconnect));
 				}
 				
 				// Save the method for later
@@ -318,9 +335,9 @@ abstract class PlayerInjector implements SocketInjector {
 				disconnect.invoke(handler, message);
 				return;
 			} catch (IllegalArgumentException e) {
-				reporter.reportDetailed(this, "Invalid argument passed to disconnect method: " + message, e, handler);
+				reporter.reportDetailed(this, Report.newBuilder(REPORT_INVALID_ARGUMENT_DISCONNECT).error(e).messageParam(message).callerParam(handler));
 			} catch (IllegalAccessException e) {
-				reporter.reportWarning(this, "Unable to access disconnect method.", e);
+				reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_ACCESS_DISCONNECT).error(e));
 			}
 		}
 		
@@ -331,16 +348,15 @@ abstract class PlayerInjector implements SocketInjector {
 			try {
 				socket.close();
 			} catch (IOException e) {
-				reporter.reportDetailed(this, "Unable to close socket.", e, socket);
+				reporter.reportDetailed(this, Report.newBuilder(REPORT_CANNOT_CLOSE_SOCKET).error(e).callerParam(socket));
 			}
 			
 		} catch (IllegalAccessException e) {
-			reporter.reportWarning(this, "Insufficient permissions. Cannot close socket.", e);
+			reporter.reportWarning(this, Report.newBuilder(REPORT_ACCESS_DENIED_CLOSE_SOCKET).error(e));
 		}
 	}
 	
 	private Field getProxyField(Object notchEntity, Field serverField) {
-
 		try {
 			Object handler = FieldUtils.readField(serverHandlerField, notchEntity, true);
 			
@@ -352,7 +368,7 @@ abstract class PlayerInjector implements SocketInjector {
 					return null;
 				
 				hasProxyType = true;
-				reporter.reportWarning(this, "Detected server handler proxy type by another plugin. Conflict may occur!");
+				reporter.reportWarning(this, Report.newBuilder(REPORT_DETECTED_CUSTOM_SERVER_HANDLER).callerParam(serverField));
 				
 				// No? Is it a Proxy type?
 				try {
@@ -367,7 +383,7 @@ abstract class PlayerInjector implements SocketInjector {
 			}
 			
 		} catch (IllegalAccessException e) {
-			reporter.reportWarning(this, "Unable to load server handler from proxy type.");
+			reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_PROXY_SERVER_HANDLER).error(e).callerParam(notchEntity, serverField));
 		}
 
 		// Nope, just go with it
@@ -508,11 +524,13 @@ abstract class PlayerInjector implements SocketInjector {
 	 * Invoked before a new listener is registered.
 	 * <p>
 	 * The player injector should only return a non-null value if some or all of the packet IDs are unsupported.
+	 * @param version 
 	 * 
+	 * @param version - the current Minecraft version, or NULL if unknown.
 	 * @param listener - the listener that is about to be registered.
 	 * @return A error message with the unsupported packet IDs, or NULL if this listener is valid.
 	 */
-	public abstract UnsupportedListener checkListener(PacketListener listener);
+	public abstract UnsupportedListener checkListener(MinecraftVersion version, PacketListener listener);
 	
 	/**
 	 * Allows a packet to be sent by the listeners.
@@ -531,7 +549,7 @@ abstract class PlayerInjector implements SocketInjector {
 					try {
 						updatedPlayer = (Player) MinecraftReflection.getBukkitEntity(getEntityPlayer(getNetHandler()));
 					} catch (IllegalAccessException e) {
-						reporter.reportDetailed(this, "Cannot update player in PlayerEvent.", e, packet);
+						reporter.reportDetailed(this, Report.newBuilder(REPORT_CANNOT_UPDATE_PLAYER).error(e).callerParam(packet));
 					}
 				}
 				
@@ -556,7 +574,7 @@ abstract class PlayerInjector implements SocketInjector {
 			}
 			
 		} catch (Throwable e) {
-			reporter.reportDetailed(this, "Cannot handle server packet.", e, packet);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_CANNOT_HANDLE_PACKET).error(e).callerParam(packet));
 		}
 		
 		return packet;
@@ -639,10 +657,7 @@ abstract class PlayerInjector implements SocketInjector {
 		// Do nothing
 	}
 	
-	/**
+	@Override
-	 * Set the real Bukkit player that we will use.
-	 * @param updatedPlayer - the real Bukkit player.
-	 */
 	public void setUpdatedPlayer(Player updatedPlayer) {
 		this.updatedPlayer = updatedPlayer;
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjectorBuilder.java

@@ -14,6 +14,7 @@ import com.comphenix.protocol.events.PacketListener;
 import com.comphenix.protocol.injector.GamePhase;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.PacketFilterManager;
+import com.comphenix.protocol.utility.MinecraftVersion;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Predicate;
 
@@ -37,6 +38,7 @@ public class PlayerInjectorBuilder {
 	protected ListenerInvoker invoker;
 	protected Set<PacketListener> packetListeners;
 	protected Server server;
+	protected MinecraftVersion version;
 
 	/**
 	 * Set the class loader to use during class generation.
@@ -107,6 +109,16 @@ public class PlayerInjectorBuilder {
 		return this;
 	}
 	
+	/**
+	 * Set the current Minecraft version.
+	 * @param server - the current Minecraft version, or NULL if unknown.
+	 * @return This builder, for chaining.
+	 */
+	public PlayerInjectorBuilder version(MinecraftVersion version) {
+		this.version = version;
+		return this;
+	}
+	
 	/**
 	 * Called before an object is created with this builder.
 	 */
@@ -140,6 +152,6 @@ public class PlayerInjectorBuilder {
 		
 		return new ProxyPlayerInjectionHandler(
 				classLoader, reporter, injectionFilter, 
-				invoker, packetListeners, server);
+				invoker, packetListeners, server, version);
 	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/ProxyPlayerInjectionHandler.java

