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https://issues.apache.org/jira/browse/JSPWIKI-324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619428#action_12619428
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Thomas Hinterndorfer commented on JSPWIKI-324:
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I am not using JSPWiki's ACLs, but the ones from our CMS. So the wiki itself
doesn't "know" the permissions. It either gets read or read/write access or
doesn't, in which case the page is treated like a non-existent. So the problem
is, if you sign in with Account B, wiki gets read-access to page A, therefore
its an existing page, but wiki cannot change it, when trying to update the
link. So the RefMgr may be in an inconsistent state and that causes the NPE, if
you rename page A.
> ReferenceManager throws NullPointerException when renaming read-only page
> -------------------------------------------------------------------------
>
> Key: JSPWIKI-324
> URL: https://issues.apache.org/jira/browse/JSPWIKI-324
> Project: JSPWiki
> Issue Type: Bug
> Components: Core & storage
> Affects Versions: 2.6.2
> Environment: RHEL 5.1, Apache Tomcat 6.0.16, JSPWiki 2.6.2
> Reporter: Thomas Hinterndorfer
> Assignee: Harry Metske
> Priority: Minor
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> I am using custom Page and Attachment Providers, so this issue may not be
> recreatable in other environments.
> These providers store the contents in the CMS of the company, i am working
> for.
> I have 2 pages, created by different users, linking each other. If i change
> the ACL (in the CMS) for page A, so the other user may only read, but not
> change it, then rename page B with the user, who may only read page A, the
> referring link on page A is not updated, because the user doesn't have write
> permissions. But if i then rename page A, i get a NullPointerException from
> the ReferenceManager (the page name is updated correctly), it's only
> confusing for users to get an error, and other references to the page aren't
> updated too. If i restart JSPWiki after renaming page B, there's no error. So
> i guess, the ReferenceManager is trying to update the link, it fails due to
> the lack of permissions, and the ReferenceManager stores wrong information
> and tries to update non-existing references when renaming page A. This would
> explain why there's no error after restarting, because the references are
> rebuilt.
> Text from Error.jsp:
> Error Message
> An unknown exception java.lang.NullPointerException was caught by
> Error.jsp.
> Exception
> java.lang.NullPointerException
> Place where detected
> com.ecyrd.jspwiki.ReferenceManager.clearPageEntries(), line 885
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