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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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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;
import org.directwebremoting.util.JavascriptUtil;
import org.directwebremoting.util.LocalUtil;

/**
 * Converter for all primitive types
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PrimitiveConverter 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) throws ConversionException
    {
        if (data.isNull())
        {
            return null;
        }

        String value = data.getValue().trim();

        try
        {
            return LocalUtil.simpleConvert(value, paramType);
        }
        catch (NumberFormatException ex)
        {
            log.debug("Error converting " + value + " to a number.");
            throw new ConversionException(paramType, "Format error converting number.");
        }
        catch (IllegalArgumentException ex)
        {
            throw new ConversionException(paramType);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx)
    {
        Class paramType = data.getClass();

        if (data.equals(Boolean.TRUE))
        {
            return new NonNestedOutboundVariable("true");
        }
        else if (data.equals(Boolean.FALSE))
        {
            return new NonNestedOutboundVariable("false");
        }
        else if (paramType == Character.class)
        {
            // Treat characters as strings
            return new NonNestedOutboundVariable('\"' + JavascriptUtil.escapeJavaScript(data.toString()) + '\"');
        }
        else
        {
            // We just use the default toString for all numbers
            return new NonNestedOutboundVariable(data.toString());
        }
    }

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(PrimitiveConverter.class);
}