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https://issues.apache.org/activemq/browse/AMQ-1126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47638#action_47638
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Sharath Komarla commented on AMQ-1126:
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After further research, I no longer believe this to be RA specific. A
colleague of mine has filed issue 2016, and I believe that to be the root cause
of what I was seeing.
> The Resource Adapter ignores the JMSXGroupID when dispatching to MDBs
> ---------------------------------------------------------------------
>
> Key: AMQ-1126
> URL: https://issues.apache.org/activemq/browse/AMQ-1126
> Project: ActiveMQ
> Issue Type: Bug
> Components: JCA Container
> Affects Versions: 4.0.1
> Environment: Java 1.4.2_08
> JBoss 4.0.4
> ActiveMQ 4.0.1
> Reporter: John Robinson
> Fix For: 5.3.0
>
> Attachments: msg-group-test.zip
>
>
> Integrate AMQ into JBoss using the data source, and resource adapter. Create
> an outbound queue and an MDB with a pool size of 100. Dispatch several
> messages to the outbound queue, setting the JMSXGroupID property on the
> message to be the same value each time. In the MDB's onMessage method print
> out the MDBs toString (don't override toString) and you should see something
> that looks like:
> [EMAIL PROTECTED]
> Observe two things:
> a) Many messages are processed in parallel
> b) Many different values will occur after the @ in the above message,
> denoting that more than on MDB instance is being handed messages.
> The correct behavior would be to dispatch messages with the same group id to
> the same MDB instance in sequence. This would allow messages from different
> groups to be processed in parallel, but messages in any one group would be
> processed serially, in the order in which they were placed into the queue.
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