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From ErnestPasour <>
Subject trouble receiving messages from some queues
Date Wed, 12 Sep 2007 17:35:56 GMT

I have a distributed program that uses 2 message queues for communication. 
Process A writes a message to Q1.  Process B reads the message from Q1 and
later posts a message to Q2.  Process A reads the message from Q2.

I am using ActiveMQ 4.1.1 as my persistent broker.

If Process A and Process B are on the same machine (whether or not the
broker is on that same machine), then things work fine.  However, if A and B
are on different machines, the last step fails (i.e. Process A cannot
receive the message from Q2).

I have jconsole up and can see that there is a message in Q2.  However,
Process A cannot seem to see it.  Restarting Process A doesn't help.  I am
making a straight q2.receive() call.  

Does anyone have an idea what the problem might be or how I can get more
debugging information?  

Is it possible to put a "bad" message on Q2 that cannot be read?  

I am not using a message selector with my receive() call.  

I have experimented and found that Process A can write a message to Q2 and
then the same receive() call will grab that message.  But the message it
couldn't read (from before) is left out on Q2.

Thanks for any ideas,
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