public void removeHandler( short objId, RpcHandler handler ) {
        RpcHandler removing = handlers.get(objId);
        if( handler != removing ) {
            throw new IllegalArgumentException("Handler not registered for object ID:" 
                                                + objId + ", handler:" + handler );
        }
        handlers.remove(objId);
    }
Removes a previously registered handler for the specified
 object ID.
jme3-networking/src/main/java/com/jme3/network/service/rpc/RpcConnection.java