SAX / Validating XML file...

Question

Hello,
I would like to use the SAX Parser to validate a XML file. So I've downloaded the last sax.jar library and included it in the java 1.4 directory.
If I set the setvalidating flag to false the parser is working great and i have good results. However I would like to validate the XML file with a XML Schema (that can be accessed using the web). So I saw the Sun tutorial for doing that but have a terrible error ! :
java.lang.ClassCastException
     at org.apache.xerces.impl.xs.XMLSchemaValidator.reset(XMLSchemaValidator.java:1332)
and don't understand why, can somebody help me ????
public class AgentHandler
    extends DefaultHandler
    implements ContentHandler {
  private boolean isAgent;
  private boolean isAgentViaProxy;
  private AgentTable agentTable;
  private String agent;
  private String proxy;
  static final String JAXP_SCHEMA_LANGUAGE =
      "http://java.sun.com/xml/jaxp/properties/schemaLanguage";
  static final String W3C_XML_SCHEMA =
      "http://www.w3.org/2001/XMLSchema";
  static final String JAXP_SCHEMA_SOURCE =
      "http://java.sun.com/xml/jaxp/properties/schemaSource";
  private String representation;
  private StringBuffer content = new StringBuffer();
  MimeBodyPart part;
  Unit currentUnit;
  Consumer nextConsumer;
  protected Object object;
  public AgentTable getAgentTable() {
    ErrorHandler errorHandler = new MyErrorHandler();
    content.setLength(0);
    agentTable = new AgentTable();
    SAXParserFactory factory = SAXParserFactory.newInstance();
    factory.setNamespaceAware(true);
    factory.setValidating(true);
    SAXParser saxParser = null;
    try {
      saxParser = factory.newSAXParser();
    catch (ParserConfigurationException ex1) {
      ex1.printStackTrace();
    catch (SAXException ex1) {
      ex1.printStackTrace();
    try {
      saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
//agentfile.xml is the XML Schema
saxParser.setProperty(
     "http://apache.org/xml/properties/schema/external-schemaLocation",
          new File(
          "http://localhost:8080/agentfile.xml"));
    catch (SAXNotSupportedException ex3) {
      ex3.printStackTrace();
    catch (SAXNotRecognizedException ex3) {
      ex3.printStackTrace();
    org.xml.sax.XMLReader xmlReader = null;
    try {
      xmlReader = saxParser.getXMLReader();
    catch (SAXException ex) {
      ex.printStackTrace();
    xmlReader.setContentHandler(this);
    xmlReader.setErrorHandler(errorHandler);
    try {
      xmlReader.parse(new org.xml.sax.InputSource(jamap.share.Constants.homeDir +
                                                  jamap.share.Constants.
                                                  AgentFile));
    catch (SAXException ex2) {
      ex2.printStackTrace();
      System.out.println("Error in parsing the agent.xml file");
    catch (IOException ex2) {
      ex2.printStackTrace();
      System.out.println("Error in parsing the agent.xml file");
    return agentTable;
  }any idea ???
Thanks...
PA

Answer 1

Hello,
I did some modifications and now it is working : the setproperty was not properly called before....
Now I have an other problem : in fact the parser doesn't ignore the white spaces, even if I put an ignorableWhitespace method inside the handler : have you any idea to remove these new lines or spaces automatically during the parsing ????
TU...
PA
public AgentTable getAgentTable() {
    ErrorHandler errorHandler = new MyErrorHandler();
    content.setLength(0);
    agentTable = new AgentTable();
    SAXParserFactory factory = SAXParserFactory.newInstance();
    factory.setNamespaceAware(true);
    factory.setValidating(true);
    SAXParser saxParser = null;
    try {
      saxParser = factory.newSAXParser();
    catch (ParserConfigurationException ex1) {
      ex1.printStackTrace();
    catch (SAXException ex1) {
      ex1.printStackTrace();
    try {
      saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
      try {
        saxParser.setProperty(
            "http://java.sun.com/xml/jaxp/properties/schemaSource",
            new org.xml.sax.InputSource("http://localhost:8080/agentfile.xml")
      catch (SAXNotRecognizedException ex4) {
      catch (SAXNotSupportedException ex4) {
    catch (SAXNotSupportedException ex3) {
      ex3.printStackTrace();
    catch (SAXNotRecognizedException ex3) {
      ex3.printStackTrace();
    org.xml.sax.XMLReader xmlReader = null;
    try {
      xmlReader = saxParser.getXMLReader();
    catch (SAXException ex) {
      ex.printStackTrace();
    xmlReader.setContentHandler(this);
    xmlReader.setErrorHandler(errorHandler);
    try {
      xmlReader.parse(new org.xml.sax.InputSource(jamap.share.Constants.homeDir +
                                                  jamap.share.Constants.
                                                  AgentFile));
    catch (SAXException ex2) {
      ex2.printStackTrace();
      System.out.println("Error in parsing the agent.xml file");
    catch (IOException ex2) {
      ex2.printStackTrace();
      System.out.println("Error in parsing the agent.xml file");
    return agentTable;