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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.extend;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.ConversionException;

/**
 * A Property for when we've been given override information in a signatures
 * element.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class OverrideProperty implements Property
{
    /**
     * All OverrideProperties need a name and the type they are providing
     */
    public OverrideProperty(Class propertyType)
    {
        this.propertyType = propertyType;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#createChild(int)
     */
    public Property createChild(int index)
    {
        return new NestedProperty(this, null, null, 0, index);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getName()
     */
    public String getName()
    {
        return "OverrideProperty";
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getPropertyType()
     */
    public Class getPropertyType()
    {
        return propertyType;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws ConversionException
    {
        log.error("Attempt to getValue() on Override Property.");
        return null;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#setValue(java.lang.Object, java.lang.Object)
     */
    public void setValue(Object bean, Object value) throws ConversionException
    {
        log.error("Attempt to setValue() on Override Property.");
    }

    /**
     * @see org.directwebremoting.extend.Property#getName()
     */
    private final Class propertyType;

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