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https://issues.apache.org/jira/browse/AMQ-4207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510810#comment-13510810
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Vadim Pesochinskiy commented on AMQ-4207:
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I cannot think of a way to reproduce it in unit test. It happens rarely.
> NullPointerException in ActiveMQSession.rollback()
> --------------------------------------------------
>
> Key: AMQ-4207
> URL: https://issues.apache.org/jira/browse/AMQ-4207
> Project: ActiveMQ
> Issue Type: Bug
> Components: JMS client
> Affects Versions: 5.5.1, 5.6.0, 5.7.0
> Reporter: Vadim Pesochinskiy
> Priority: Minor
> Fix For: 5.8.0
>
>
> Sometimes we get this exception:
> java.lang.NullPointerException
> at org.apache.activemq.ActiveMQSession.rollback(ActiveMQSession.java:581)
> at
> com.barra.cp.common.activemq.MultiQueueReceiver.rollback(MultiQueueReceiver.java:212)
> at
> com.barra.cp.common.activemq.MultiQueueReceiver.onMessage(MultiQueueReceiver.java:185)
> The synchronized dispose() method nulls the transactionContext and sets
> closed to true. In many places in the code, not synchronized code checks
> closed member variable and later references transactionContext, which can
> become null by that time.
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