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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 2010 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.namespace;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.spring.BeanCreator;
import org.directwebremoting.spring.CreatorConfig;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

/**
 * Creates a proxy for a bean usually defined in another Spring context and referenced
 * using <dwr:proxy-ref />
 *
 * @author Jose Noheda [[email protected]]
 */
public class ProxyParser extends CreatorParserHelper implements BeanDefinitionParser
{

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

    public BeanDefinition parse(Element proxyElement, ParserContext parserContext)
    {
        String beanRef = proxyElement.getAttribute("bean");
        BeanDefinitionRegistry registry = parserContext.getRegistry();
        BeanDefinition beanRefDefinition = findParentDefinition(beanRef, registry);
        String javascript = proxyElement.getAttribute("javascript");
        if (!StringUtils.hasText(javascript))
        {
            javascript = StringUtils.capitalize(beanRef);
            if (log.isDebugEnabled())
            {
                log.debug("No javascript name provided. Remoting using bean id [" + javascript + "]");
            }
            javascript = StringUtils.capitalize(beanRef);
        }
        BeanDefinitionBuilder beanCreator = BeanDefinitionBuilder.rootBeanDefinition(BeanCreator.class);
        beanCreator.addPropertyValue("beanClass", resolveBeanClassname(beanRefDefinition, registry));
        beanCreator.addPropertyValue("beanId", beanRef);
        beanCreator.addDependsOn(beanRef);
        beanCreator.addPropertyValue("javascript", javascript);
        BeanDefinitionBuilder creatorConfig = BeanDefinitionBuilder.rootBeanDefinition(CreatorConfig.class);
        creatorConfig.addPropertyValue("creator", beanCreator.getBeanDefinition());
        configureCreator(registry, javascript, creatorConfig, proxyElement.getChildNodes());
        registerCreator(registry, creatorConfig, javascript);
        return creatorConfig.getBeanDefinition();
    }

}