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Source code below from: Java In A Nutshell, 5th Edition By David Flanagan Published 15 March, 2005 Average rating       Powells     Alibris

import javax.xml.XMLConstants;
import javax.xml.validation.*;
import javax.xml.transform.sax.SAXSource;
import org.xml.sax.*;
import java.io.*;

public class Validate {
    public static void main(String[] args) throws IOException {
    File documentFile = new File(args[0]);  // 1st arg is document
    File schemaFile = new File(args[1]);    // 2nd arg is schema 

    // Get a parser to parse W3C schemas.  Note use of javax.xml package
    // This package contains just one class of constants.
    SchemaFactory factory =
        SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    
    // Now parse the schema file to create a Schema object
    Schema schema = null;
    try { schema = factory.newSchema(schemaFile); }
    catch(SAXException e) { fail(e); }

    // Get a Validator object from the Schema.
    Validator validator = schema.newValidator();

    // Get a SAXSource object for the document
    // We could use a DOMSource here as well
    SAXSource source =
        new SAXSource(new InputSource(new FileReader(documentFile)));
    
    // Now validate the document
    try { validator.validate(source); }
    catch(SAXException e) { fail(e); }

    System.err.println("Document is valid");
    }

    static void fail(SAXException e) {
    if (e instanceof SAXParseException) {
        SAXParseException spe = (SAXParseException) e;
        System.err.printf("%s:%d:%d: %s%n",
                  spe.getSystemId(), spe.getLineNumber(),
                  spe.getColumnNumber(), spe.getMessage());
    }
    else {
        System.err.println(e.getMessage());
    }
    System.exit(1);
    }
}