@@ -34,6 +34,8 @@ import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.concurrency.BlockingHashMap;
 import com.comphenix.protocol.concurrency.IntegerSet;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.PacketAdapter;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketListener;
@@ -42,9 +44,11 @@ import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.PlayerLoggedOutException;
 import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
 import com.comphenix.protocol.injector.server.AbstractInputStreamLookup;
+import com.comphenix.protocol.injector.server.BukkitSocketInjector;
 import com.comphenix.protocol.injector.server.InputStreamLookupBuilder;
 import com.comphenix.protocol.injector.server.SocketInjector;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftVersion;
 
 import com.google.common.base.Predicate;
 import com.google.common.cache.Cache;
@@ -57,6 +61,16 @@ import com.google.common.collect.Maps;
  * @author Kristian
  */
 class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
+	// Warnings and errors
+	public static final ReportType REPORT_UNSUPPPORTED_LISTENER = new ReportType("Cannot fully register listener for %s: %s");
+	
+	// Fallback to older player hook types
+	public static final ReportType REPORT_PLAYER_HOOK_FAILED = new ReportType("Player hook %s failed.");
+	public static final ReportType REPORT_SWITCHED_PLAYER_HOOK = new ReportType("Switching to %s instead.");
+	
+	public static final ReportType REPORT_HOOK_CLEANUP_FAILED = new ReportType("Cleaing up after player hook failed.");
+	public static final ReportType REPORT_CANNOT_REVERT_HOOK = new ReportType("Unable to fully revert old injector. May cause conflicts.");
+	
 	// Server connection injection
 	private InjectedServerConnection serverInjection;
 	
@@ -91,6 +105,9 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 	// Used to invoke events
 	private ListenerInvoker invoker;
 	
+	// Current Minecraft version
+	private MinecraftVersion version;
+	
 	// Enabled packet filters
 	private IntegerSet sendingFilters = new IntegerSet(Packets.MAXIMUM_PACKET_ID + 1);
 	
@@ -105,13 +122,14 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 	
 	public ProxyPlayerInjectionHandler(
 			ClassLoader classLoader, ErrorReporter reporter, Predicate<GamePhase> injectionFilter, 
-			ListenerInvoker invoker, Set<PacketListener> packetListeners, Server server) {
+			ListenerInvoker invoker, Set<PacketListener> packetListeners, Server server, MinecraftVersion version) {
 		
 		this.classLoader = classLoader;
 		this.reporter = reporter;
 		this.invoker = invoker;
 		this.injectionFilter = injectionFilter;
 		this.packetListeners = packetListeners;
+		this.version = version;
 	
 		this.inputStreamLookup = InputStreamLookupBuilder.newBuilder().
 							  server(server).
@@ -349,8 +367,9 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 					
 				} catch (Exception e) {
 					// Mark this injection attempt as a failure
-					reporter.reportDetailed(this, "Player hook " + tempHook.toString() + " failed.", 
+					reporter.reportDetailed(this, 
-											 e, player, injectionPoint, phase);
+							Report.newBuilder(REPORT_PLAYER_HOOK_FAILED).messageParam(tempHook).callerParam(player, injectionPoint, phase).error(e) 
+					);
 					hookFailed = true;
 				}
 				
@@ -358,7 +377,7 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 				tempHook = PlayerInjectHooks.values()[tempHook.ordinal() - 1];
 				
 				if (hookFailed)
-					reporter.reportWarning(this, "Switching to " + tempHook.toString() + " instead.");
+					reporter.reportWarning(this, Report.newBuilder(REPORT_SWITCHED_PLAYER_HOOK).messageParam(tempHook));
 				
 				// Check for UTTER FAILURE
 				if (tempHook == PlayerInjectHooks.NONE) {
@@ -394,7 +413,7 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 			if (injector != null)
 				injector.cleanupAll();
 		} catch (Exception ex) {
-			reporter.reportDetailed(this, "Cleaing up after player hook failed.", ex, injector);
+			reporter.reportDetailed(this, Report.newBuilder(REPORT_HOOK_CLEANUP_FAILED).callerParam(injector).error(ex));
 		}
 	}
 	
@@ -411,6 +430,18 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 		}
 	}
 	
+	@Override
+	public void updatePlayer(Player player) {
+		SocketInjector injector = inputStreamLookup.peekSocketInjector(player.getAddress());
+		
+		if (injector != null) {
+			injector.setUpdatedPlayer(player);
+		} else {
+			inputStreamLookup.setSocketInjector(player.getAddress(), 
+					new BukkitSocketInjector(player));
+		}
+	}
+	
 	/**
 	 * Unregisters the given player.
 	 * @param player - player to unregister.
@@ -444,7 +475,7 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 
 					} catch (IllegalAccessException e) {
 						// Let the user know
-						reporter.reportWarning(this, "Unable to fully revert old injector. May cause conflicts.", e);
+						reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_REVERT_HOOK).error(e));
 					}
 				}
 				
@@ -501,14 +532,14 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 	}
 	
 	/**
-	 * Process a packet as if it were sent by the given player.
+	 * Recieve a packet as if it were sent by the given player.
 	 * @param player - the sender.
 	 * @param mcPacket - the packet to process.
 	 * @throws IllegalAccessException If the reflection machinery failed.
 	 * @throws InvocationTargetException If the underlying method caused an error.
 	 */
 	@Override
-	public void processPacket(Player player, Object mcPacket) throws IllegalAccessException, InvocationTargetException {
+	public void recieveClientPacket(Player player, Object mcPacket) throws IllegalAccessException, InvocationTargetException {
 		PlayerInjector injector = getInjector(player);
 		
 		// Process the given packet, or simply give up
@@ -532,6 +563,11 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 		if (injector == null) {
 			// Try getting it from the player itself
 			SocketAddress address = player.getAddress();
+			
+			// Must have logged out - there's nothing we can do
+			if (address == null)
+				return null;
+			
 			// Look that up without blocking
 			SocketInjector result = inputStreamLookup.peekSocketInjector(address);
 
@@ -619,12 +655,13 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 	@Override
 	public void checkListener(PacketListener listener) {
 		if (lastSuccessfulHook != null) {
-			UnsupportedListener result = lastSuccessfulHook.checkListener(listener);
+			UnsupportedListener result = lastSuccessfulHook.checkListener(version, listener);
 
 			// We won't prevent the listener, as it may still have valid packets
 			if (result != null) {
-				reporter.reportWarning(this, "Cannot fully register listener for " + 
+				reporter.reportWarning(this, 
-						  PacketAdapter.getPluginName(listener) + ": " + result.toString());
+						Report.newBuilder(REPORT_UNSUPPPORTED_LISTENER).messageParam(PacketAdapter.getPluginName(listener), result) 
+				);
 				
 				// These are illegal
 				for (int packetID : result.getPackets())

ProtocolLib/src/main/java/com/comphenix/protocol/injector/server/AbstractInputStreamLookup.java

@@ -1,22 +1,14 @@
 package com.comphenix.protocol.injector.server;
 
