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https://issues.apache.org/jira/browse/JAMES-3709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482366#comment-17482366
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Ilja Weis commented on JAMES-3709:
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Hello, I have attached the error message + stack trace.
> Missing null check in POP3 TopCmdHandler
> ----------------------------------------
>
> Key: JAMES-3709
> URL: https://issues.apache.org/jira/browse/JAMES-3709
> Project: James Server
> Issue Type: Bug
> Components: protocols
> Affects Versions: master
> Reporter: Karsten Otto
> Priority: Major
> Attachments: error.txt
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> TopCmdHandler is missing a null check when retrieving the message content,
> i.e. the InputStream can be null, which results in an NPE down the line.
> Admittedly this is a rare case, I only observed this during heavy load
> testing.
> On closer inspection it turns out that TopCmdHandler duplicates a major
> portion of code from RetrCmdHandler, but with subtle differences such as the
> null check mentioned above.
> I propose to refactor the two classes to make them share the code, and
> provide unit tests for all possible error/success cases.
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