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[list4xt] Null pointer exception in XT

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I believe I have an unsafe thread condition. Below is the stack trace for
a very repeatable condition when I don't synchronize calls to the
transformation process. Before I start wading through the code, can
anyone tell me what type of XSLT might be the cause? For example,
node-set or copy-of or ...
Thanks in advance.
Larry

XSLT error:java.lang.NullPointerException

java.lang.NullPointerException
        at
com.jclark.xsl.sax.MultiNamespaceResult.endElementContent(MultiNamespaceResult.java,
Compiled Code)
        at com.jclark.xsl.sax.ResultBase.endElement(ResultBase.java,
Compiled Code)
        at com.jclark.xsl.tr.CopyAction.invoke(CopyAction.java, Compiled
Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.processSafe(ProcessContextImpl.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.process(ProcessContextImpl.java,Compiled
Code)
        at com.jclark.xsl.tr.ProcessAction.invoke(ProcessAction.java,
Compiled Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at
com.jclark.xsl.tr.LiteralElementAction.invoke(LiteralElementAction.java,
Compiled Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.processSafe(ProcessContextImpl.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.process(ProcessContextImpl.java,Compiled
Code)
        at com.jclark.xsl.tr.ProcessAction.invoke(ProcessAction.java,
Compiled Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.processSafe(ProcessContextImpl.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.process(ProcessContextImpl.java,Compiled
Code)
        at com.jclark.xsl.tr.ProcessAction.invoke(ProcessAction.java,
Compiled Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at com.jclark.xsl.tr.CopyAction.invoke(CopyAction.java, Compiled
Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.processSafe(ProcessContextImpl.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.process(ProcessContextImpl.java,Compiled
Code)
        at com.jclark.xsl.tr.ProcessAction.invoke(ProcessAction.java,
Compiled Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at com.jclark.xsl.tr.IfAction.invoke(IfAction.java, Compiled Code)
        at com.jclark.xsl.tr.IfAction.invoke(IfAction.java, Compiled Code)
        at com.jclark.xsl.tr.AppendAction.invoke(AppendAction.java,
Compiled Code)
        at
com.jclark.xsl.tr.ProcessContextImpl.processSafe(ProcessContextImpl.java,
Compiled Code)
        at com.jclark.xsl.tr.SheetImpl.process(SheetImpl.java, Compiled
Code)
        at
com.jclark.xsl.sax.XSLProcessorImpl.parse(XSLProcessorImpl.java, Compiled
Code)

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