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https://issues.apache.org/jira/browse/XALANJ-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765450#comment-13765450
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Gary Gregory commented on XALANJ-2576:
--------------------------------------

Are using the transformer from multiple threads?
                
> sporadic NPE when using XALAN transformer 
> ------------------------------------------
>
>                 Key: XALANJ-2576
>                 URL: https://issues.apache.org/jira/browse/XALANJ-2576
>             Project: XalanJ2
>          Issue Type: Bug
>      Security Level: No security risk; visible to anyone(Ordinary problems in 
> Xalan projects.  Anybody can view the issue.) 
>          Components: Xalan
>    Affects Versions: 2.7.1
>         Environment: Solaris X86
>            Reporter: Zhongyao Zhang
>            Assignee: Steven J. Hathaway
>            Priority: Minor
>
> This NPE does not happen very often. Don't how exactly to reproduce it. Post 
> it here to see if anyone came cross the same issue and have a solution for 
> it. I will also try the new version 2.7.2 to see if the issue has been fixed.
> WARNING java.lang.NullPointerException
>     at 
> org.apache.xalan.transformer.TransformerIdentityImpl.createResultContentHandler(TransformerIdentityImpl.java:302)
>     at 
> org.apache.xalan.transformer.TransformerIdentityImpl.flushStartDoc(TransformerIdentityImpl.java:934)
>     at 
> org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
>     at org.apache.xml.serializer.TreeWalker.startNode(TreeWalker.java:359)
>     at org.apache.xml.serializer.TreeWalker.traverse(TreeWalker.java:145)
>     at 
> org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:390)
>  

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