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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 java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import org.directwebremoting.ConversionException;
import org.directwebremoting.util.LocalUtil;

/**
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class NestedProperty implements Property
{
    /**
     *
     */
    public NestedProperty(Property parent, Object method, Type parentParameterType, int parameterNumber, int newParameterNumber)
    {
        this.parent = parent;

        if (parentParameterType instanceof ParameterizedType)
        {
            ParameterizedType ptype = (ParameterizedType) parentParameterType;
            Type[] actualTypeArguments = ptype.getActualTypeArguments();

            if (newParameterNumber >= actualTypeArguments.length)
            {
                throw new IllegalArgumentException("newParameterNumber=" + newParameterNumber + " is too big when parameterType=" + parentParameterType + " give actualTypeArguments.length=" + actualTypeArguments.length);
            }

            this.parameterType = actualTypeArguments[newParameterNumber];
        }
        else
        {
            this.parameterType = null;
        }

        this.object = method;
        this.parameterNumber = parameterNumber;
        this.newParameterNumber = newParameterNumber;
    }

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

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getPropertyType()
     */
    public Class getPropertyType()
    {
        return LocalUtil.toClass(parameterType, toString());
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws ConversionException
    {
        throw new UnsupportedOperationException("Can't get value from nested property");
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#setValue(java.lang.Object, java.lang.Object)
     */
    public void setValue(Object bean, Object value) throws ConversionException
    {
        throw new UnsupportedOperationException("Can't set value to nested property");
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#createChild(int)
     */
    public Property createChild(int aNewParameterNumber)
    {
        return new NestedProperty(this, object, parameterType, parameterNumber, aNewParameterNumber);
    }

    /**
     * @return The type parameter
     */
    public Type getParameterType()
    {
        return parameterType;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode()
    {
        return object.hashCode() + parameterNumber;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj)
    {
        if (obj == this)
        {
            return true;
        }

        if (obj == null || this.getClass() != obj.getClass())
        {
            return false;
        }

        NestedProperty that = (NestedProperty) obj;

        if (!this.object.equals(that.object))
        {
            return false;
        }

        if (!this.parent.equals(that.parent))
        {
            return false;
        }

        if (this.newParameterNumber != that.newParameterNumber)
        {
            return false;
        }

        return this.parameterNumber == that.parameterNumber;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        if (object instanceof Method)
        {
            Method method = (Method) object;
            return "(method=" + method.toGenericString() + ", parameter: " + parameterNumber + ")";
        }
        else if (object instanceof Constructor)
        {
            Constructor ctor = (Constructor) object;
            return "(method=" + ctor.toGenericString() + ", parameter: " + parameterNumber + ")";
        }

        return "(method=" + object.toString() + ", parameter: " + parameterNumber + ")";
    }

    private final Property parent;

    private final Object object;

    private final int parameterNumber;

    private final Type parameterType;

    private final int newParameterNumber;
}