Validating XML in SAX

Question

Hi
How should i validate the XML. I have a XSD (schema ) and i am using the "SAX parser".
The following is the portion of code written to call the SAX parser
RequestHandler rh = new RequestHandler(); -> I mentioned this class below
TextMessage textMessage = (TextMessage) msg; --> "msg" has XML file
String txt = textMessage.getText();
try {
SAXParserFactory fact = SAXParserFactory.newInstance();
SAXParser sp = fact.newSAXParser();
InputSource inSource = new InputSource();
inSource.setCharacterStream(new StringReader(txt));
sp.parse(inSource, rh);
The following class i am using to parse the XML .. this has all methods like startDocument,startElelment,endElelment,characters .. etc., etc., etc.,
public class RequestHandler extends DefaultHandler {
Please some one let me know how to validate .. i have XSD's which was given by another team .. i do not know how to validate XML against XSD (schema) using SAX parser
any sample code or good links validate the XML against the XSD in SAX parser would be greatly healpful..
Thanks,..

Answer 1

Thanks so much ashettleroe ..
Now i am adding the validation part .. i added piece of code which validate the XML but i am not too sure this is the write way or not ..
My XML has 4 schemas (xsd) i am using setProperty.. i guess setSchema will work too according to your reply
what i should use in sp.setProperty("http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation","?????????? ");
I have a XML with 4 schemas (xsd) .. which means i need to mention every schema individually ?
All My XML starts with the below mentioned 4 XSD.
<SubscriberNotification xmlns:cng="http://test.com/CSI/Namespaces/Types/Public/CingularDataModel.xsd"
xmlns="http://test.com/ATLAS/Namespaces /Container/JMS/SubscriberNotification.xsd"
xmlns:sn="http://test.com/ATLAS/Namespaces/Container/Public/SubscriberNotification.xsd"
xmlns:mh="http://test.com/ATLAS/Namespaces/Container/Public/MessageHeader.xsd">
This is my Bean (MDB) Code:
public class MedBean extends GenericMessageDrivenBean implements MessageDrivenBean, MessageListener
public void onMessage(Message msg) {
/* Object for the Defaulthandler Class */
RequestHandler rh = new RequestHandler();
try {
TextMessage textMessage = (TextMessage) msg;
String txt = textMessage.getText();
     SAXParserFactory fact = SAXParserFactory.newInstance();
// Validating the XML
fact.setNamespaceAware(true);
fact.setValidating(true);
fact.setFeature("http://xml.org/sax/features/validation", true);
fact.setFeature("http://apache.org/xml/features/validation/schema",true);
fact.setFeature("http://apache.org/xml/features/validation/schema-full-checking", true);
SAXParser sp = fact.newSAXParser();
// Validation Part
/* I have a question in this line */
sp.setProperty("http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation","???????????");
InputSource inSource = new InputSource();
inSource.setCharacterStream(new StringReader(txt));
sp.parse(inSource, rh); // Call the DefaulHandler to parse the XML
}catch(JMSException ex) {
ex.printStackTrace();
}catch(SAXNotRecognizedException x){
     //happens is if the parser does not support JAXP 1.2
     x.getMessage();
}catch(SAXParseException spe){
     //Error generated by the parser
     System.out.println("\n** Parsing error" + ", line " + spe.getLineNumber()
     + ", uri " + spe.getSystemId());
System.out.println(" " + spe.getMessage());     
//      Use the contained exception, if any
     Exception x = spe;
     if (spe.getException() != null)
     x = spe.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 (IOException ioe) {
     // I/O error
ioe.printStackTrace();
}catch (Throwable t){
t.printStackTrace();
}/*catch (Exception e) {
System.out.println(" Exception in OnMessage() :");
e.printStackTrace();
return;
} // End of OnMessage()
} // End of the Bean MedBean()