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https://issues.apache.org/jira/browse/AMQ-6642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher L. Shannon resolved AMQ-6642.
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Resolution: Fixed
> MessageStore update message can encounter NPE with KahaDB
> ---------------------------------------------------------
>
> Key: AMQ-6642
> URL: https://issues.apache.org/jira/browse/AMQ-6642
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.14.4
> Reporter: Christopher L. Shannon
> Assignee: Christopher L. Shannon
> Labels: kahaDB
> Fix For: 5.15.0, 5.14.5
>
>
> If KahaDB subscription statistics have been enabled (off by default) then
> it's possible to get a null pointer exception if updateMessage() is called on
> the message store. This occurs if the destination is a Queue as there is not
> a proper null pointer check done for ackPositions which only exists when
> using a Topic.
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