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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.convert;

import java.lang.reflect.Method;

import org.directwebremoting.ConversionException;
import org.directwebremoting.extend.AbstractConverter;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;

/**
 * Converter for Enums
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class EnumConverter extends AbstractConverter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Converter#convertInbound(java.lang.Class, org.directwebremoting.extend.InboundVariable, org.directwebremoting.extend.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable data) throws ConversionException
    {
        if (data.isNull())
        {
            return null;
        }

        String value = data.urlDecode();

        try
        {
            Method getter = paramType.getMethod("valueOf", String.class);
            Object reply = getter.invoke(paramType, value);
            if (reply == null)
            {
                throw new ConversionException(paramType);
            }
            return reply;
        }
        catch (NoSuchMethodException ex)
        {
            // We would like to have done: if (!paramType.isEnum())
            // But this catch block has the same effect
            throw new ConversionException(paramType);
        }
        catch (Exception ex)
        {
            throw new ConversionException(paramType, ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Converter#convertOutbound(java.lang.Object, org.directwebremoting.extend.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx)
    {
        return new NonNestedOutboundVariable('"' + ((Enum) data).name() + '"');
    }
}