I've noticed some strange behaviour in JBM 2.0.0.BETA3. We have a client 
application which queues up messages and sends them periodically to a topic. 
Sometimes the client gets into a strange state where:

message = session.createTextMessage();

returns null. I've never seen this happen before. The strange thing is that it 
doesn't happen on every call to createTextMessage. It will work for a few 
calls, then return null, then work again for a few more etc. It also doesn't 
happen all the time, our other client application running the same code at the 
same time does not exhibit this behaviour. In what cases would this method 
return null? The spec says nothing about this other than that a JMSException 
should be throw if an error occurs creating the message.

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