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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.convert;

import java.lang.reflect.InvocationTargetException;
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;

/**
 * Used by {@link XmlBeanConverter}.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 * @author Matthew Young [matthew dot young at forsakringskassan dot se]
 */
public class StringEnumAbstractBaseConverter 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("forString", String.class);
            Object bean = getter.invoke(paramType, value);

            if (bean == null)
            {
                throw new ConversionException(paramType, "unknown enum value (" + value + ")");
            }

            return bean;
        }
        catch (NoSuchMethodException e)
        {
            throw new ConversionException(paramType, e);
        }
        catch (IllegalArgumentException e)
        {
            throw new ConversionException(paramType, e);
        }
        catch (IllegalAccessException e)
        {
            throw new ConversionException(paramType, e);
        }
        catch (InvocationTargetException e)
        {
            throw new ConversionException(paramType, e);
        }
    }

    /* (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('\'' + data.toString() + '\'');
    }
}