Use correct Guava package, fix a few compatibility issues

Modules/ProtocolLib-ShadedNetty/src/main/java/com/comphenix/protocol/compat/guava/Guava10.java

@@ -22,13 +22,12 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.Set;
 
-import net.minecraft.util.com.google.common.io.ByteStreams;
-import net.minecraft.util.com.google.common.io.InputSupplier;
-
 import com.comphenix.protocol.PacketType;
 import com.google.common.collect.DiscreteDomains;
 import com.google.common.collect.Range;
 import com.google.common.collect.Ranges;
+import com.google.common.io.ByteStreams;
+import com.google.common.io.InputSupplier;
 
 /**
  * @author dmulloy2

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

@@ -261,6 +261,8 @@ public class ProtocolLibrary extends JavaPlugin {
 				throw e;
 			} catch (ThreadDeath e) {
 				throw e;
+			} catch (LinkageError e) {
+				logger.warning("Failed to register command " + command.name() + ": " + e);
 			} catch (Throwable e) {
 				reporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_REGISTER_COMMAND)
 						.messageParam(command.name(), e.getMessage()).error(e));

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

@@ -122,13 +122,21 @@ public class DetailedErrorReporter implements ErrorReporter {
 			throw new IllegalArgumentException("Plugin cannot be NULL.");
 		
 		this.pluginReference = new WeakReference<Plugin>(plugin);
-		this.pluginName = plugin.getName();
+		this.pluginName = getNameSafely(plugin);
 		this.prefix = prefix;
 		this.supportURL = supportURL;
 		this.maxErrorCount = maxErrorCount;
 		this.logger = logger;
 	}
 
+	private String getNameSafely(Plugin plugin) {
+		try {
+			return plugin.getName();
+		} catch (LinkageError e) {
+			return "ProtocolLib";
+		}
+	}
+
 	// Attempt to get the logger.
 	private static Logger getBukkitLogger() {
 		try {

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

@@ -1166,4 +1166,9 @@ public class PacketContainer implements Serializable {
 			return WrappedChatComponent[].class;
 		}
 	}
+
+	@Override
+	public String toString() {
+		return "PacketContainer[type=" + type + ", structureModifier=" + structureModifier + "]";
+	}
 }

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

@@ -261,6 +261,7 @@ public class PacketEvent extends EventObject implements Cancellable {
 	 * Retrieves whether or not the packet should be cancelled.
 	 * @return TRUE if it should be cancelled, FALSE otherwise.
 	 */
+	@Override
 	public boolean isCancelled() {
 		return cancel;
 	}
@@ -307,6 +308,7 @@ public class PacketEvent extends EventObject implements Cancellable {
 	 * 
 	 * @param cancel - TRUE if it should be cancelled, FALSE otherwise.
 	 */
+	@Override
 	public void setCancelled(boolean cancel) {
 		if (readOnly)
 			throw new IllegalStateException("The packet event is read-only.");
@@ -445,4 +447,9 @@ public class PacketEvent extends EventObject implements Cancellable {
 	    	playerReference = new WeakReference<Player>(offlinePlayer);
 	    }
 	}
+
+	@Override
+	public String toString() {
+		return "PacketEvent[player=" + getPlayer() + ", packet=" + packet + "]";
+	}
 }

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

@@ -4,10 +4,12 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.logging.Level;
 
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginLoadOrder;
 
+import com.comphenix.protocol.ProtocolLibrary;
 import com.google.common.collect.Sets;
 
 /**
@@ -73,9 +75,15 @@ class PluginVerifier {
 	public PluginVerifier(Plugin dependency) {
 		if (dependency == null)
 			throw new IllegalArgumentException("dependency cannot be NULL.");
+
+		try {
 			// 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.");
+		} catch (LinkageError e) {
+			// They're probably using an ancient version of Bukkit
+			ProtocolLibrary.log(Level.WARNING, "Failed to determine loadBefore: " + e);
+		}
 
 		this.dependency = dependency;
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/StructureModifier.java

@@ -656,4 +656,9 @@ public class StructureModifier<TField> {
 		}
 		return result;
 	}
+
+	@Override
+	public String toString() {
+		return "StructureModifier[fieldType=" + fieldType + ", data=" + data + "]";
+	}
 }