Improved documentation in a few places.

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

@@ -81,6 +81,8 @@ public class ProtocolLibrary extends JavaPlugin {
 	
 	/**
 	 * Retrieve the metrics instance used to measure users of this library.
+	 * <p>
+	 * Note that this method may return NULL when the server is reloading or shutting down.
 	 * @return Metrics instance container.
 	 */
 	public Statistics getStatistics() {

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

@@ -40,13 +40,19 @@ public interface ProtocolManager {
 	public ImmutableSet<PacketListener> getPacketListeners();
 
 	/**
-	 * Adds a packet listener.
+	 * Adds a packet listener. 
+	 * <p>
+	 * Adding an already registered listener has no effect. If you need to change the packets 
+	 * the current listener is observing, you must first remove the packet listener before you 
+	 * can register it again.
 	 * @param listener - new packet listener.
 	 */
 	public void addPacketListener(PacketListener listener);
 
 	/**
-	 * Removes a given packet listener.
+	 * Removes a given packet listener. 
+	 * <p>
+	 * Attempting to remove a listener that doesn't exist has no effect.
 	 * @param listener - the packet listener to remove.
 	 */
 	public void removePacketListener(PacketListener listener);
@@ -107,16 +113,16 @@ public interface ProtocolManager {
 	/**
 	 * Constructs a new encapsulated Minecraft packet with the given ID.
 	 * <p>
-	 * If set to true, the skip default option will prevent the system from assigning 
+	 * If set to true, the <i>forceDefaults</i> option will force the system to automatically 
-	 * non-primitive fields in the packet to a new default instance. For instance, certain
+	 * give non-primitive fields in the packet sensible default values. For instance, certain
 	 * packets - like Packet60Explosion - require a List or Set to be non-null. If the
-	 * skipDefaults option is false, the List or Set will be automatically created.
+	 * forceDefaults option is true, the List or Set will be automatically created.
 	 * 
 	 * @param id - packet ID.
-	 * @param skipDefaults - TRUE to skip setting default values, FALSE otherwise.
+	 * @param forceDefaults - TRUE to use sensible defaults in most fields, FALSE otherwise.
 	 * @return New encapsulated Minecraft packet.
 	 */
-	public PacketContainer createPacket(int id, boolean skipDefaults);
+	public PacketContainer createPacket(int id, boolean forceDefaults);
 
 	/**
 	 * Retrieves a immutable set containing the ID of the sent server packets that will be observed by listeners.

ProtocolLib/src/com/comphenix/protocol/events/PacketAdapter.java

@@ -19,7 +19,6 @@ package com.comphenix.protocol.events;
 
 import org.bukkit.plugin.Plugin;
 
-
 /**
  * Represents a packet listener with useful constructors.
  * 
@@ -33,7 +32,7 @@ public abstract class PacketAdapter implements PacketListener {
 	protected ListeningWhitelist sendingWhitelist = ListeningWhitelist.EMPTY_WHITELIST;
 
 	/**
-	 * Initialize a packet listener.
+	 * Initialize a packet listener with default priority.
 	 * @param plugin - the plugin that spawned this listener.
 	 * @param connectionSide - the packet type the listener is looking for.
 	 * @param packets - the packet IDs the listener is looking for.
@@ -43,7 +42,7 @@ public abstract class PacketAdapter implements PacketListener {
 	}
 	
 	/**
-	 * Initialize a packet listener.
+	 * Initialize a packet listener for a single connection side.
 	 * @param plugin - the plugin that spawned this listener.
 	 * @param connectionSide - the packet type the listener is looking for.
 	 * @param listenerPriority - the event priority.

ProtocolLib/src/com/comphenix/protocol/events/PacketListener.java

@@ -21,6 +21,8 @@ import org.bukkit.plugin.Plugin;
 
 /**
  * Represents a listener that recieves notifications when packets are sent or recieved.
+ * <p>
+ * Use {@link PacketAdapter} for a simple wrapper around this interface.
  * @author Kristian
  */
 public interface PacketListener {

ProtocolLib/src/com/comphenix/protocol/injector/ConcurrentListenerMultimap.java

@@ -29,6 +29,7 @@ public class ConcurrentListenerMultimap {
 	/**
 	 * Adds a listener to its requested list of packet recievers.
 	 * @param listener - listener with a list of packets to recieve notifcations for.
+	 * @param whitelist - the packet whitelist to use.
 	 */
 	public void addListener(PacketListener listener, ListeningWhitelist whitelist) {
 		
