Fix the server packet cancelling feature.

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

@@ -418,6 +418,14 @@ public final class PacketFilterManager implements ProtocolManager {
 			throw new IllegalArgumentException("Player has no injected handler.");
 	}
 	
+	/**
+	 * Retrieves the current plugin class loader.
+	 * @return Class loader.
+	 */
+	public ClassLoader getClassLoader() {
+		return classLoader;
+	}
+	
 	@Override
 	public boolean isClosed() {
 		return hasClosed;

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

@@ -218,19 +218,21 @@ class PlayerInjector {
 					@Override
 					public boolean add(Packet packet) {
 
+						Packet result = null;
+						
 						// Check for fake packets and ignored packets
 						if (packet instanceof FakePacket) {
 							return true;
 						} else if (ignoredPackets.contains(packet)) {
 							ignoredPackets.remove(packet);
 						} else {
-							packet = handlePacketRecieved(packet);
+							result = handlePacketRecieved(packet);
 						}
 						
 						// A NULL packet indicate cancelling
 						try {
-							if (packet != null) {
+							if (result != null) {
-								super.add(packet);
+								super.add(result);
 							} else {
 								// We'll use the FakePacket marker instead of preventing the filters
 								sendServerPacket(createNegativePacket(packet), true);
@@ -280,7 +282,7 @@ class PlayerInjector {
 		//   }
 		ex.setInterfaces(new Class[] { FakePacket.class } );
 		ex.setUseCache(true);
-		ex.setClassLoader(type.getClassLoader());
+		ex.setClassLoader(manager.getClassLoader());
 		ex.setSuperclass(type);
 		ex.setCallback(new MethodInterceptor() {
 			@Override