-import java.io.FilterInputStream;
 import java.io.InputStream;
-import java.lang.reflect.Field;
 import java.net.Socket;
 import java.net.SocketAddress;
 import org.bukkit.Server;
 import org.bukkit.entity.Player;
 
 import com.comphenix.protocol.error.ErrorReporter;
-import com.comphenix.protocol.reflect.FieldAccessException;
-import com.comphenix.protocol.reflect.FieldUtils;
-import com.comphenix.protocol.reflect.FuzzyReflection;
 
 public abstract class AbstractInputStreamLookup {
-	// Used to access the inner input stream of a filtered input stream
-	private static Field filteredInputField;
-
 	// Error reporter
 	protected final ErrorReporter reporter;
 	
@@ -28,30 +20,6 @@ public abstract class AbstractInputStreamLookup {
 		this.server = server;
 	}
 
-	/**
-	 * Retrieve the underlying input stream that is associated with a given filter input stream.
-	 * @param filtered - the filter input stream.
-	 * @return The underlying input stream that is being filtered.
-	 * @throws FieldAccessException Unable to access input stream.
-	 */
-	protected static InputStream getInputStream(FilterInputStream filtered) {
-		if (filteredInputField == null)
-			filteredInputField = FuzzyReflection.fromClass(FilterInputStream.class, true).
-								  getFieldByType("in", InputStream.class);
-		
-		InputStream current = filtered;
-		
-		try {
-			// Iterate until we find the real input stream
-			while (current instanceof FilterInputStream) {
-				current = (InputStream) FieldUtils.readField(filteredInputField, current, true);
-			}
-			return current;
-		} catch (IllegalAccessException e) {
-			throw new FieldAccessException("Cannot access filtered input field.", e);
-		}
-	}
-
 	/**
 	 * Inject the given server thread or dedicated connection.
 	 * @param container - class that contains a ServerSocket field.

ProtocolLib/src/main/java/com/comphenix/protocol/injector/server/BukkitSocketInjector.java

@@ -0,0 +1,103 @@
+package com.comphenix.protocol.injector.server;
+
+import java.lang.reflect.InvocationTargetException;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.bukkit.entity.Player;
+
+public class BukkitSocketInjector implements SocketInjector {
+	/**
+	 * Represents a single send packet command.
+	 * @author Kristian
+	 */
+	static class SendPacketCommand {
+		private final Object packet;
+		private final boolean filtered;
+		
+		public SendPacketCommand(Object packet, boolean filtered) {
+			this.packet = packet;
+			this.filtered = filtered;
+		}
+
+		public Object getPacket() {
+			return packet;
+		}
+
+		public boolean isFiltered() {
+			return filtered;
+		}
+	}
+	
+	private Player player;
+	
+	// Queue of server packets
+	private List<SendPacketCommand> syncronizedQueue = Collections.synchronizedList(new ArrayList<SendPacketCommand>());
+	
+	/**
+	 * Represents a temporary socket injector.
+	 * @param temporaryPlayer - 
+	 */
+	public BukkitSocketInjector(Player player) {
+		if (player == null)
+			throw new IllegalArgumentException("Player cannot be NULL.");
+		this.player = player;
+	}
+
+	@Override
+	public Socket getSocket() throws IllegalAccessException {
+		throw new UnsupportedOperationException("Cannot get socket from Bukkit player.");
+	}
+
+	@Override
+	public SocketAddress getAddress() throws IllegalAccessException {
+		return player.getAddress();
+	}
+
+	@Override
+	public void disconnect(String message) throws InvocationTargetException {
+		player.kickPlayer(message);
+	}
+
+	@Override
+	public void sendServerPacket(Object packet, boolean filtered)
+			throws InvocationTargetException {
+		SendPacketCommand command = new SendPacketCommand(packet, filtered);
+		
+		// Queue until we can find something better
+		syncronizedQueue.add(command);
+	}
+	
+	@Override
+	public Player getPlayer() {
+		return player;
+	}
+
+	@Override
+	public Player getUpdatedPlayer() {
+		return player;
+	}
+
+	@Override
+	public void transferState(SocketInjector delegate) {
+		// Transmit all queued packets to a different injector.
+		try {
+			synchronized(syncronizedQueue) {
+			    for (SendPacketCommand command : syncronizedQueue) {
+					delegate.sendServerPacket(command.getPacket(), command.isFiltered());
+			    }
+			    syncronizedQueue.clear();
+			}
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Unable to transmit packets to " + delegate + " from old injector.", e);
+		}
+	}
+
+	@Override
+	public void setUpdatedPlayer(Player updatedPlayer) {
+		this.player = updatedPlayer;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/server/InputStreamReflectLookup.java

@@ -18,6 +18,9 @@ import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.google.common.collect.MapMaker;
 
 class InputStreamReflectLookup extends AbstractInputStreamLookup {
+	// Used to access the inner input stream of a filtered input stream
+	private static Field filteredInputField;
+	
 	// The default lookup timeout
 	private static final long DEFAULT_TIMEOUT = 2000; // ms
 	
@@ -123,6 +126,30 @@ class InputStreamReflectLookup extends AbstractInputStreamLookup {
 		return result;
 	}
 	
+	/**
+	 * Retrieve the underlying input stream that is associated with a given filter input stream.
+	 * @param filtered - the filter input stream.
+	 * @return The underlying input stream that is being filtered.
+	 * @throws FieldAccessException Unable to access input stream.
+	 */
+	protected static InputStream getInputStream(FilterInputStream filtered) {
+		if (filteredInputField == null)
+			filteredInputField = FuzzyReflection.fromClass(FilterInputStream.class, true).
+								  getFieldByType("in", InputStream.class);
+		
+		InputStream current = filtered;
+		
+		try {
+			// Iterate until we find the real input stream
+			while (current instanceof FilterInputStream) {
+				current = (InputStream) FieldUtils.readField(filteredInputField, current, true);
+			}
+			return current;
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Cannot access filtered input field.", e);
+		}
+	}
+	
 	@Override
 	public void setSocketInjector(SocketAddress address, SocketInjector injector) {
 		if (address == null)

ProtocolLib/src/main/java/com/comphenix/protocol/injector/server/SocketInjector.java

@@ -58,4 +58,10 @@ public interface SocketInjector {
 	 * @param delegate - the new injector.
 	 */
 	public abstract void transferState(SocketInjector delegate);
+
+	/**
+	 * Set the real Bukkit player that we will use.
+	 * @param updatedPlayer - the real Bukkit player.
+	 */
+	public abstract void setUpdatedPlayer(Player updatedPlayer);
 }

