Using MessageConsumers with Message Selector make messages stuck in queue

Hi *,
here's the situation:

We have JBossAS 4.2.2 with no changes. We're using the example queue 'A' (test with a new queue was not successfull) and transacted sessions.
Every MessageConsumer and MessageProducer share the same Connection-object (changing this didn't help) and have their own Session-object.

We use MessageConsumers with a MessageSelector and have to change the selector after a while. So that means closing the old consumer and create an new consumer with a new selector.

First we sent 10.000 messages through a MessageProducer and after the messages have arrived we started two consumers (and changed the selector again and again). Everything works fine: The programm ends, all messages sent are recieved.

But then the MessageProducer runs parallel as a seperate thread.
What happens?
The programm doesn't quite (because not all messages are recieved) and the jmx-console shows that a few messages are stuck in the "InProcess"-list. When you now close the programm the messages return to the queue.

We tried that with not using selectors and everything worked fine. But we need to use selectors.

I attached the test-programm.