Instead of parsing the schema with DOM/SAX, just loading it with URL worked with JBoss. But I don’t know how and why? here is the sample code: URL schemaURL = Thread.currentThread().getContextClassLoader().getResource(WSConstants.BOOKING_SCHEMA_FILE); SchemaFactory provBookingSchemaFactory = schemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); provBookingSchemaFactory.setErrorHandler(new InvalidXMLErrorHandler()); Schema provBookingSchema = provBookingSchemaFactory.newSchema(schemaURL); Validator provBookingValidator = provBookingSchema.newValidator(); provBookingValidator.validate(new DOMSource(requestDoc)); Earlier I was creating the schema instance using the DOM source:- Schema provBookingSchema = provBookingSchemaFactory.newSchema(new DOMSource(schemaDoc)); View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4211697#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...