Invalid Callback Exception ICE and Java

[Tiim]

Hello everybody

I want to write a bot that notifies me when someone joins my mumble server.

For that I would like to use the ICE callbacks instead of querying the server every minute, but

I can't get these callbacks to work. I tried porting the python code from testcallback.py to java. But unfortunately

the addCallback method on the Server object throws an Murmur.InvalidCallbackException.

[HERE] is my code. You can run the ICE module alone by specifying ch.tiim.murmur.IceController as main class.

I would really appreciate any help.

-Tiim

EDIT: Changed the link so it wouldn't break on my next commit