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http://issues.apache.org/bugzilla/show_bug.cgi?id=27827

Nested Extension Elements fails with NPE

           Summary: Nested Extension Elements fails with NPE
           Product: XalanJ2
           Version: CurrentCVS
          Platform: PC
        OS/Version: Windows NT/2K
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: org.apache.xalan.extensions
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


If you are using extension elements and an Extension Element has 
child elements that contain other Extension Elements, the inner 
extension element will fail.

I have traced the bug to the following thread

ElemExtensionCall#execute, when it tries to flushPending()
  from the Result Tree Handler.

ToSaxHandler#flushPending, m_needToCallStartDocument
is true, and a call to startDocumentInternal is made.

ToSaxHandler#startDocumentInternal, m_saxHandler is null
so the call to startDocument fails with an NPE.

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