ProtocolLib/src/main/java/com/comphenix/protocol/injector/server/TemporaryPlayerFactory.java

@@ -102,6 +102,8 @@ public class TemporaryPlayerFactory {
 					throw new IllegalStateException("Unable to find injector.");
 				
 				// Use the socket to get the address
+				if (methodName.equalsIgnoreCase("isOnline"))
+					return injector.getSocket() != null && injector.getSocket().isConnected();
 				if (methodName.equalsIgnoreCase("getName"))
 					return "UNKNOWN[" + injector.getSocket().getRemoteSocketAddress() + "]";
 				if (methodName.equalsIgnoreCase("getPlayer"))

ProtocolLib/src/main/java/com/comphenix/protocol/injector/spigot/DummyPlayerHandler.java

@@ -74,7 +74,7 @@ class DummyPlayerHandler implements PlayerInjectionHandler {
 	}
 
 	@Override
-	public void processPacket(Player player, Object mcPacket) throws IllegalAccessException, InvocationTargetException {
+	public void recieveClientPacket(Player player, Object mcPacket) throws IllegalAccessException, InvocationTargetException {
 		injector.processPacket(player, mcPacket);
 	}
 	
@@ -119,4 +119,9 @@ class DummyPlayerHandler implements PlayerInjectionHandler {
 	public void postWorldLoaded() {
 		// Do nothing
 	}
+
+	@Override
+	public void updatePlayer(Player player) {
+		// Do nothing
+	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/injector/spigot/SpigotPacketInjector.java

@@ -22,7 +22,9 @@ import net.sf.cglib.proxy.NoOp;
 
 import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.concurrency.IntegerSet;
+import com.comphenix.protocol.error.DelegatedErrorReporter;
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.injector.ListenerInvoker;
@@ -47,7 +49,7 @@ public class SpigotPacketInjector implements SpigotPacketListener {
 	private static volatile boolean classChecked;
 	
 	// Retrieve the entity player from a PlayerConnection
-	private static Field playerConnectionPlayer;
+	private static volatile Field playerConnectionPlayer;
 	
 	// Packets that are not to be processed by the filters
 	private Set<Object> ignoredPackets = Collections.newSetFromMap(new MapMaker().weakKeys().<Object, Boolean>makeMap());
@@ -275,7 +277,8 @@ public class SpigotPacketInjector implements SpigotPacketListener {
 		if (dummyInjector == null) {
 			// Inject the network manager
 			try {
-				NetworkObjectInjector created = new NetworkObjectInjector(classLoader, reporter, null, invoker, null);
+				NetworkObjectInjector created = new NetworkObjectInjector(
+						classLoader, filterImpossibleWarnings(reporter), null, invoker, null);
 				
 				if (MinecraftReflection.isLoginHandler(connection)) {
 					created.initialize(connection);
@@ -303,6 +306,23 @@ public class SpigotPacketInjector implements SpigotPacketListener {
 		return dummyInjector;
 	}
 
+	/**
+	 * Return a delegated error reporter that ignores certain warnings that are irrelevant on Spigot.
+	 * @param reporter - error reporter to delegate.
+	 * @return The filtered error reporter.
+	 */
+	private ErrorReporter filterImpossibleWarnings(ErrorReporter reporter) {
+		return new DelegatedErrorReporter(reporter) {
+			@Override
+			protected Report filterReport(Object sender, Report report, boolean detailed) {
+				// This doesn't matter - ignore it
+				if (report.getType() == NetworkObjectInjector.REPORT_DETECTED_CUSTOM_SERVER_HANDLER)
+					return null;
+				return report;
+			}
+		};
+	}
+	
 	/**
 	 * Save a given player injector for later.
 	 * @param networkManager - the associated network manager.
@@ -400,7 +420,8 @@ public class SpigotPacketInjector implements SpigotPacketListener {
 	 */
 	void injectPlayer(Player player) {
 		try {
-			NetworkObjectInjector dummy = new NetworkObjectInjector(classLoader, reporter, player, invoker, null);
+			NetworkObjectInjector dummy = new NetworkObjectInjector(
+					classLoader, filterImpossibleWarnings(reporter), player, invoker, null);
 			dummy.initializePlayer(player);
 			
 			// Save this player for the network manager

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/compiler/BackgroundCompiler.java

@@ -29,9 +29,9 @@ import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 
-import javax.annotation.Nullable;
-
 import com.comphenix.protocol.error.ErrorReporter;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.reflect.compiler.StructureCompiler.StructureKey;
 import com.google.common.collect.Lists;
@@ -46,6 +46,8 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
  * @author Kristian
  */
 public class BackgroundCompiler {
+	public static final ReportType REPORT_CANNOT_COMPILE_STRUCTURE_MODIFIER = new ReportType("Cannot compile structure. Disabing compiler.");
+	public static final ReportType REPORT_CANNOT_SCHEDULE_COMPILATION = new ReportType("Unable to schedule compilation task.");
 	
 	/**
 	 * The default format for the name of new worker threads.
@@ -118,11 +120,13 @@ public class BackgroundCompiler {
 	}
 
 	// Avoid "Constructor call must be the first statement".
-	private void initializeCompiler(ClassLoader loader, @Nullable ErrorReporter reporter, ExecutorService executor) {
+	private void initializeCompiler(ClassLoader loader, ErrorReporter reporter, ExecutorService executor) {
 		if (loader == null)
 			throw new IllegalArgumentException("loader cannot be NULL");
 		if (executor == null)
 			throw new IllegalArgumentException("executor cannot be NULL");
+		if (reporter == null)
+			throw new IllegalArgumentException("reporter cannot be NULL.");
 		
 		this.compiler = new StructureCompiler(loader);
 		this.reporter = reporter;
@@ -198,6 +202,11 @@ public class BackgroundCompiler {
 						
 						synchronized (listenerLock) {
 							list = listeners.get(key);
+							
+							// Prevent ConcurrentModificationExceptions
+							if (list != null) {
+								list = Lists.newArrayList(list);
+							}
 						}
 						
 						// Only execute the listeners if there is a list
@@ -217,13 +226,9 @@ public class BackgroundCompiler {
 						setEnabled(false);
 						
 						// Inform about this error as best as we can
-						if (reporter != null) {
 						reporter.reportDetailed(BackgroundCompiler.this,
-									"Cannot compile structure. Disabing compiler.", e, uncompiled);
+								Report.newBuilder(REPORT_CANNOT_COMPILE_STRUCTURE_MODIFIER).callerParam(uncompiled).error(e)
-						} else {
+						);
-							System.err.println("Exception occured in structure compiler: ");
-							e.printStackTrace();
-						}
 					}
 					
