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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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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.impl;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

import org.directwebremoting.extend.RealScriptSession;
import org.directwebremoting.extend.ScriptConduit;

/**
 * The simplest type of Sleeper that just uses {@link #wait()} and
 * {@link #notify()} to block a thread.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 * @author Mike Wilson
 */
public class ThreadWaitSleeper extends BaseSleeper
{
    public ThreadWaitSleeper(final HttpServletResponse response, final RealScriptSession scriptSession, final ScriptConduit conduit) throws IOException
    {
        super(response, scriptSession, conduit);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.impl.BaseSleeper#enterSleep()
     */
    @Override
    protected void enterSleep()
    {
        while(true) {
            synchronized (lock) {
                while(!awaken && !closed) {
                    try {
                        lock.wait();
                    } catch (InterruptedException ex) {
                        closed = true;
                    }
                }
                if (closed) {
                    break;
                }
                awaken = false;
            }
            doWork();
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.impl.BaseSleeper#wakeUp()
     */
    @Override
    protected void wakeUp()
    {
        synchronized (lock) {
            awaken = true;
            lock.notify();
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.impl.BaseSleeper#close()
     */
    @Override
    protected void close()
    {
        synchronized (lock) {
            closed = true;
            lock.notify();
        }
    }

    // Internal state
    private final Object lock = new Object();
    private boolean awaken = false;
    private boolean closed = false;
}