Program: 50022
Project: 50022
Buggy source:
@Override public void endElement(String uri,String localName,String qName) throws SAXException {
  super.endElement(uri,localName,qName);
  if (insideDataTag && !localName.equalsIgnoreCase("String_Node_Str")) {
    dataTagContent.append("String_Node_Str" + localName + "String_Node_Str");
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    messageQueue.put(hello);
    hello=null;
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    hello.setCapabilities(capabilities);
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideCapabilityTag=false;
    capabilities.add(Capability.getCapabilityByNamespace(capabilityTagContent.toString()));
    capabilityTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideSessionIdTag=false;
    hello.setSessionId(sessionIdTagContent.toString());
    sessionIdTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    messageQueue.put(reply);
    reply=null;
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideDataTag=false;
    reply.setContain(dataTagContent.toString());
    reply.setContainName("String_Node_Str");
    dataTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    reply.addError(error);
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorTypeTag=false;
    error.setType(ErrorType.valueOf(errorTypeTagContent.toString().toUpperCase()));
    errorTypeTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorTagTag=false;
    error.setTag(ErrorTag.valueOf(errorTagTagContent.toString()));
    errorTagTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorSeverityTag=false;
    error.setSeverity(ErrorSeverity.valueOf(errorSeverityTagContent.toString().toUpperCase()));
    errorSeverityTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorAppTagTag=false;
    error.setAppTag(errorAppTagTagContent.toString());
    errorAppTagTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorPathTag=false;
    error.setPath(errorPathTagContent.toString());
    errorPathTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorMessageTag=false;
    error.setMessage(errorMessageTagContent.toString());
    errorMessageTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorInfoTag=false;
    error.setInfo(errorInfoTagContent.toString());
    errorInfoTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideInterfaceInfoTag=false;
    reply.setContain(interfaceInfoTagContent.toString());
    reply.setContainName("String_Node_Str");
    interfaceInfoTagContent=new StringBuffer();
  }
}

Fixed version (ground truth):
@Override public void endElement(String uri,String localName,String qName) throws SAXException {
  super.endElement(uri,localName,qName);
  if (insideDataTag && !localName.equalsIgnoreCase("String_Node_Str")) {
    dataTagContent.append("String_Node_Str" + localName + "String_Node_Str");
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    messageQueue.put(hello);
    hello=null;
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    hello.setCapabilities(capabilities);
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideCapabilityTag=false;
    capabilities.add(Capability.getCapabilityByNamespace(capabilityTagContent.toString()));
    capabilityTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideSessionIdTag=false;
    hello.setSessionId(sessionIdTagContent.toString());
    sessionIdTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    messageQueue.put(reply);
    reply=null;
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideDataTag=false;
    reply.setContain(dataTagContent.toString());
    reply.setContainName("String_Node_Str");
    dataTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    reply.addError(error);
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorTypeTag=false;
    error.setType(ErrorType.getErrorTypeByValue(errorTypeTagContent.toString()));
    errorTypeTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorTagTag=false;
    error.setTag(ErrorTag.getErrorTagByValue((errorTagTagContent.toString())));
    errorTagTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorSeverityTag=false;
    error.setSeverity(ErrorSeverity.getErrorSeverityByValue(errorSeverityTagContent.toString()));
    errorSeverityTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorAppTagTag=false;
    error.setAppTag(errorAppTagTagContent.toString());
    errorAppTagTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorPathTag=false;
    error.setPath(errorPathTagContent.toString());
    errorPathTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorMessageTag=false;
    error.setMessage(errorMessageTagContent.toString());
    errorMessageTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideErrorInfoTag=false;
    error.setInfo(errorInfoTagContent.toString());
    errorInfoTagContent=new StringBuffer();
  }
  if (localName.equalsIgnoreCase("String_Node_Str")) {
    insideInterfaceInfoTag=false;
    reply.setContain(interfaceInfoTagContent.toString());
    reply.setContainName("String_Node_Str");
    interfaceInfoTagContent=new StringBuffer();
  }
}