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https://issues.apache.org/activemq/browse/AMQ-1556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=41689#action_41689
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Matthew Roy commented on AMQ-1556:
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I still see frequent concurrency issues within this class's dispose method when
it clears the linked list.
java.lang.NullPointerException
at java.util.LinkedList.clear(LinkedList.java:294)
at
org.apache.activemq.ActiveMQMessageConsumer.dispose(ActiveMQMessageConsumer.java:661)
at
org.apache.activemq.ActiveMQMessageConsumer.close(ActiveMQMessageConsumer.java:578)
...
> Concurrency Issue on MessageConsumer deliveredMessages
> ------------------------------------------------------
>
> Key: AMQ-1556
> URL: https://issues.apache.org/activemq/browse/AMQ-1556
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.0.0
> Reporter: Rob Davies
> Assignee: Rob Davies
> Fix For: 5.1.0
>
>
> The LinkedList can be modified concurrently - see
> http://www.nabble.com/NPE-while-consuming-messages-to12301153s2354.html
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