[Kryonet] Exception when casting received Object (Bug?)

Networking & Multiplayer
#1

I have this small piece of code in my class which extends Listener:

@Override
public void received(Connection connection, Object object)
{
    Packet packet = (Packet) object;
    server.addPacket(new ClientPacket(connection.getID(), packet));
}

Whenever I receive an Object, I cast it to an Interface called Packet with a method handle() which every packet implement. I then add it to a ConcurrentLinkedQueue for future processing.

Still, after i spam a few keys which send UDP packets to the server, the following Exception is thrown:


Exception in thread "Server" java.lang.ClassCastException: com.esotericsoftware.kryonet.FrameworkMessage$KeepAlive cannot be cast to com.xkynar.game.net.packet.Packet
at com.xkynar.game.net.ServerSocket.received(ServerSocket.java:70)
at com.esotericsoftware.kryonet.Server$1.received(Server.java:61) at com.esotericsoftware.kryonet.Connection.notifyReceived(Connection.java:246)
at com.esotericsoftware.kryonet.Server.update(Server.java:208)
at com.esotericsoftware.kryonet.Server.run(Server.java:356) at java.lang.Thread.run(Unknown Source)

The exception occurs in the cast, that is:

Packet packet = (Packet) object;

How can this be possible? What the hell is “FrameworkMessage$KeepAlive” to begin with? Why is it entering my received listener?
Is it my mistake or a bug?
Thank you.