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https://issues.apache.org/activemq/browse/AMQ-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-2966.
-----------------------------

    Resolution: Fixed

resolved in r1005773

> Null messages occurring when using VM transport, topics and multiple consumers
> ------------------------------------------------------------------------------
>
>                 Key: AMQ-2966
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2966
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.4.0, 5.4.1
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.5.0
>
>
> introduced by fix for https://issues.apache.org/activemq/browse/AMQ-2103
> contention on marshaling message received over vm transport for the first 
> time causes potential null. With multiple topic consumers there is contention 
> as the message has not been unmarshalled on dispatch to the topic due to the 
> vm transport being used.
> moving the set to null out of the beforeMarahallMessage removes the potential 
> sync window that causes the problem. 

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