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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.impl;

import java.util.concurrent.ScheduledThreadPoolExecutor;

import jakarta.servlet.ServletContextListener;

import org.directwebremoting.extend.UninitializingBean;

/**
 * Just a standard ScheduledThreadPoolExecutor with a single default thread in
 * the pool (we're not doing heavy scheduling) that is also a
 * {@link ServletContextListener} so the {@link org.directwebremoting.Container}
 * can shut us down.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class AutoShutdownScheduledThreadPoolExecutor extends ScheduledThreadPoolExecutor implements UninitializingBean
{
    /**
     * This is generally used as an event timer, so we don't need more than one
     * thread running at a time.
     */
    public AutoShutdownScheduledThreadPoolExecutor()
    {
        super(1, new DaemonThreadFactory());
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.UninitializingBean#destroy()
     */
    public void destroy()
    {
        this.shutdownNow();
    }
}