How to create XML validator from XML schema？

public static void main(String[] args) throws Exception {
// http://www.java-tips.org/java-se-tips-100019/170-javax-xml-validation/1733-how-to-create-xml-validator-from-xml-schema.html try {
// define the type of schema - we use W3C:
String schemaLang = XMLConstants.W3C_XML_SCHEMA_NS_URI;
// get validation driver:
SchemaFactory factory = SchemaFactory.newInstance(schemaLang);
// create schema by reading it from an XSD file:
Schema schema = factory.newSchema(new StreamSource(
"BuildInstall.xsd"));
Validator validator = schema.newValidator();
// at last perform validation:
validator.validate(new StreamSource("Install.xml"));

} catch (SAXException | IOException ex) {
// we are here if the document is not valid:
// ... process validation error...
ex.printStackTrace();
}
}