Detecting transform errors when using org.xml.sax.XMLFilter

Question

I am using javax.xml.transform.sax.SAXTransformerFactory.newXMLFilter to transform xml against a pipeline of stylesheets (See function testPipelineTransform in the example below). The process works okay, excepting that I cannot figure out how to detect errors in the transformation process.
I would like to achieve the same result for the pipeline process as I would for a single transformation using javax.xml.transform.Transformer.setErrorListener. The example below demonstrates how the call to javax.xml.transform.Transformer.setErrorListener does not generate the same result when using org.xml.sax.XMLFilter as it does when using a single transformation.
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.XMLFilter;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import java.io.*;
public class FilterChain {
    static private final String newline = System.getProperty("line.separator");
     public static void main(String argv[]) {
          System.out.println("Testing pipeline transform");
          testPipelineTransform();
          System.out.println("Testing single transform");
          testXsltSingleTransform();
     } // main
     static private void testPipelineTransform() {
          try {
               // Set up the input stream
               BufferedInputStream bis = new BufferedInputStream(
                         new ByteArrayInputStream(getExample().getBytes()));
               InputSource input = new InputSource(bis);
               // Set up to read the input file
               SAXParserFactory spf = SAXParserFactory.newInstance();
               SAXParser parser = spf.newSAXParser();
               XMLReader reader = parser.getXMLReader();
               // Create the filters
               SAXTransformerFactory stf = (SAXTransformerFactory) TransformerFactory
                         .newInstance();
               XMLFilter filter1 = stf.newXMLFilter(new StreamSource(new StringReader(getStylesheet1())));
               XMLFilter filter2 = stf.newXMLFilter(new StreamSource(new StringReader(getStylesheet2())));
               // Wire the output of the reader to filter1
               // and the output of filter1 to filter2
               filter1.setParent(reader);
               filter2.setParent(filter1);
               // Set up the output stream
               StreamResult result = new StreamResult(System.out);
               // Set up the transformer to process the SAX events generated
               // by the last filter in the chain
               Transformer transformer = stf.newTransformer();
               transformer.setErrorListener(new ErrorListener() {
                    public void error(TransformerException te)
                              throws TransformerException {
                         System.out.println("Transform generated Transform Error");
                         System.out.println(te.getMessage());
                    public void fatalError(TransformerException te)
                              throws TransformerException {
                         System.out
                                   .println("Transform generated Transform Fatal Error");
                         System.out.println(te.getMessage());
                    public void warning(TransformerException te)
                              throws TransformerException {
                         System.out.println("Transform generated Transform Warning");
                         System.out.println(te.getMessage());
               SAXSource transformSource = new SAXSource(filter2, input);
               transformer.transform(transformSource, result);
          } catch (TransformerConfigurationException tce) {
               // Error generated by the parser
               System.out.println("\n** Transformer Factory error");
               System.out.println("   " + tce.getMessage());
               // Use the contained exception, if any
               Throwable x = tce;
               if (tce.getException() != null)
                    x = tce.getException();
               x.printStackTrace();
          } catch (TransformerException te) {
               // Error generated by the parser
               System.out.println("\n** Transformation error");
               System.out.println("   " + te.getMessage());
               // Use the contained exception, if any
               Throwable x = te;
               if (te.getException() != null)
                    x = te.getException();
               x.printStackTrace();
          } catch (SAXException sxe) {
               // Error generated by this application
               // (or a parser-initialization error)
               Exception x = sxe;
               if (sxe.getException() != null)
                    x = sxe.getException();
               x.printStackTrace();
          } catch (ParserConfigurationException pce) {
               // Parser with specified options can't be built
               pce.printStackTrace();
     static private void testXsltSingleTransform() {
          try {
               BufferedInputStream bis = new BufferedInputStream(
                         new ByteArrayInputStream(getExample().getBytes()));
               // Set up the output stream
               StreamResult result = new StreamResult(System.out);
               InputSource input = new InputSource(bis);
               TransformerFactory factory = TransformerFactory.newInstance();
               Source source = new StreamSource(new StringReader(getStylesheet2()));
               Transformer stylesheet = factory.newTransformer(source);
               stylesheet.setErrorListener(new ErrorListener() {
                    public void error(TransformerException te)
                              throws TransformerException {
                         System.out.println("Transform generated Transform Error");
                         System.out.println(te.getMessage());
                    public void fatalError(TransformerException te)
                              throws TransformerException {
                         System.out
                                   .println("Transform generated Transform Fatal Error");
                         System.out.println(te.getMessage());
                    public void warning(TransformerException te)
                              throws TransformerException {
                         System.out.println("Transform generated Transform Warning");
                         System.out.println(te.getMessage());
               SAXSource transformSource = new SAXSource(input);
               stylesheet.transform(transformSource, result);
          } catch (Exception exc) {
               exc.printStackTrace();
     private static String getStylesheet1() {
          return
                 "<?xml version='1.0' encoding='ISO-8859-1'?>" + newline
               + "<xsl:stylesheet" + newline
               + "xmlns:xsl='http://www.w3.org/1999/XSL/Transform'" + newline
               + "version='1.0'>" + newline
               + "<xsl:output method='xml'/>" + newline
               + "<xsl:template match='/'>" + newline
               + "<DontCareAboutContent></DontCareAboutContent>" + newline
               + "</xsl:template>" + newline
               + "</xsl:stylesheet>" + newline;
     private static String getStylesheet2() {
          return
                 "<?xml version='1.0' encoding='ISO-8859-1'?>" + newline
               + "<xsl:stylesheet" + newline
               + "xmlns:xsl='http://www.w3.org/1999/XSL/Transform'" + newline
               + "version='1.0'>" + newline
               + "<xsl:output method='html'/>" + newline
               + "<xsl:template match='/'>" + newline
              + "<html><body>" + newline
             + "<xsl:message>" + newline
             + "Error Message for the xslt processor" + newline
             + "</xsl:message>" + newline
             + "Dont care about the xslt content," + newline
             + "The only significant part is the xsl:message element" + newline
             + "which results in a error to be handled by the xslt" + newline
             + "processor" + newline
               + "</body></html>" + newline
               + "</xsl:template>" + newline
               + "</xsl:stylesheet>" + newline;
     private static String getExample() {
          return
                 "<?xml version='1.0' encoding='ISO-8859-1'?>" + newline
               + "<DontCareAboutContent>" + newline
               + "</DontCareAboutContent>" + newline;
}

Answer 1

I made the following change which solves the problem but the sollution is tightly coupled to Xalan. If anyone has any ideas, I would still like to find a way to achieve the desired result using JAXP API's.
               XMLFilter filter1 = stf.newXMLFilter(new StreamSource(new StringReader(getStylesheet1())));
               if (filter1 instanceof org.apache.xalan.transformer.TrAXFilter) {
                    ((org.apache.xalan.transformer.TrAXFilter)filter1).getTransformer().setErrorListener(...);
...