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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.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.directwebremoting.extend.DebugPageGenerator;
import org.directwebremoting.extend.Handler;
import org.directwebremoting.util.LocalUtil;
import org.directwebremoting.util.MimeConstants;

/**
 * A handler for requests to create a class debug page
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class TestHandler implements Handler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException
    {
        String scriptName = request.getPathInfo();
        scriptName = scriptName.replace(testHandlerUrl, "");
        while(scriptName.endsWith("/"))
        {
            scriptName = scriptName.substring(0, scriptName.length() - 1);
        }
        if (!LocalUtil.isValidScriptName(scriptName))
        {
            throw new SecurityException("Illegal script name.");
        }

        String page = debugPageGenerator.generateTestPage(request.getContextPath() + request.getServletPath(), scriptName);

        response.setContentType(MimeConstants.MIME_HTML);
        PrintWriter out = response.getWriter();
        out.print(page);
    }

    /**
     * Setter for the debug page generator
     * @param debugPageGenerator The new debug page generator
     */
    public void setDebugPageGenerator(DebugPageGenerator debugPageGenerator)
    {
        this.debugPageGenerator = debugPageGenerator;
    }

    /**
     * The bean to handle debug page requests
     */
    protected DebugPageGenerator debugPageGenerator = null;

    /**
     * Setter for the URL that this handler available on
     * @param testHandlerUrl the testHandlerUrl to set
     */
    public void setTestHandlerUrl(String testHandlerUrl)
    {
        this.testHandlerUrl = testHandlerUrl;
    }

    /**
     * What URL is this handler available on?
     */
    protected String testHandlerUrl;
}