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From "Thomas Hinterndorfer (JIRA)" <j...@apache.org>
Subject [jira] Created: (JSPWIKI-324) ReferenceManager throws NullPointerException when renaming read-only page
Date Wed, 30 Jul 2008 07:49:31 GMT
ReferenceManager throws NullPointerException when renaming read-only page
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                 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
            Priority: Minor


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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