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JMS Queue Issue

 
Greenhorn
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Hi all, glad to be back after a couple years away from the Java-land (no pun intended).

I'm in the process of learning JBoss' JMS using its default queues (queue/a and queue/b). I found this piece of code from JBoss AS document (I think it's the old version.. v.4.0), and I execute it using JBoss 4.2.1.GA.

I modified the code so that it'll have a Consumer and a Producer classes consuming text-messages from queue/b and queue/a respectively. I found a problem in which the text message I sent to both queues were NOT cleared when it is consumed/retrived.

I'm pretty sure it's not my JBoss setting cause I don't receive any error/warning messages when I start it. Then again, I'm not sure why the text-messages are not cleared despite of the fact I have put the expiration time to it and restart my machine.

Any suggestion will be much appreciated. Thank you in advance for you enlightment on this issue.

The following is the snippet of my Producer class:
 
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