callbackClient.setSubsystem(JMSRemotingConnection.JMS_CALLBACK_SUBSYSTEM);
callbackClient.setSubsystem(CallbackServerFactory.JMS_CALLBACK_SUBSYSTEM);
   public void setCallbackClient(Client client)   {      callbackClient = client;      // TODO not sure if this is the best way to do this, but the callbackClient needs to have      //      its "subsystem" set, otherwise remoting cannot find the associated      //      ServerInvocationHandler on the callback server      callbackClient.setSubsystem(JMSRemotingConnection.JMS_CALLBACK_SUBSYSTEM);      // We explictly set the Marshaller since otherwise remoting tries to resolve the marshaller      // every time which is very slow - see org.jboss.remoting.transport.socket.ProcessInvocation      // This can make a massive difference on performance. We also do this in      // JMSRemotingConnection.setupConnection      callbackClient.setMarshaller(new JMSWireFormat());      callbackClient.setUnMarshaller(new JMSWireFormat());   }