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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.util;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

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

/**
 * Mock implementation of the RequestDispatcher interface.
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class FakeRequestDispatcher implements RequestDispatcher
{
    /**
     * Create a new FakeRequestDispatcher for the given URL.
     * @param url the URL to dispatch to.
     */
    public FakeRequestDispatcher(String url)
    {
        this.url = url;
    }

    /* (non-Javadoc)
     * @see javax.servlet.RequestDispatcher#forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     */
    public void forward(ServletRequest request, ServletResponse response)
    {
        if (response.isCommitted())
        {
            throw new IllegalStateException("Cannot perform forward - response is already committed");
        }

        if (!(response instanceof FakeHttpServletResponse))
        {
            throw new IllegalArgumentException("FakeRequestDispatcher requires FakeHttpServletResponse");
        }

        ((FakeHttpServletResponse) response).setForwardedUrl(url);

        if (log.isDebugEnabled())
        {
            log.debug("FakeRequestDispatcher: forwarding to URL [" + url + "]");
        }
    }

    /* (non-Javadoc)
     * @see javax.servlet.RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     */
    public void include(ServletRequest request, ServletResponse response)
    {
        if (!(response instanceof FakeHttpServletResponse))
        {
            throw new IllegalArgumentException("FakeRequestDispatcher requires FakeHttpServletResponse");
        }

        ((FakeHttpServletResponse) response).setIncludedUrl(url);

        if (log.isDebugEnabled())
        {
            log.debug("FakeRequestDispatcher: including URL [" + url + "]");
        }
    }

    private final String url;

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