import org.apache.xerces.parsers.XMLParser; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import org.xml.sax.helpers.DefaultHandler; public class XMLValidator { public static void main(String[] args) { try { XMLParser parser = new XMLParser(); parser.setFeature("http://apache.org/xml/features/validation/schema", true); parser.setProperty("http://apache.org/xml/properties/schema/external-schemaLocation", "schema.xsd"); DefaultHandler handler = new DefaultHandler() { @Override public void error(SAXParseException e) throws SAXException { System.out.println("Error: " + e.getMessage()); } @Override public void warning(SAXParseException e) throws SAXException { System.out.println("Warning: " + e.getMessage()); } @Override public void fatalError(SAXParseException e) throws SAXException { System.out.println("Fatal Error: " + e.getMessage()); } }; parser.setErrorHandler(handler); parser.parse("data.xml"); System.out.println("XML validation successful."); } catch (Exception e) { e.printStackTrace(); } } }