Memory monitor exception

I am working on a mobile game using JSR-184 and WTK 2.2.0. When I try to run the program with the memory monitor enabled (on emulator) I always end up with the following exception:
Exception in thread "Thread-5" java.lang.RuntimeException: Inconsistent classes map
    at com.sun.kvem.memorymon.ObjectNode.free(Unknown Source)
    at com.sun.kvem.memorymon.ObjectsMonitor.freeObject(Unknown Source)
    at com.sun.kvem.memorymon.MemoryMonitor.freeObject(Unknown Source)
    at com.sun.kvem.memorymon.MemoryListener.run(Unknown Source)What can cause this? It appears to be thrown before the MIDlet constructor is called.
I'm using NetBeans 4.0 as the IDE, if that matters.
Thanks for your help,
Patrik

Which error do you get? java.lang.OutOfMemoryError: PermGen space? Or do you get your error from a different memory?
In case of PermGen: In my opinion threre is a bug (not yet accepted by sun/oracle) described here:
[ OOME because of MBeanServerConnection addListener |http://forums.sun.com/thread.jspa?threadID=5407170&messageID=10814433#10814433]
If you are doing something similar, this could be the cause. Our workaround is to disconnect periodically.

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