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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 boiler plate code between the web browser and your Java code.

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package org.directwebremoting.dwrp;

import org.directwebremoting.extend.WaitController;
import org.directwebremoting.util.Logger;

/**
 * A {@link WaitController} that works with {@link Object#wait(long)}
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class NotifyWaitController implements WaitController
{
    /**
     * @param lock
     */
    public NotifyWaitController(Object lock)
    {
        this.lock = lock;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.WaitController#shutdown()
     */
    public void shutdown()
    {
        try
        {
            synchronized (lock)
            {
                lock.notifyAll();
            }
        }
        catch (Exception ex)
        {
            log.warn("Failed to notify all ScriptSession users", ex);
        }

        shutdown = true;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.WaitController#isShutdown()
     */
    public boolean isShutdown()
    {
        return shutdown;
    }

    /**
     * The object that is being {@link Object#wait(long)} on so we can
     * move it on with {@link Object#notifyAll()}.
     */
    private Object lock;

    /**
     * The log stream
     */
    private static final Logger log = Logger.getLogger(NotifyWaitController.class);

    /**
     * Has {@link #shutdown()} been called on this object?
     */
    private boolean shutdown = false;
}