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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.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.directwebremoting.extend.MarshallException;
import org.directwebremoting.extend.Property;

/**
 * An implementation of {@link Property} that proxies to a {@link PropertyDescriptor}
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PropertyDescriptorProperty implements Property
{
    /**
     * @param descriptor The PropertyDescriptor that we are proxying to
     */
    public PropertyDescriptorProperty(PropertyDescriptor descriptor)
    {
        this.descriptor = descriptor;
    }

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

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

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws MarshallException
    {
        try
        {
            return descriptor.getReadMethod().invoke(bean, new Object[0]);
        }
        catch (InvocationTargetException ex)
        {
            throw new MarshallException(bean.getClass(), ex.getTargetException());
        }
        catch (Exception ex)
        {
            throw new MarshallException(bean.getClass(), ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#setValue(java.lang.Object, java.lang.Object)
     */
    public void setValue(Object bean, Object value) throws MarshallException
    {
        try
        {
            descriptor.getWriteMethod().invoke(bean, new Object[] { value });
        }
        catch (InvocationTargetException ex)
        {
            throw new MarshallException(bean.getClass(), ex.getTargetException());
        }
        catch (Exception ex)
        {
            throw new MarshallException(bean.getClass(), ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getSetter()
     */
    public Method getSetter()
    {
        return descriptor.getWriteMethod();
    }

    /**
     * The PropertyDescriptor that we are proxying to
     */
    protected PropertyDescriptor descriptor;
}