FULL PRODUCT VERSION :
1.6

ADDITIONAL OS VERSION INFORMATION :
Linux chopsuey.nyc.corp.google.com 2.6.18.5-gg7-mixed64-32 #1 SMP Tue Feb 13 18:07:55 GMT 2007 x86_64 GNU/Linux


EXTRA RELEVANT SYSTEM CONFIGURATION :
not applicable

A DESCRIPTION OF THE PROBLEM :
Parse an XML document using SAX (xerces) with an undefined entity &idontexist;

I expect to have ContentHandler#skippedEntity called with a stack trace something like this (as happens with java 1.5):

 at com.google.gxp.compiler.parser.SaxXmlParser$SaxEventAdapter.skippedEntity(SaxXmlParser.java:219)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startGeneralEntity(AbstractSAXParser.java:419)
        at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startGeneralEntity(XMLDTDValidator.java:1089)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.startEntity(XMLDocumentFragmentScannerImpl.java:634)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.startEntity(XMLDocumentScannerImpl.java:531)
        at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:746)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEntityReference(XMLDocumentFragmentScannerImpl.java:1334)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1756)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)
        at com.google.gxp.compiler.parser.SaxXmlParser.parse(SaxXmlParser.java:56)

instead skippedEntity() is NOT called.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
see Description

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
see Description
ACTUAL -
see Description

ERROR MESSAGES/STACK TRACES THAT OCCUR :
not applicable

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.google.hjh;

import java.io.*;

import org.xml.sax.*;
import org.xml.sax.helpers.XMLReaderFactory;

/**
 * This program demonstrates a bug in JDK 1.6.
 *
 * With JDK 1.5.0_06 it will output OK!
 * With JDK 1.6.0_01 it will output FAIL!
 *
 * @author ###@###.### (Harry Heymann)
 */
public class XercesBug {

  private static final String BAD_ENTITY = "badentity";

  public static void main(String[] args) throws Exception {
    //System.setProperty("org.xml.sax.driver",
    // "org.apache.xerces.parsers.SAXParser");

    SaxEventHandler saxEventHandler = new SaxEventHandler();

    XMLReader xmlReader = XMLReaderFactory.createXMLReader();
    xmlReader.setContentHandler(saxEventHandler);
    xmlReader.setEntityResolver(saxEventHandler);
    xmlReader.parse(getDocument());

    if (BAD_ENTITY.equals(saxEventHandler.getSkippedEntity())) {
      System.out.println("OK!");
    } else {
      System.out.println("FAIL!");
    }
  }

  private static InputSource getDocument() {
    StringBuilder sb = new StringBuilder();

    sb.append("<!DOCTYPE tag SYSTEM \"http://google.com/test/external.ent\">");
    sb.append("<tag>");
    sb.append("&" + BAD_ENTITY + ";");
    sb.append("</tag>");

    return new InputSource(new StringReader(sb.toString()));
  }

  private static class SaxEventHandler
      implements ContentHandler, EntityResolver {

    private String skippedEntity = null;

    public String getSkippedEntity() {
      return skippedEntity;
    }

    /**
     * This is the real center of the bug. JDK 1.6.0_01 is failing to
     * call this function for some unknown reason.
     */
    public void skippedEntity(String name) {
      skippedEntity = name;
    }

    public InputSource resolveEntity(String publicId, String systemId) {
      InputSource result = new InputSource(new StringReader(""));
      result.setPublicId(publicId);
      result.setSystemId(systemId);
      return result;
    }

    public void setDocumentLocator(Locator locator) {
    }

    public void startDocument() {
    }

    public void endDocument() {
    }

    public void startPrefixMapping(String prefix, String uri) {
    }

    public void endPrefixMapping(String prefix) {
    }

    public void startElement(String nsUri, String localName, String qName,
                             Attributes saxAttrs) {
    }

    public void endElement(String nsUri, String localName, String qName) {
    }

    public void characters(char[] ch, int start, int length) {
    }

    public void ignorableWhitespace(char ch[], int start, int length) {
    }

    public void processingInstruction(String target, String data) {
    }
  }
}
---------- END SOURCE ----------