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From "Harry Metske (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JSPWIKI-324) ReferenceManager throws NullPointerException when renaming read-only page
Date Sun, 03 Aug 2008 11:25:45 GMT

    [ https://issues.apache.org/jira/browse/JSPWIKI-324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619319#action_12619319
] 

Harry Metske commented on JSPWIKI-324:
--------------------------------------

I was not able to recreate this problem on 2.7.0-alpha-7 (my personal wiki) nor on v2.8.0-alpha-1
(sandbox.jspwiki.org).
They both use the VersioningFileProvider.

You can try it yourself on the sandbox if you want:
- create account A
- login with A
- create page A with ACL: [{ALLOW edit accountA}] and pagelink to page B
- logout
- create account B
- create page B
- rename page B

No NPE's, referring links are updated.

> 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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