Re: Runtime exception thrown while using XsltFilter in pipeline

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Artur Matos wrote:
> I have just started using JAXP (GNU or otherwise), so
> first of all I am sorry if this is a rather basic
> question. I am trying to build a very simple pipeline
> with the gnu.xml.pipeline package: basically for
> reading an input XML file, processing it via XSLT, and
> displaying the transformation in the standard output.
> The problem is that my program always throws a
> java.lang.RuntimeException at the XSLT stage,
> something like this:
>
> Exception in thread "main" java.lang.RuntimeException
>         at
> org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java: 
> 3407)
>         at
> org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(Transfo 
> rmerHandlerImpl.java:433)
>         at
> gnu.xml.aelfred2.SAXDriver.parse(SAXDriver.java:334)
>         at
> gnu.xml.aelfred2.XmlReader.parse(XmlReader.java:294)
>         at
> org.deriva.pipeliner.Pipeliner.main(Pipeliner.java:63)
>
> Both program and used files can be found at the end of
> this message. I have tried to change the XSLTFilter
> step for other stages and it works perfectly, so the
> problem should lie there. I have also tried with
> different SAXDrivers and XSLT processors -- Xerces,
> Xalan and SAXON -- and I always have the same problem.
> I have also tried to transform the document from the
> command line, with both xsltproc and the xalan command
> line utility and it works perfectly with both.

This does look very much like a problem in Xalan. Have you examined the  
source for Xalan TransformerImpl?

You could also try with libxmlj. Set the system properties
    
javax.xml.parsers.SAXParserFactory=gnu.xml.libxmlj.sax.GnomeSAXParserFac 
tory
    
javax.xml.parsers.TransformerFactory=gnu.xml.libxmlj.transform.GnomeTran 
sformerFactory

and use the standard JAXP factory methods to obtain an XMLReader (via  
SAXParserFactory) and Transformer.
- -- 
Chris Burdess
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