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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=24826

Transformer.transform is not thread safe (with nested xslt's)

           Summary: Transformer.transform is not thread safe (with nested
                    xslt's)
           Product: XalanJ2
           Version: 2.3Dx
          Platform: PC
        OS/Version: Windows NT/2K
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: org.apache.xalan.transformer
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


XSLT example (simplified) :

<xsl:stylesheet ....>
<!-- some common templates -->
   <xsl:import ...>
<!-- rest of the file -->
</xsl:stylesheet>

Code example (simplified):

    synchronized Transformer resolveTransformer (String transformationCode) [
        Templates template = getFromTheCacheOrCreate (transformationCode);
        return template.newTransformer ();
    }

    Transformer transformer = resolveTransformer (transformationCode);
    transformer.transform (src, dst); // NullPointer exception processing inner 
xslt,
                                      // if the same template was used by more 
than one thread.

    synchronized (transformer) {
       transformer.transform (src, dst); // All fine.
    }

Documentation says, that Transformer object is reentrant and thread safe.

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