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From "Joe Roberts (JIRA)" <>
Subject [jira] [Created] (AMQ-3948) Multiple consumers retrieving same message from ActiveMQ
Date Thu, 26 Jul 2012 21:24:35 GMT
Joe Roberts created AMQ-3948:

             Summary: Multiple consumers retrieving same message from ActiveMQ
                 Key: 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

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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