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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.xml.sax;

import java.util.ResourceBundle;
import java.text.MessageFormat;
import java.io.PrintWriter;
import java.io.Writer;
import java.io.OutputStream;
import java.io.FileNotFoundException;

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXException;
import com.thaiopensource.util.UriOrFile;

public class ErrorHandlerImpl implements ErrorHandler {
  private final PrintWriter err;
  
  private final String bundleName
    = "com.thaiopensource.xml.sax.resources.Messages";

  private ResourceBundle bundle = null;

  public ErrorHandlerImpl() {
    this(System.err);
  }

  public ErrorHandlerImpl(OutputStream os) {
    this.err = new PrintWriter(os);
  }

  public ErrorHandlerImpl(Writer w) {
    this.err = new PrintWriter(w);
  }

  public void close() {
    err.close();
  }

  private String getString(String key) {
    if (bundle == null)
      bundle = ResourceBundle.getBundle(bundleName);
    return bundle.getString(key);
  }

  private String format(String key, Object[] args) {
    return MessageFormat.format(getString(key), args);
  }

  public void warning(SAXParseException e) throws SAXParseException {
    print(format("warning",
		 new Object[] { formatMessage(e), formatLocation(e) }));
  }

  public void error(SAXParseException e) {
    print(format("error",
		 new Object[] { formatMessage(e), formatLocation(e) }));
  }

  public void fatalError(SAXParseException e) throws SAXParseException {
    throw e;
  }

  public void printException(Throwable e) {
    String loc;
    if (e instanceof SAXParseException)
      loc = formatLocation((SAXParseException)e);
    else
      loc = "";
    String message;
    if (e instanceof SAXException)
      message = formatMessage((SAXException)e);
    else
      message = formatMessage(e);
    print(format("fatal", new Object[] { message, loc }));
  }

  public void print(String message) {
    if (message.length() != 0) {
      err.println(message);
      err.flush();
    }
  }

  private String formatLocation(SAXParseException e) {
    String systemId = e.getSystemId();
    int n = e.getLineNumber();
    Integer lineNumber = n >= 0 ? new Integer(n) : null;
    n = e.getColumnNumber();
    Integer columnNumber = n >= 0 ? new Integer(n) : null;
    if (systemId != null) {
      systemId = UriOrFile.uriToUriOrFile(systemId);
      if (lineNumber != null) {
	if (columnNumber != null)
	  return format("locator_system_id_line_number_column_number",
			new Object[] { systemId, lineNumber, columnNumber });
	else
	  return format("locator_system_id_line_number",
			new Object[] { systemId, lineNumber });
      }
      else
	return format("locator_system_id",
		      new Object[] { systemId });
    }
    else if (lineNumber != null) {
      if (columnNumber != null)
	return format("locator_line_number_column_number",
		      new Object[] { lineNumber, columnNumber });
      else
	return format("locator_line_number",
		      new Object[] { lineNumber });
    }
    else
      return "";
  }

  private String formatMessage(SAXException se) {
    Exception e = se.getException();
    String detail = se.getMessage();
    if (e != null) {
      String detail2 = e.getMessage();
      // Crimson stupidity
      if (detail2 == detail || e.getClass().getName().equals(detail))
	return formatMessage(e);
      else if (detail2 == null)
	return format("exception",
		      new Object[]{ e.getClass().getName(), detail });
      else
	return format("tunnel_exception",
		      new Object[] { e.getClass().getName(),
				     detail,
				     detail2 });
    }
    else {
      if (detail == null)
	detail = getString("no_detail");
      return detail;
    }
  }

  private String formatMessage(Throwable e) {
    String detail = e.getMessage();
    if (detail == null)
      detail = getString("no_detail");
    if (e instanceof FileNotFoundException)
      return format("file_not_found", new Object[] { detail });
    return format("exception",
		  new Object[] { e.getClass().getName(), detail });
  }
}