@@ -66,6 +67,7 @@ public class ConcurrentListenerMultimap {
 	/**
 	 * Removes the given listener from the packet event list.
 	 * @param listener - listener to remove.
+	 * @param whitelist - the packet whitelist that was used.
 	 * @return Every packet ID that was removed due to no listeners.
 	 */
 	public List<Integer> removeListener(PacketListener listener, ListeningWhitelist whitelist) {
@@ -113,7 +115,7 @@ public class ConcurrentListenerMultimap {
 			for (PrioritizedListener element : list) {
 				try {
 					element.getListener().onPacketReceiving(event);
-				} catch (Exception e) {
+				} catch (Throwable e) {
 					// Minecraft doesn't want your Exception.
 					logger.log(Level.SEVERE, 
 							"Exception occured in onPacketReceiving() for " + 
@@ -138,7 +140,7 @@ public class ConcurrentListenerMultimap {
 			for (PrioritizedListener element : list) {
 				try {
 					element.getListener().onPacketSending(event);
-				} catch (Exception e) {
+				} catch (Throwable e) {
 					// Minecraft doesn't want your Exception.
 					logger.log(Level.SEVERE, 
 							"Exception occured in onPacketReceiving() for " + 

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

@@ -40,6 +40,7 @@ import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.server.PluginDisableEvent;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginManager;
 
@@ -270,15 +271,15 @@ public final class PacketFilterManager implements ProtocolManager {
 	
 	@Override
 	public PacketContainer createPacket(int id) {
-		return createPacket(id, false);
+		return createPacket(id, true);
 	}
 	
 	@Override
-	public PacketContainer createPacket(int id, boolean skipDefaults) {
+	public PacketContainer createPacket(int id, boolean forceDefaults) {
 		PacketContainer packet = new PacketContainer(id);
 		
 		// Use any default values if possible
-		if (!skipDefaults) {
+		if (forceDefaults) {
 			try {
 				packet.getModifier().writeDefaults();
 			} catch (FieldAccessException e) {
@@ -331,7 +332,7 @@ public final class PacketFilterManager implements ProtocolManager {
 	 * @param manager - Bukkit plugin manager that provides player join/leave events.
 	 * @param plugin - the parent plugin.
 	 */
-	public void registerEvents(PluginManager manager, Plugin plugin) {
+	public void registerEvents(PluginManager manager, final Plugin plugin) {
 		
 		try {
 			manager.registerEvents(new Listener() {
@@ -345,6 +346,15 @@ public final class PacketFilterManager implements ProtocolManager {
 			    public void onPlayerQuit(PlayerQuitEvent event) {
 					uninjectPlayer(event.getPlayer());
 			    }
+				
+				@EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
+			    public void onPluginDisabled(PluginDisableEvent event) {
+					// Clean up in case the plugin forgets
+					if (event.getPlugin() != plugin) {
+						removePacketListeners(event.getPlugin());
+					}
+			    }
+				
 			}, plugin);
 		
 		} catch (NoSuchMethodError e) {
@@ -370,6 +380,7 @@ public final class PacketFilterManager implements ProtocolManager {
 			// Get event types
 			Object playerJoinType = Enum.valueOf(eventTypes, "PLAYER_JOIN");
 			Object playerQuitType = Enum.valueOf(eventTypes, "PLAYER_QUIT");
+			Object pluginDisabledType = Enum.valueOf(eventTypes, "PLUGIN_DISABLE");
 			
 			// The player listener! Good times.
 			Class<?> playerListener = loader.loadClass("org.bukkit.event.player.PlayerListener");
@@ -394,6 +405,8 @@ public final class PacketFilterManager implements ProtocolManager {
 							injectPlayer(((PlayerJoinEvent) event).getPlayer());
 						else if (event instanceof PlayerQuitEvent)
 							injectPlayer(((PlayerQuitEvent) event).getPlayer());
+						else if (event instanceof PluginDisableEvent)
+							removePacketListeners(((PluginDisableEvent) event).getPlugin());
 					}
 					
 					return null;
@@ -405,6 +418,7 @@ public final class PacketFilterManager implements ProtocolManager {
 			
 			registerEvent.invoke(manager, playerJoinType, proxy, priorityNormal, plugin);
 			registerEvent.invoke(manager, playerQuitType, proxy, priorityNormal, plugin);
+			registerEvent.invoke(manager, pluginDisabledType, proxy, priorityNormal, plugin);
 			
 			// A lot can go wrong
 		} catch (ClassNotFoundException e1) {