Java-Midi not working on Mac?

Hi,

My extension needs to access the MidiSystem of Java.
But when it tries to access javax.sound.midi.MidiSystem my
Code stops executing without showing an exception

  Debug.showMessage("1");
  MidiSystem.getMidiDeviceInfo();
  Debug.showMessage("2");

No exception is caught. But Debug output only shows 1
Maybe this is related to the fact that I have to do the workaround
To get Java working on Mac 
http://wiki.services.openoffice.org/wiki/Documentation/FAQ/Platform/Mac_OS_X
_10.6

(Btw it works fine on Windows)

Any help for a workaround appreciated

Thanks,
  Martin