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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 org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;

/**
 * Adds the missing elements to the DWR namespace handling. Namely 
 *
 * @author Jose Noheda [[email protected]]
 */
public class DwrAnnotationNamespaceHandler extends DwrNamespaceHandler
{

    /** 
     * Add a new Parser to register  
     *
     * @see org.directwebremoting.spring.DwrNamespaceHandler#init()
     */
    @Override
    public void init()
    {
        super.init();
        registerBeanDefinitionParser("annotation-config", new AnnotationConfigBeanDefinitionParser());
    }

    /**
     * Register a new bean definition for each Spring bean that is annotated with 
     * {@link org.directwebremoting.annotations.RemoteProxy}.
     *
     * @author Jose Noheda [[email protected]]
     */
    protected class AnnotationConfigBeanDefinitionParser implements BeanDefinitionParser
    {

        /**
         * Creates a post-processor that will scan the context for candidate beans.
         *
         * @param element 
         * @param parserContext a reference to the bean registry
         */
        public BeanDefinition parse(Element element, ParserContext parserContext) {
            BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(DwrAnnotationPostProcessor.class);
            parserContext.getRegistry().registerBeanDefinition("dwrAnnotationPostProcessor", builder.getBeanDefinition());
            return parserContext.getRegistry().getBeanDefinition("dwrAnnotationPostProcessor");
        }

    }

}