 					// We'll also return the new structure modifier
@@ -253,7 +258,7 @@ public class BackgroundCompiler {
 				// Occures when the underlying queue is overflowing. Since the compilation  
 				// is only an optmization and not really essential we'll just log this failure 
 				// and move on.
-				reporter.reportWarning(this, "Unable to schedule compilation task.", e);
+				reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_SCHEDULE_COMPILATION).error(e));
 			}
 		}
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/compiler/StructureCompiler.java

@@ -26,6 +26,8 @@ import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.reflect.StructureModifier;
 import com.google.common.base.Objects;
 import com.google.common.primitives.Primitives;
@@ -92,6 +94,7 @@ import net.sf.cglib.asm.*;
  * @author Kristian
  */
 public final class StructureCompiler {
+	public static final ReportType REPORT_TOO_MANY_GENERATED_CLASSES = new ReportType("Generated too many classes (count: %s)");
 	
 	// Used to store generated classes of different types
 	@SuppressWarnings("rawtypes")
@@ -210,7 +213,8 @@ public final class StructureCompiler {
 		} catch (OutOfMemoryError e) {
 			// Print the number of generated classes by the current instances
 			ProtocolLibrary.getErrorReporter().reportWarning(
-					this, "May have generated too many classes (count: " + compiledCache.size() + ")");
+				this, Report.newBuilder(REPORT_TOO_MANY_GENERATED_CLASSES).messageParam(compiledCache.size())
+			);
 			throw e;
 		} catch (IllegalArgumentException e) {
 			throw new IllegalStateException("Used invalid parameters in instance creation", e);

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/fuzzy/AbstractFuzzyMatcher.java

@@ -63,6 +63,25 @@ public abstract class AbstractFuzzyMatcher<T> implements Comparable<AbstractFuzz
 			return Math.max(roundA, roundB);
 	}
 	
+	/**
+	 * Combine n round numbers by taking the highest non-zero number, or return zero.
+	 * @param rounds - the round numbers.
+	 * @return The combined round number.
+	 */
+	protected final int combineRounds(Integer... rounds) {
+		if (rounds.length < 2)
+			throw new IllegalArgumentException("Must supply at least two arguments.");
+		
+		// Get the seed
+		int reduced = combineRounds(rounds[0], rounds[1]);
+		
+		// Aggregate it all 
+		for (int i = 2; i < rounds.length; i++) {
+			reduced = combineRounds(reduced, rounds[i]);
+		}
+		return reduced;
+	}
+		
 	@Override
 	public int compareTo(AbstractFuzzyMatcher<T> obj) {
 		if (obj instanceof AbstractFuzzyMatcher) {

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/fuzzy/FuzzyClassContract.java

@@ -1,6 +1,7 @@
 package com.comphenix.protocol.reflect.fuzzy;
 
 import java.lang.reflect.Field;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -23,6 +24,9 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 	private final ImmutableList<AbstractFuzzyMatcher<MethodInfo>> methodContracts;
 	private final ImmutableList<AbstractFuzzyMatcher<MethodInfo>> constructorContracts;
 	
+	private final ImmutableList<AbstractFuzzyMatcher<Class<?>>> baseclassContracts;
+	private final ImmutableList<AbstractFuzzyMatcher<Class<?>>> interfaceContracts;
+	
 	/**
 	 * Represents a class contract builder.
 	 * @author Kristian
@@ -33,6 +37,9 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 		private List<AbstractFuzzyMatcher<MethodInfo>> methodContracts = Lists.newArrayList();
 		private List<AbstractFuzzyMatcher<MethodInfo>> constructorContracts = Lists.newArrayList();
 		
+		private List<AbstractFuzzyMatcher<Class<?>>> baseclassContracts = Lists.newArrayList();
+		private List<AbstractFuzzyMatcher<Class<?>>> interfaceContracts = Lists.newArrayList();
+		
 		/**
 		 * Add a new field contract.
 		 * @param matcher - new field contract.
@@ -90,17 +97,53 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 			return constructor(builder.build());
 		}
 		
+		/**
+		 * Add a new base class contract.
+		 * @param matcher - new base class contract.
+		 * @return This builder, for chaining.
+		 */
+		public Builder baseclass(AbstractFuzzyMatcher<Class<?>> matcher) {
+			baseclassContracts.add(matcher);
+			return this;
+		}
+		
+		/**
+		 * Add a new base class contract.
+		 * @param matcher - builder for the new base class contract.
+		 * @return This builder, for chaining.
+		 */
+		public Builder baseclass(FuzzyClassContract.Builder builder) {
+			return baseclass(builder.build());
+		}
+		
+		/**
+		 * Add a new interface contract.
+		 * @param matcher - new interface contract.
+		 * @return This builder, for chaining.
+		 */
+		public Builder interfaces(AbstractFuzzyMatcher<Class<?>> matcher) {
+			interfaceContracts.add(matcher);
+			return this;
+		}
+		
+		/**
+		 * Add a new interface contract.
+		 * @param matcher - builder for the new interface contract.
+		 * @return This builder, for chaining.
+		 */
+		public Builder interfaces(FuzzyClassContract.Builder builder) {
+			return interfaces(builder.build());
+		}
+
 		public FuzzyClassContract build() {
 			Collections.sort(fieldContracts);
 			Collections.sort(methodContracts);
 			Collections.sort(constructorContracts);
+			Collections.sort(baseclassContracts);
+			Collections.sort(interfaceContracts);
 			
 			// Construct a new class matcher
-			return new FuzzyClassContract(
+			return new FuzzyClassContract(this);
-						ImmutableList.copyOf(fieldContracts),
-						ImmutableList.copyOf(methodContracts),
-						ImmutableList.copyOf(constructorContracts)
-			);
 		}
 	}
 
@@ -114,17 +157,15 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 	
 	/**
 	 * Constructs a new fuzzy class contract with the given contracts.
-	 * @param fieldContracts - field contracts.
+	 * @param builder - the builder that is constructing us.
-	 * @param methodContracts - method contracts.
-	 * @param constructorContracts - constructor contracts.
 	 */
-	private FuzzyClassContract(ImmutableList<AbstractFuzzyMatcher<Field>> fieldContracts,
+	private FuzzyClassContract(Builder builder) {
-							   ImmutableList<AbstractFuzzyMatcher<MethodInfo>> methodContracts,
-							   ImmutableList<AbstractFuzzyMatcher<MethodInfo>> constructorContracts) {
 		super();
-		this.fieldContracts = fieldContracts;
+		this.fieldContracts = ImmutableList.copyOf(builder.fieldContracts);
-		this.methodContracts = methodContracts;
+		this.methodContracts = ImmutableList.copyOf(builder.methodContracts);
-		this.constructorContracts = constructorContracts;
+		this.constructorContracts = ImmutableList.copyOf(builder.constructorContracts);
+		this.baseclassContracts = ImmutableList.copyOf(builder.baseclassContracts);
+		this.interfaceContracts = ImmutableList.copyOf(builder.interfaceContracts);
 	}
 
