De las pocas cosas que me gustan de java… esta su parser SAX…..que tambien valida esquemas….

import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.w3c.dom.Document;

public class ValidateXmlWithSchema{

	public boolean validate(String file_path){

		boolean valor_retono = true;

		final String JAXP_SCHEMA_LANGUAGE = "http://java.sun.com/xml/jaxp/properties/schemaLanguage";
	    final String JAXP_SCHEMA_SOURCE = "http://java.sun.com/xml/jaxp/properties/schemaSource";
		final String W3C_XML_SCHEMA = "http://www.w3.org/2001/XMLSchema";
		final String MY_SCHEMA = new OsVars().getSchemaDir() + "cfdv2.xsd";
		final String MY_XML= file_path;

		// Creando la factoria e indicando que hay validacion
		DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
		documentBuilderFactory.setNamespaceAware(true);
		documentBuilderFactory.setValidating(true);

		try {

			//Configurando el Schema de validacion
			documentBuilderFactory.setAttribute(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
			documentBuilderFactory.setAttribute(JAXP_SCHEMA_SOURCE, new File(MY_SCHEMA));
			// Parseando el documento
			DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
			documentBuilder.setErrorHandler(new ParserErrorHandler());

			@SuppressWarnings("unused")
			Document parse = documentBuilder.parse(new File(MY_XML));

		} catch (SAXException saxEx){
			valor_retono =  false;
			System.out.println(saxEx.toString());
		} catch (Exception ex) {
			valor_retono =  false;
			System.out.println(ex.toString());
		}

		return valor_retono;
	}

	private class ParserErrorHandler extends DefaultHandler {

		@Override
		public void warning(SAXParseException e) throws SAXException {
			System.out.println("Warning: ");
			printInfo(e);
		}

		@Override
		public void error(SAXParseException e) throws SAXException {
			System.out.println("Error: ");
			printInfo(e);
		}

		@Override
		public void fatalError(SAXParseException e) throws SAXException {
			System.out.println("Error Fatal: ");
			printInfo(e);
		}
		private void printInfo(SAXParseException e) {
			System.out.println("   Publico ID: "+e.getPublicId());
			System.out.println("   Sistema ID: "+e.getSystemId());
			System.out.println("   Linea numero: "+e.getLineNumber());
			System.out.println("   Columna number: "+e.getColumnNumber());
			System.out.println("   Mensaje: "+e.getMessage());
		}
	}

}