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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.Constructor;

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;
import org.directwebremoting.util.JavascriptUtil;

/**
 * An implementation of Converter for anything with a string constructor.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ConstructorConverter extends AbstractConverter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable data)
    {
        if (data.isNull())
        {
            return null;
        }

        try
        {
            Constructor converter = paramType.getConstructor(String.class);
            return converter.newInstance(data.getValue());
        }
        catch (Exception ex)
        {
            throw new IllegalArgumentException(ex.toString());
        }
    }

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