 	/**
@@ -157,12 +198,34 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 		return constructorContracts;
 	}
 	
+	/**
+	 * Retrieve an immutable list of every baseclass contract.
+	 * <p>
+	 * This list is ordered in descending order of priority.
+	 * @return List of every baseclass contract.
+	 */
+	public ImmutableList<AbstractFuzzyMatcher<Class<?>>> getBaseclassContracts() {
+		return baseclassContracts;
+	}
+	
+	/**
+	 * Retrieve an immutable list of every interface contract.
+	 * <p>
+	 * This list is ordered in descending order of priority.
+	 * @return List of every interface contract.
+	 */
+	public ImmutableList<AbstractFuzzyMatcher<Class<?>>> getInterfaceContracts() {
+		return interfaceContracts;
+	}
+	
 	@Override
 	protected int calculateRoundNumber() {
 		// Find the highest round number
 		return combineRounds(findHighestRound(fieldContracts), 
-			   combineRounds(findHighestRound(methodContracts), 
+			    		     findHighestRound(methodContracts), 
-					    	 findHighestRound(constructorContracts)));
+					    	 findHighestRound(constructorContracts),
+					    	 findHighestRound(interfaceContracts),
+					    	 findHighestRound(baseclassContracts));
 	}
 	
 	private <T> int findHighestRound(Collection<AbstractFuzzyMatcher<T>> list) {
@@ -179,12 +242,19 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 		FuzzyReflection reflection = FuzzyReflection.fromClass(value, true);
 		
 		// Make sure all the contracts are valid
-		return processContracts(reflection.getFields(), value, fieldContracts) &&
+		return (fieldContracts.size() == 0 || 
-			   processContracts(MethodInfo.fromMethods(reflection.getMethods()), value, methodContracts) &&
+					processContracts(reflection.getFields(), value, fieldContracts)) &&
-			   processContracts(MethodInfo.fromConstructors(value.getDeclaredConstructors()), value, constructorContracts);
+			   (methodContracts.size() == 0 ||
+			   	 	processContracts(MethodInfo.fromMethods(reflection.getMethods()), value, methodContracts)) &&
+			   (constructorContracts.size() == 0 || 
+			   		processContracts(MethodInfo.fromConstructors(value.getDeclaredConstructors()), value, constructorContracts)) &&
+			   (baseclassContracts.size() == 0 || 
+			   		processValue(value.getSuperclass(), parent, baseclassContracts)) &&
+			   (interfaceContracts.size() == 0 ||
+			    	processContracts(Arrays.asList(value.getInterfaces()), (Class<?>) parent, interfaceContracts));
 	}
 
-	private <T> boolean processContracts(Collection<T> values, Class<?> parent, List<AbstractFuzzyMatcher<T>> matchers) {
+	private <T> boolean processContracts(Collection<T> values, Object parent, List<AbstractFuzzyMatcher<T>> matchers) {
 		boolean[] accepted = new boolean[matchers.size()];
 		int count = accepted.length;
 
@@ -205,7 +275,18 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 		return count == 0;
 	}
 	
-	private <T> int processValue(T value, Class<?> parent, boolean accepted[], List<AbstractFuzzyMatcher<T>> matchers) {
+	private <T> boolean processValue(T value, Object parent, List<AbstractFuzzyMatcher<T>> matchers) {
+		for (int i = 0; i < matchers.size(); i++) {
+			if (matchers.get(i).isMatch(value, parent)) {
+				return true;
+			}
+		}
+		
+		// No match
+		return false;
+	}
+	
+	private <T> int processValue(T value, Object parent, boolean accepted[], List<AbstractFuzzyMatcher<T>> matchers) {
 		// The order matters
 		for (int i = 0; i < matchers.size(); i++) {
 			if (!accepted[i]) {
@@ -235,6 +316,12 @@ public class FuzzyClassContract extends AbstractFuzzyMatcher<Class<?>> {
 		if (constructorContracts.size() > 0) {
 			params.put("constructors", constructorContracts);
 		}
+		if (baseclassContracts.size() > 0) {
+			params.put("baseclasses", baseclassContracts);
+		}
+		if (interfaceContracts.size() > 0) {
+			params.put("interfaces", interfaceContracts);
+		}
 		return "{\n  " + Joiner.on(", \n  ").join(params.entrySet()) + "\n}";
 	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/instances/DefaultInstances.java

@@ -327,6 +327,7 @@ public class DefaultInstances implements InstanceProvider {
 		try {
 			return (T) constructor.newInstance(params);
 		} catch (Exception e) {
+			//e.printStackTrace();
 			// Cannot create it
 			return null;
 		}

ProtocolLib/src/main/java/com/comphenix/protocol/utility/MinecraftReflection.java

@@ -81,6 +81,9 @@ public class MinecraftReflection {
 	private static Constructor<?> craftNMSConstructor;
 	private static Constructor<?> craftBukkitConstructor;
 	
+	// Matches classes
+	private static AbstractFuzzyMatcher<Class<?>> fuzzyMatcher;
+	
 	// New in 1.4.5
 	private static Method craftNMSMethod;
 	private static Method craftBukkitMethod;
@@ -89,6 +92,11 @@ public class MinecraftReflection {
 	// net.minecraft.server
 	private static Class<?> itemStackArrayClass;
 	
+	/**
+	 * Whether or not we're currently initializing the reflection handler.
+	 */
+	private static boolean initializing;
+	
 	private MinecraftReflection() {
 		// No need to make this constructable.
 	}
@@ -108,7 +116,9 @@ public class MinecraftReflection {
 	 * @return A matcher for Minecraft objects.
 	 */
 	public static AbstractFuzzyMatcher<Class<?>> getMinecraftObjectMatcher() {
-		return FuzzyMatchers.matchRegex(getMinecraftObjectRegex(), 50);
+		if (fuzzyMatcher == null)
+			fuzzyMatcher = FuzzyMatchers.matchRegex(getMinecraftObjectRegex(), 50);
+		return fuzzyMatcher;
 	}
 	
