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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.impl;

import java.util.Collection;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.Container;
import org.directwebremoting.extend.InitializingBean;
import org.directwebremoting.util.LocalUtil;

/**
 * An implementation of some of the simpler methods from {@link Container}
 * This class has nothing whatsoever to do with
 * {@link org.directwebremoting.extend.ContainerAbstraction}.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public abstract class AbstractContainer implements Container
{
    /**
     * Used after setup to call {@link InitializingBean#afterContainerSetup(Container)}
     * on all the contained beans.
     */
    protected void callInitializingBeans()
    {
        callInitializingBeans(getBeanNames());
    }

    /**
     * Call {@link InitializingBean#afterContainerSetup(Container)} on the named
     * beans
     * @param beanNames The beans to setup.
     */
    protected void callInitializingBeans(Collection beanNames)
    {
        for (String name : beanNames)
        {
            Object bean = getBean(name);
            if (bean instanceof InitializingBean)
            {
                InitializingBean startMeUp = (InitializingBean) bean;
                startMeUp.afterContainerSetup(this);
            }
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Container#getBean(java.lang.Class)
     */
    public  T getBean(Class type)
    {
        Object bean = getBean(LocalUtil.originalDwrClassName(type.getName()));
        try
        {
            return type.cast(bean);
        }
        catch (ClassCastException ex)
        {
            log.error("ClassCastException: Asked for implementation of " + type.getName() + " but the container has a type " + bean.getClass().getName());
            log.error("  - calling toString() on returned bean gives: " + bean);
            throw ex;
        }
    }

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