sax

public static boolean validate(String xml)throws ParserConfigurationException, IOException, org.xml.sax.SAXException{

        try {

            SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setValidating(true);
            factory.setNamespaceAware(true);

            SAXParser parser = factory.newSAXParser();

            XMLReader reader = parser.getXMLReader();
            reader.setErrorHandler(
                new ErrorHandler() {
                    @Override
                    public void warning(SAXParseException e) throws SAXException {
                      System.out.println("WARNING : " + e.getMessage()); // do nothing
                    }

                    @Override
                    public void error(SAXParseException e) throws SAXException {
                      System.out.println("ERROR : " + e.getMessage());
                      throw e;
                    }

                    @Override
                    public void fatalError(SAXParseException e) throws SAXException {
                      System.out.println("FATAL : " + e.getMessage());
                      throw e;
                    }
                }
            );

            reader.parse(new InputSource( xml ));

            return true;

        }
        catch (ParserConfigurationException | IOException pce) {

            throw pce;

        }
        catch (SAXException se){

            return false;

        }

    }