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https://issues.apache.org/jira/browse/QPID-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15968767#comment-15968767
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Lorenz Quack commented on QPID-7744:
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I don't know of a situation other than testing where this would occur.
This came about when I was looking for a way to inject messages directly into
the broker in a test.
The easiest way seemed to be to create a {{ManageableMessage}} and use
{{QueueManagingVirtualHost#publishMessage}} to inject it.
Another approach would have been to use {{Subject.doAs}} in the tests but I saw
that the other places in the code cope just fine with a null user so I thought
I simply make this part consistent with the others (and my testing code simpler
in the process).
> [Java Broker] Fix NPE in AbstractVirtualHost$MessageHeaderImpl when there is
> no user principal
> ----------------------------------------------------------------------------------------------
>
> Key: QPID-7744
> URL: https://issues.apache.org/jira/browse/QPID-7744
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Reporter: Lorenz Quack
> Fix For: qpid-java-broker-7.0.0
>
>
> Currently, the broker produces a NullPointerException when
> {{MessageHeaderImpl}} are instantiated while the subject does not have a
> UserPrincipal.
> While this scenario should not occur outside of testing it is better to guard
> against NPEs.
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