 	/**
@@ -119,6 +129,9 @@ public class MinecraftReflection {
 		// Speed things up
 		if (MINECRAFT_FULL_PACKAGE != null)
 			return MINECRAFT_FULL_PACKAGE;
+		if (initializing)
+			throw new IllegalStateException("Already initializing minecraft package!");
+		initializing = true;
 		
 		Server craftServer = Bukkit.getServer();
 		
@@ -129,6 +142,9 @@ public class MinecraftReflection {
 				Class<?> craftClass = craftServer.getClass();
 				CRAFTBUKKIT_PACKAGE = getPackage(craftClass.getCanonicalName());
 				
+				// Libigot patch
+				handleLibigot();
+				
 				// Next, do the same for CraftEntity.getHandle() in order to get the correct Minecraft package
 				Class<?> craftEntity = getCraftEntityClass();
 				Method getHandle = craftEntity.getMethod("getHandle");
@@ -141,16 +157,16 @@ public class MinecraftReflection {
 					MINECRAFT_PREFIX_PACKAGE = MINECRAFT_FULL_PACKAGE;
 					
 					// The package is usualy flat, so go with that assumtion
-					DYNAMIC_PACKAGE_MATCHER = 
+					String matcher = 
 							(MINECRAFT_PREFIX_PACKAGE.length() > 0 ? 
 									Pattern.quote(MINECRAFT_PREFIX_PACKAGE + ".") : "") + "\\w+";
 					
 					// We'll still accept the default location, however
-					DYNAMIC_PACKAGE_MATCHER = "(" + DYNAMIC_PACKAGE_MATCHER + ")|(" + MINECRAFT_OBJECT + ")";
+					setDynamicPackageMatcher("(" + matcher + ")|(" + MINECRAFT_OBJECT + ")");
 					
 				} else {
 					// Use the standard matcher
-					DYNAMIC_PACKAGE_MATCHER = MINECRAFT_OBJECT;
+					setDynamicPackageMatcher(MINECRAFT_OBJECT);
 				}
 				
 				return MINECRAFT_FULL_PACKAGE;
@@ -159,13 +175,41 @@ public class MinecraftReflection {
 				throw new RuntimeException("Security violation. Cannot get handle method.", e);
 			} catch (NoSuchMethodException e) {
 				throw new IllegalStateException("Cannot find getHandle() method on server. Is this a modified CraftBukkit version?", e);
+			} finally {
+				initializing = false;
 			}
 			
 		} else {
+			initializing = false;
 			throw new IllegalStateException("Could not find Bukkit. Is it running?");
 		}
 	}
 	
+	/**
+	 * Update the dynamic package matcher.
+	 * @param regex - the Minecraft package regex.
+	 */
+	private static void setDynamicPackageMatcher(String regex) {
+		DYNAMIC_PACKAGE_MATCHER = regex;
+		
+		// Ensure that the matcher is regenerated
+		fuzzyMatcher = null;
+	}
+	
+	// Patch for Libigot
+	private static void handleLibigot() {
+		try {
+			getCraftEntityClass();
+		} catch (RuntimeException e) {
+			// Try reverting the package to the old format
+			craftbukkitPackage = null;
+			CRAFTBUKKIT_PACKAGE = "org.bukkit.craftbukkit";
+			
+			// This might fail too
+			getCraftEntityClass();
+		}
+	}
+
 	/**
 	 * Used during debugging and testing.
 	 * @param minecraftPackage - the current Minecraft package.
@@ -176,7 +220,7 @@ public class MinecraftReflection {
 		CRAFTBUKKIT_PACKAGE = craftBukkitPackage;
 		
 		// Standard matcher
-		DYNAMIC_PACKAGE_MATCHER = MINECRAFT_OBJECT;
+		setDynamicPackageMatcher(MINECRAFT_OBJECT);
 	}
 	
 	/**
@@ -244,8 +288,7 @@ public class MinecraftReflection {
 		if (clazz == null)
 			throw new IllegalArgumentException("Class cannot be NULL.");
 		
-		// Doesn't matter if we don't check for the version here
+		return getMinecraftObjectMatcher().isMatch(clazz, null);
-		return clazz.getName().startsWith(MINECRAFT_PREFIX_PACKAGE);
 	}
 	
 	/**
@@ -809,9 +852,15 @@ public class MinecraftReflection {
 								returnTypeMatches(tagCompoundContract).
 								build()					
 							 );
+			Class<?> nbtBase = selected.getReturnType().getSuperclass();
+			
+			// That can't be correct
+			if (nbtBase == null || nbtBase.equals(Object.class)) {
+				throw new IllegalStateException("Unable to find NBT base class: " + nbtBase);
+			}
 
 			// Use the return type here too
-			return setMinecraftClass("NBTBase", selected.getReturnType());
+			return setMinecraftClass("NBTBase", nbtBase);
 		}
  	}
 

ProtocolLib/src/main/java/com/comphenix/protocol/utility/MinecraftVersion.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.comphenix.protocol;
+package com.comphenix.protocol.utility;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -31,7 +31,7 @@ import com.google.common.collect.Ordering;
  * 
  * @author Kristian
  */
-class MinecraftVersion implements Comparable<MinecraftVersion> {
+public class MinecraftVersion implements Comparable<MinecraftVersion> {
 	/**
 	 * Regular expression used to parse version strings.
 	 */

