Java DTD validation

Question

I am trying to validate an XML using a DTD which is already created, In the code below i would like to validate the XML. I have looked at a number of websites etc but i cannot work out how to put in the validation can someone please help. I am pulling my hair out.
public class validation {
BufferedReader in;
StreamResult out;
Document xmldoc;
Element root;
String xmlString;
public static void main (String args[]) {
new validation().doit();
public void doit () {
try{
     StringBuffer sBuffer = new StringBuffer();
     String str;
in = new BufferedReader(new FileReader("clinicSchedule.xml"));
out = new StreamResult("data.xml");
while ((str = in.readLine()) != null) {
          System.out.println(str);
sBuffer.append(str);
     in.close();
initXML(sBuffer.toString());
transformXML();
catch (Exception e) { e.printStackTrace(); }
public void initXML(String sFinalXML) throws ParserConfigurationException{
// JAXP + DOM
try
          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
          DocumentBuilder builder = factory.newDocumentBuilder();
          factory.setIgnoringComments(true); // We want to ignore comments
          factory.setNamespaceAware(true);
          factory.setValidating(true);
          // Now use the factory to create a DOM parser
          DocumentBuilder parser = factory.newDocumentBuilder();
          System.out.println(sFinalXML);
          xmldoc = parser.parse(new InputSource(new StringReader(sFinalXML)));
     }catch ( SAXParseException spe ) {
          System.err.println( "Parse error: " +
          spe.getMessage() );
          System.exit( 1 );
     catch (Exception ex) {
          ex.printStackTrace();
     public void transformXML()
          try{
               //Define source and destination Streams
               DOMSource domSource = new DOMSource(xmldoc);
               StreamResult myDestination=new StreamResult("output.html");
               StringWriter stringWriter=new StringWriter();
               //StreamResult myDestination=new StreamResult(stringWriter);
               //Define XSL source stream
               StreamSource myXSLSource=new StreamSource("emailStyle.xsl");
               //Create Transformer from Factory
               TransformerFactory myFactory =TransformerFactory.newInstance();
               //Transfooooooorm!!!
               Transformer myTransformer = myFactory.newTransformer(myXSLSource);
               myTransformer.transform(domSource, myDestination);
               //xmlString=stringWriter.toString();
          }catch(Exception e){
               e.printStackTrace();
}

Answer 1

There's a number of posts on this topic, so I'm not going to repeat it here. Please, check the following entries in this forum:
http://forum.java.sun.com/thread.jsp?forum=34&thread=158734
http://forum.java.sun.com/thread.jsp?forum=34&thread=159320
http://forum.java.sun.com/thread.jsp?forum=34&thread=172123
http://forum.java.sun.com/thread.jsp?forum=34&thread=153776
Good luck and - please - go easy on your hair.