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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 2008 the original author or authors.
 *
 * 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.spring;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.util.Assert;
import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;

/**
 * Automatically maps (at context startup) the URLs needed by DWR to a DWRController.
 *
 * @author Jose Noheda [[email protected]]
 */
public class DwrHandlerMapping extends SimpleUrlHandlerMapping {

	private static final Log log = LogFactory.getLog(DwrHandlerMapping.class);

	/**
	 * Maps the following URLs to dwr controller
	 * /engine.js
	 * /util.js
	 * /interface/**
	 * /call/**
	 * /test/**
	 * /download/**
	 */
	@Override
    public void initApplicationContext() throws BeansException {
	    String[] dwrControllerName = getApplicationContext().getBeanNamesForType(DwrController.class);
	    Assert.notEmpty(dwrControllerName, "No DWR Controller bean definition found.");
		Object handler = getApplicationContext().getBean(dwrControllerName[0]);
		Map mappings = new HashMap();
		mappings.put("/engine.js", handler);
		mappings.put("/util.js", handler);
		mappings.put("/interface/**", handler);
		mappings.put("/call/**", handler);
		mappings.put("/test/**", handler);
		mappings.put("/download/**", handler);
		mappings.put("/jsonp/**", handler);
		mappings.put("/jsonrpc/**", handler);
		mappings.put("/data/Store.js", handler);
		if (log.isDebugEnabled())
		{
			log.info("[engine.js] mapped to dwrController");
			log.info("[util.js] mapped to dwrController");
			log.info("Interface beans and calls (/interface/*, /call/*) mapped to dwrController");
			log.info("/test/* has been mapped to dwrController");
			log.info("/download/* has been mapped to dwrController");
		}
		setUrlMap(mappings);
		super.initApplicationContext();
	}

}