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https://issues.apache.org/jira/browse/AMQ-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423860#comment-13423860
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Timothy Bish commented on AMQ-3948:
-----------------------------------
Messages can be redelivered if your client fails to ACK them. Can you provide
a unit test that shows your issue? Since you are on an old release its a good
idea to give the latest release a try as well to see if your issue has been
addressed.
> Multiple consumers retrieving same message from ActiveMQ
> --------------------------------------------------------
>
> Key: AMQ-3948
> URL: https://issues.apache.org/jira/browse/AMQ-3948
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.4.3
> Environment: ActiveMQ 5.4.3 running on 64-bit Windows 7 OS. 64-bit
> JDK.
> Reporter: Joe Roberts
> Fix For: NEEDS_REVIEWED
>
> Attachments: applicationContext-mcp-parallelization-activemq.xml
>
>
> We have a java web-service (running in Jetty) that dynamically instantiates
> an ActiveMQ queue and send messages to the queue - the messages are integers
> (i.e. 1, 2, 3, etc). We have from one to many consumers that read from this
> queue to process these messages. Each consumer is started from a single
> process but each consumer is running in it's own thread or process. When we
> have multiple consumers running, they occasionally will pick up the same
> integer or message from the queue. This is not desired. If a consumer reads a
> message, we don't want other consumers to retrieve that same message. We're
> fairly new to ActiveMQ but those we're telling about this issue said it
> should not be happening. They think it might be that we have an ActiveMQ
> configuration issue. Could be we need to set a property to prevent this. Just
> looking for some help. I've attached our
> applicationContext-mcp-parallelization-activemq XML. We could have configured
> this incorrectly. We're using the internalAmqConnectionFactory for this queue.
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