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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.util;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXParseException;

/**
 * An ErrorHandler that writes to the Log class
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public final class LogErrorHandler implements ErrorHandler
{
    /* (non-Javadoc)
     * @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
     */
    public void fatalError(SAXParseException ex)
    {
        log.fatal(getMessage(ex));
    }

    /* (non-Javadoc)
     * @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
     */
    public void error(SAXParseException ex)
    {
        log.error(getMessage(ex));
    }

    /* (non-Javadoc)
     * @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
     */
    public void warning(SAXParseException ex)
    {
        log.warn(getMessage(ex));
    }

    /**
     * @param ex The exception to create a message from
     * @return A summary of what went wrong.
     */
    private static String getMessage(SAXParseException ex)
    {
        if (ex.getSystemId() != null)
        {
            return "SystemID=" + ex.getSystemId() + " Line=" + ex.getLineNumber() + ' ' + ex.getMessage();
        }

        if (ex.getPublicId() != null)
        {
            return "PublicID=" + ex.getPublicId() + " Line=" + ex.getLineNumber() + ' ' + ex.getMessage();
        }

        return "Line=" + ex.getLineNumber() + ' ' + ex.getMessage();
    }

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(LogErrorHandler.class);
}