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1. Create a SchemaFactory instance.

SchemaFactory factory=SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

2. Create a Schema object from SchemaFactory.

Schema schema=factory.newSchema(schemaDocument);

3. Create a Validator object from Schema object.

Validator validator=schema.newValidator();

4. Create a class that implements the DefaultHandler.

private class ErrorHandlerImpl extends DefaultHandler	

   {		

       public boolean  validationError = false;	

       public SAXParseException saxParseException=null;

       

       public void error(SAXParseException exception) throws SAXException	

       {

           validationError = true;	

           saxParseException=exception;

       }		

       public void fatalError(SAXParseException exception) throws SAXException		

       {		

            validationError = true;	

            saxParseException=exception;	

       }		

       public void warning(SAXParseException exception) throws SAXException		

       {		

       }	

   }

5. Create a ErrorHandler object and set the ErrorHandler on the Validator object.

ErrorHandlerImpl errorHandler=new ErrorHandlerImpl();

validator.setErrorHandler(errorHandler);

6. Create a Document object either by parsing an XML document. Create a DOMSource object from the Document object.

DOMSource source = new DOMSource(document);

7. Validate the DOMSource object with Validator object.

validator.validate(source););

8. If XML document has validation errror, the validation error is output by the ErrorHandler.

if(errorHandler.validationError==true)

               System.out.println("XML Document has Error:"+errorHandler.validationError+" "+errorHandler.saxParseException.getMessage());

             else

               System.out.println("XML Document is valid");}