[XALANJ-1628] NullPointerException in TransformerImpl.run() when reusing XMLFilter object

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.5Dx
• Component/s: SAX
• Security Level: No security risk; visible to anyone (Ordinary problems in Xalan projects. Anybody can view the issue.)
• Environment: Operating System: Windows NT/2K; Platform: PC
• Bugzilla Id: 22217
• Assignee: Unassigned
• Reporter: Gretchen Chiaramonte
• Created: 07/Aug/03 20:46
• Updated: 11/Aug/05 16:13

Description

Whenever I attempt to re-use an XMLFilter object, I receive the following stack
trace (first use of the XMLFilter was successful, so it doesn't appear to be my
XSL script):

Exception in thread "main" java.lang.RuntimeException:
java.lang.NullPointerException
at
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3364)
at
org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:427)
at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
at
org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xalan.transformer.TrAXFilter.parse(TrAXFilter.java:191)
at org.apache.xalan.transformer.TrAXFilter.parse(TrAXFilter.java:191)
at transform.Transform.doTransform(Transform.java:298)
at transform.Transform.doTransform(Transform.java:279)
at transform.Transform.main(Transform.java:204)

I traced this to the following line in TransformerImpl.applyTemplateToNode():

DTM dtm = m_xcontext.getDTM(child);

This appears to be returning null when the XMLFilter object is being used for
the second time. If I comment out the:

m_xcontext.reset();

line in TransformerImpl.reset(), then the problem seems to be resolved, and I am
able to re-use the same XMLFilter object many times.

I have seem a few other items out on Google speaking of the same issue, and one
poster stated he had this problem even with a simple modification to the
UseXMLFilters sample to run the parse() in a loop; so this should be very easy
to reproduce. If not, let me know, and I can pass on my code.