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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 boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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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;
    }

    public String getName()
    {
        return "NestedProperty";
    }

    public Class getPropertyType()
    {
        return LocalUtil.toClass(parameterType, toString());
    }

    public Object getValue(Object bean) throws ConversionException
    {
        throw new UnsupportedOperationException("Can't get value from nested property");
    }

    public void setValue(Object bean, Object value) throws ConversionException
    {
        throw new UnsupportedOperationException("Can't set value to nested property");
    }

    public Property createChild(int aNewParameterNumber)
    {
        return new NestedProperty(this, object, parameterType, parameterNumber, aNewParameterNumber);
    }

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

    @Override
    public int hashCode()
    {
        return object.hashCode() + parameterNumber;
    }

    @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;
    }

    @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;
}