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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.Field;

import org.directwebremoting.ConversionException;

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

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

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

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

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws ConversionException
    {
        try
        {
            return field.get(bean);
        }
        catch (Exception ex)
        {
            throw new ConversionException(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 ConversionException
    {
        try
        {
            field.set(bean, value);
        }
        catch (Exception ex)
        {
            throw new ConversionException(bean.getClass(), ex);
        }
    }

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

    /* (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;
        }

        FieldProperty that = (FieldProperty) obj;

        return this.field.equals(that.field);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        return "FieldProperty[field=" + field.getName() + "]";
    }

    /**
     * The Field that we are proxying to
     */
    private final Field field;
}