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From Torsten Mielke <>
Subject Re: Problems understanding redelivery
Date Wed, 31 Aug 2011 14:50:19 GMT

1) Its the call to javax.jms.Connection.createSession(boolean transacted, int acknowledgeMode)
where you can specify whether your Session is transacted or not.
So its basically a flag.

2) The acknowledge mode is passed in the above call as well. Note, the acknowledgeMode is
ignored if the session is transacted

3) Not necessarily, only when there are messages produced for the dead letter queue. ActiveMQ
creates destinations on the fly.
Out of the box you will not see a dead letter queue.

Hope that helps.

Torsten Mielke

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