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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=11125

Threading issue can cause NPE in DOM

           Summary: Threading issue can cause NPE in DOM
           Product: Xerces2-J
           Version: 2.0.2
          Platform: All
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: DOM
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


In the method "Node nodeListItem(int index)" in ParentNode.java it 
calls "ownerDocument.getNodeListCache(this);". To set the 
variable "fNodeListCache".
In CoreDocumentImpl.java in the method "NodeListCache getNodeListCache
(ParentNode owner)" it may set the "fNodeListCache" to null.
These lines could cause the problem:
if (c.fOwner != null) {
   c.fOwner.fNodeListCache = null;
}
c.fOwner = owner;


Under heavy load with many threads it is possible to the "fNodeListCache" to be 
null and cause a null pointer exception in ParentNode.java.
Does it need to set the variable to null when it will be set a few lines later?
Where else is this method being called?

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