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https://issues.apache.org/activemq/browse/AMQ-2089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=49003#action_49003
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Gary Tully commented on AMQ-2089:
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looking at the code, I think part of the problem is the use of a static
session, this will be shared across all threads and overwritten by each
createConnection()
make the session and connection class instance variables and it will behave
better. This would explain why you only see it when there are more than one
consumer threads.
> Transacted Messages Not Committed
> ---------------------------------
>
> Key: AMQ-2089
> URL: https://issues.apache.org/activemq/browse/AMQ-2089
> Project: ActiveMQ
> Issue Type: Test
> Components: Broker
> Affects Versions: 5.2.0
> Environment: linux centOS 64 bit, JRE 1.6.0_11-b03
> Reporter: Frank E. Banks
> Attachments: AMQWorkerTest.java, TestCase.java
>
>
> The basic architecture of the consumer is a java daemon that spawns a
> configurable number of single threaded consumers that implement
> MessageListener- each opens its own connection and transacted session. In
> the consumer onMessage() method session.commit() is being called upon
> successful processing of the message- and I've verified that it is actually
> executed. The problem is that despite the message being successfully
> processed and session.commit() executed the messages remain as pending in the
> queue. If the consumer daemon is stopped and re-started these messages are
> consumed again (definitely not good). Note that session.rollback() was NOT
> called in this scenario, all the messages were processed successfully. Also
> note that these are persistent messages and we are using the default AMQ
> message store.
> - The problem *only* occurs when the number of consumer threads is greater
> than 1.
> - The problem occurs whether or not a correlation ID is used on the messages.
> I wasn't sure if this mattered or not, but it doesn't.
> Fortunately, as a result of working with this test case I discovered a work
> around to the problem, which is to not only call session.commit() on
> successful message processing but to then call message.acknowledge() as well.
> This works like a charm, but it was my understanding that calling
> message.acknowledge() was not necessary when using transacted sessions.
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