Validate.java

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.xml.XMLConstants;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class ValidateTest {

	private static final String URL = "https://raw.github.com/gist/29ff06c0720988d3d72a/b3f2deaa13bc2837504764b60b185267ffcaddc8/atomic.xml";
	private static final String SCH_URL = "https://raw.github.com/gist/29ff06c0720988d3d72a/af6ec6b9410ded5b9b25bfd3bd4c1577d373c5e1/atomic.xsd";

	public static void main(String[] args) throws SAXException, IOException {
		notWorking();
		working();
	}

	public static void notWorking() throws  IOException,
			MalformedURLException, SAXException {
		final SchemaFactory sf = SchemaFactory
				.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
		final Schema schema = sf.newSchema();
		final Source s = new StreamSource(new URL(URL).openStream());
		final Validator v = schema.newValidator();
		v.setErrorHandler(new Eh());
		try {
			v.validate(s);
		} catch (final SAXException e) {
			System.err.println("Implicit schema: Could not validate");
			System.err.println("\t" + e.getMessage());
		}
	}
	/** setting explicitly works: */
	public static void working() throws SAXException, IOException,
			MalformedURLException {
		final SchemaFactory sf = SchemaFactory
				.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
		final Schema schema = sf.newSchema(new URL(SCH_URL));
		final Source s = new StreamSource(new URL(URL).openStream());
		final Validator v = schema.newValidator();
		v.setErrorHandler(new Eh());
		try {
			v.validate(s);
		} catch (final SAXException e) {
			// TODO Auto-generated catch block
			System.err.println("Could not validate");
			e.printStackTrace();
		}
		System.out.println("Validated with explicit declaration");

	}

	/** ugly error handler */
	private static final class Eh implements ErrorHandler {
		@Override
		public void fatalError(SAXParseException exception) throws SAXException {
			throw exception;
		}

		@Override
		public void error(SAXParseException exception) throws SAXException {
			throw exception;
		}

		@Override
		public void warning(SAXParseException exception) throws SAXException {
			// TODO Auto-generated method stub
		}
	}

}