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https://issues.apache.org/jira/browse/QPID-1240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665276#action_12665276
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Robert Gemmell commented on QPID-1240:
--------------------------------------

I believe this would be the result of the same issue causing problems with 
delete user etc previously, an NPE when looking up the JMX username, and thus 
was fixed by QPID-1469. 

The reason it would appear successful is that the data is cached and would get 
modified before the error occured, but the NPE would have stopped the file 
being written so the change wouldnt have been persistent.

> NullPointerException when setting access level in UserManagement Panel
> ----------------------------------------------------------------------
>
>                 Key: QPID-1240
>                 URL: https://issues.apache.org/jira/browse/QPID-1240
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Management : JMX Console
>    Affects Versions: M2, M2.1, M3
>            Reporter: Martin Ritchie
>
> Summary:
> When using the Management Console to give a user (I used 'client') rights 
> ('admin' in this case) to the console on executing the action a 
> NullPointerException window is shown rather than 'Operation Successful'
> This is disconcerting for end users, howvever, the operation does indeed 
> complete successfully 

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