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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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * A default implementation of ServerLoadMonitor
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PollingServerLoadMonitor extends AbstractServerLoadMonitor
{
    /* (non-Javadoc)
     * @see org.directwebremoting.extend.ServerLoadMonitor#supportsStreaming()
     */
    public boolean supportsStreaming()
    {
        return false;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.ServerLoadMonitor#getMaxConnectedTime()
     */
    public long getConnectedTime()
    {
        return 0;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerLoadMonitor#timeToNextPoll()
     */
    public int getDisconnectedTime()
    {
        return disconnectedTime;
    }

    /**
     * Accessor for the disconnected time.
     * @param disconnectedTime How long should clients spend disconnected
     * @deprecated Use {@link #setDisconnectedTime(int)} instead
     */
    @Deprecated
    public void setTimeToNextPoll(int disconnectedTime)
    {
        log.warn("timeToNextPoll is deprecated. Please use disconnectedTime");
        setDisconnectedTime(disconnectedTime);
    }

    /**
     * Accessor for the disconnected time.
     * @param disconnectedTime How long should clients spend disconnected
     */
    public void setDisconnectedTime(int disconnectedTime)
    {
        if (disconnectedTime < 500)
        {
            log.warn("Small values of disconnectedTime could heavy server load. Using disconnectedTime=500");
            disconnectedTime = 500;
        }

        this.disconnectedTime = disconnectedTime;
    }

    /**
     * How long are we telling users to wait before they come back next
     */
    protected int disconnectedTime = 500;

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