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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.json.serialize.local;

import java.io.IOException;
import java.io.Writer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.ConversionException;
import org.directwebremoting.ScriptBuffer;
import org.directwebremoting.extend.ConverterManager;
import org.directwebremoting.extend.ScriptBufferUtil;
import org.directwebremoting.json.serialize.JsonSerializer;

/**
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class LocalJsonSerializer implements JsonSerializer
{
    /* (non-Javadoc)
     * @see org.directwebremoting.json.serialize.JsonSerializer#toJson(java.lang.Object, java.io.PrintWriter)
     */
    public void toJson(Object data, Writer out) throws IOException
    {
        // Get the output stream and setup the mime type
        try
        {
            ScriptBuffer buffer = new ScriptBuffer();
            buffer.appendData(data);

            String output = ScriptBufferUtil.createOutput(buffer, converterManager, true);
            out.write(output);
        }
        catch (ConversionException ex)
        {
            log.warn("--ConversionException: class=" + ex.getConversionType().getName(), ex);

            ScriptBuffer buffer = new ScriptBuffer();
            buffer.appendData(ex);

            try
            {
                String output = ScriptBufferUtil.createOutput(buffer, converterManager, true);
                out.write(output);
            }
            catch (ConversionException ex1)
            {
                log.error("--Nested ConversionException: Is there an exception handler registered? class=" + ex.getConversionType().getName(), ex);
            }
        }
    }

    /**
     * Accessor for the DefaultConverterManager that we configure
     * @param converterManager The new DefaultConverterManager
     */
    public void setConverterManager(ConverterManager converterManager)
    {
        this.converterManager = converterManager;
    }

    /**
     * How we convert parameters
     */
    protected ConverterManager converterManager = null;

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