The root element is required in a well-formed document.

Stefan Geelen Sun, 28 Apr 2002 04:57:08 -0700

Hi,

I'am facing following problem:

In a servlet I want to read from a stream a xml document (the user defined in a form a local xml document with the 'browse' button in a 'file' input fiels <input type="file">).

The xmlstream in the code is defined as xmlstream = filePart.getInputStream (filePart is an instance of the filePart class in the com.oreilly.servlet.* package)

The corresponding xsl document is located on the server. the XSL systemid is correctly set.

I always get following message : The root element is required in a well-formed document.

This seems to me that the SAXParser does not automatically reads the bytes from the xmlstream.

I do have the impression that the SaxParser thinks the stream is empty !?

I understood from the API doc that the streal will automatically be read by Xalan.

Can anyone give me a hint ?

Please find below an excerpt of the code:

Thx,

Stefan

...

public void transform()
   throws TransformerException, TransformerConfigurationException,
            IOException, SAXException
{
   String media= null , title = null, charset = null;

   try
   {
          Transformer transformer ;
          PDXxml2pdf handler = new PDXxml2pdf();
          XMLReader reader ;
          SAXSource saxsource ;
          Source    xmlsource;
          Source    xslsource ;

          // Define xmlsource
          if (xmlstream != null)
              xmlsource = new StreamSource(xmlstream); // xmlstream is a defined inputstream

          // Since we're going to use a SAX feature, the transformer must support
          // input in the form of a SAXSource.
          TransformerFactory tfactory = TransformerFactory.newInstance();

          if(tfactory.getFeature(SAXSource.FEATURE)) {
            System.out.println("Activating DTD validation...");

// Standard way of creating an XMLReader in JAXP 1.1.
SAXParserFactory pfactory= SAXParserFactory.newInstance();

// Turn on support for XML namespaces.
pfactory.setNamespaceAware(true);

// Turn on validation.
pfactory.setValidating(true);

// Get an XMLReader.
reader = pfactory.newSAXParser().getXMLReader();

            // Instantiate an error handler (see the Handler inner class below) that will report any
            // errors or warnings that occur as the XMLReader is parsing the XML input.
            reader.setErrorHandler(handler);

// Specify a SAXSource that takes both an XMLReader and a URL.
saxsource = new SAXSource(reader, SAXSource.sourceToInputSource(xmlsource));

         } else {
           System.out.println("tfactory does not support SAX features! No DTD validation will be done");
           saxsource = new SAXSource(SAXSource.sourceToInputSource(xmlsource));
         }

         try { // Check if xml has link to stylesheet
           System.out.println("Looking for XSL file...");
           xslsource = tfactory.getAssociatedStylesheet(saxsource,media, title, charset);

           // Set system-id
           if (xslsystemid != null)
             xslsource.setSystemId(xslsystemid);

           transformer = tfactory.newTransformer(xslsource);

           try {
            transformer.transform(saxsource, new javax.xml.transform.sax.SAXResult(handler));
           } catch (Exception e) { //Error in transforming
             System.err.println("Error in transformer.transform method...");
             System.err.println("source: "+saxsource.toString());
          }

        } catch (Exception e) { //No stylesheet in xml

         if (xslfile != null)
           xslsource = new StreamSource(xslfile);
           if (xslsystemid != null)
             xslsystemid = xslfile.toString();
         }

         if (xslsource != null)
           transformer = tfactory.newTransformer(xslsource);
         else
           transformer = tfactory.newTransformer();

transformer.transform(saxsource, new javax.xml.transform.sax.SAXResult(handler));

}

The root element is required in a well-formed document.

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