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/TroveWrapper.java

@@ -0,0 +1,104 @@
+package com.comphenix.protocol.wrappers;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.annotation.Nonnull;
+
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.fuzzy.AbstractFuzzyMatcher;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyMatchers;
+
+/**
+ * Wrap a GNU Trove Collection class with an equivalent Java Collection class.
+ * @author Kristian
+ */
+public class TroveWrapper {
+	private volatile static Class<?> decorators;
+	
+	/**
+	 * Retrieve a Java wrapper for the corresponding Trove map.
+	 * @param troveMap - the trove map to wrap.
+	 * @return The wrapped GNU Trove map.
+	 * @throws IllegalStateException If GNU Trove cannot be found in the class map.
+	 * @throws IllegalArgumentException If troveMap is NULL.
+	 * @throws FieldAccessException Error in wrapper method or lack of reflection permissions.
+	 */
+	public static <TKey, TValue> Map<TKey, TValue> getDecoratedMap(@Nonnull Object troveMap) {
+		@SuppressWarnings("unchecked")
+		Map<TKey, TValue> result = (Map<TKey, TValue>) getDecorated(troveMap);
+		return result;
+	}
+	
+	/**
+	 * Retrieve a Java wrapper for the corresponding Trove set.
+	 * @param troveSet - the trove set to wrap.
+	 * @return The wrapped GNU Trove set.
+	 * @throws IllegalStateException If GNU Trove cannot be found in the class map.
+	 * @throws IllegalArgumentException If troveSet is NULL.
+	 * @throws FieldAccessException Error in wrapper method or lack of reflection permissions.
+	 */
+	public static <TValue> Set<TValue> getDecoratedSet(@Nonnull Object troveSet) {
+		@SuppressWarnings("unchecked")
+		Set<TValue> result = (Set<TValue>) getDecorated(troveSet);
+		return result;
+	}
+	
+	/**
+	 * Retrieve a Java wrapper for the corresponding Trove list.
+	 * @param troveList - the trove list to wrap.
+	 * @return The wrapped GNU Trove list.
+	 * @throws IllegalStateException If GNU Trove cannot be found in the class map.
+	 * @throws IllegalArgumentException If troveList is NULL.
+	 * @throws FieldAccessException Error in wrapper method or lack of reflection permissions.
+	 */
+	public static <TValue> List<TValue> getDecoratedList(@Nonnull Object troveList) {
+		@SuppressWarnings("unchecked")
+		List<TValue> result = (List<TValue>) getDecorated(troveList);
+		return result;
+	}
+	
+	private static Object getDecorated(@Nonnull Object trove) {
+		if (trove == null)
+			throw new IllegalArgumentException("trove instance cannot be non-null.");
+		
+		AbstractFuzzyMatcher<Class<?>> match = FuzzyMatchers.matchSuper(trove.getClass());
+		
+		if (decorators == null) {
+			try {
+				// Attempt to get decorator class
+				decorators = TroveWrapper.class.getClassLoader().loadClass("gnu.trove.TDecorators");
+			} catch (ClassNotFoundException e) {
+				throw new IllegalStateException("Cannot find TDecorators in Gnu Trove.", e);
+			}
+		}
+		
+		// Find an appropriate wrapper method in TDecorators
+		for (Method method : decorators.getMethods()) {
+			Class<?>[] types = method.getParameterTypes();
+			
+			if (types.length == 1 && match.isMatch(types[0], null)) {
+				try {
+					Object result = method.invoke(null, trove);
+					
+					if (result == null)
+						throw new FieldAccessException("Wrapper returned NULL.");
+					else
+						return result;
+					
+				} catch (IllegalArgumentException e) {
+					throw new FieldAccessException("Cannot invoke wrapper method.", e);
+				} catch (IllegalAccessException e) {
+					throw new FieldAccessException("Illegal access.", e);
+				} catch (InvocationTargetException e) {
+					throw new FieldAccessException("Error in invocation.", e);
+				}
+			}
+		}
+		
+		throw new IllegalArgumentException("Cannot find decorator for " + trove + " (" + trove.getClass() + ")");
+	}
+}

ProtocolLib/src/main/resources/config.yml

@@ -6,8 +6,6 @@ global:
     
     # Number of seconds to wait until a new update is downloaded
     delay: 43200 # 12 hours
-    # Last update time
-    last: 0
  
   metrics: true
   
@@ -19,3 +17,9 @@ global:
   
   # Override the starting injecting method
   injection method: 
+  
+  # Whether or not to enable the filter command
+  debug: false
+  
+  # The engine used by the filter command
+  script engine: JavaScript

ProtocolLib/src/main/resources/plugin.yml

@@ -1,9 +1,11 @@
 name: ProtocolLib
-version: 2.3.0
+version: 2.4.3
 description: Provides read/write access to the Minecraft protocol.
 author: Comphenix
 website: http://www.comphenix.net/ProtocolLib
+
 main: com.comphenix.protocol.ProtocolLibrary
+load: startup
 database: false
 
 commands:
@@ -17,6 +19,12 @@ commands:
     usage: /<command> add|remove|names client|server [ID start]-[ID stop] [detailed]
     permission: protocol.admin
     permission-message: You don't have <permission>
+  filter:
+    description: Add or remove programmable filters to the packet listeners.
+    usage: /<command> add|remove name [ID start]-[ID stop]
+    aliases: [packet_filter]
+    permission: protocol.admin
+    permission-message: You don't have <permission>
 
 permissions:
   protocol.*:

ProtocolLib/src/test/java/com/comphenix/protocol/BukkitInitialization.java

@@ -4,8 +4,10 @@ import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
+import net.minecraft.server.v1_5_R2.StatisticList;
+
 // Will have to be updated for every version though
-import org.bukkit.craftbukkit.v1_4_R1.inventory.CraftItemFactory;
+import org.bukkit.craftbukkit.v1_5_R2.inventory.CraftItemFactory;
 
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
@@ -34,6 +36,12 @@ public class BukkitInitialization {
 						
 			initializePackage();
 			
+			try {
+				StatisticList.b();
+			} catch (Exception e) {
+				// Swallow
+			}
+			
 			// Mock the server object
 			Server mockedServer = mock(Server.class);
 			ItemFactory mockedFactory = mock(CraftItemFactory.class);
@@ -55,6 +63,6 @@ public class BukkitInitialization {
 	 */
 	public static void initializePackage() {
 		// Initialize reflection
-		MinecraftReflection.setMinecraftPackage("net.minecraft.server.v1_4_R1", "org.bukkit.craftbukkit.v1_4_R1");
+		MinecraftReflection.setMinecraftPackage("net.minecraft.server.v1_5_R2", "org.bukkit.craftbukkit.v1_5_R2");
 	}
 }

ProtocolLib/src/test/java/com/comphenix/protocol/MinecraftVersionTest.java

@@ -21,6 +21,8 @@ import static org.junit.Assert.*;
 
 import org.junit.Test;
 
+import com.comphenix.protocol.utility.MinecraftVersion;
+
 public class MinecraftVersionTest {
 
 	@Test

ProtocolLib/src/test/java/com/comphenix/protocol/events/PacketContainerTest.java

@@ -22,7 +22,7 @@ import java.lang.reflect.Array;
 import java.util.List;
 
 // Will have to be updated for every version though
-import org.bukkit.craftbukkit.v1_4_R1.inventory.CraftItemFactory;
+import org.bukkit.craftbukkit.v1_5_R2.inventory.CraftItemFactory;
 
 import org.bukkit.Material;
 import org.bukkit.WorldType;