[DWR] Tutoriel en erreur

Salut,
J'essaie de suivre ce tuto :[ame="http://www.youtube.com/watch?v=Lby37c2tSZY&feature=related"]AJAX Tutorial - using the dwr framework (2/2) - YouTube[/ame].
Mais je n'ai pas de résultats concluant.
J'ai un problème de converter...

Si quelqu'un maîtrise dwr, je suis preneur.
Merci, voici mes fichiers.

web.xml

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<display-name>dwrDemo</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
 
	<!-- config dwr deb -->
	<servlet>
		<display-name>DWR Servlet</display-name>
		<servlet-name>dwr-invoker</servlet-name>
		<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
		<init-param>
			<param-name>debug</param-name>
			<param-value>true</param-value>
		</init-param>
	</servlet>
 
	<servlet-mapping>
		<servlet-name>dwr-invoker</servlet-name>
		<url-pattern>/dwr/*</url-pattern>
	</servlet-mapping>
 
</web-app>

dwr.xml

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<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"
    "http://getahead.org/dwr/dwr30.dtd">
<!-- The DWR config file defines what classes DWR can create and remote for 
	use by Javascript. In the example above we are defining 2 classes that are 
	remoted and giving the classes names in Javascript. -->
<dwr>
 
	<allow>
		<create creator="new" javascript="Communicator">
			<param name="class" value="com.zaneacademy.Communicator" />
		</create>
		<convert converter="bean" match="com.zaneacademy.*"/>
	</allow>
 
 
</dwr>

la classe java

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package com.zaneacademy;
 
public class Communicator {
 
	public String doCommunicate(String messageFromBrowser){
		System.out.println("message from browser: " + messageFromBrowser);
 
		return "In reply to your message \"" + messageFromBrowser + "\": hi from server";
	}
}

la jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!--  lien du tuto :  http://www.youtube.com/watch?v=Lby37c2tSZY&feature=related  -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title> dwr Demo </title>
	<script type='text/javascript' src='dwr/engine.js'></script>
  <script type='text/javascript' src='dwr/interface/Communicator.js'></script>
  <script type='text/javascript' src='dwr/util.js'></script>
	<script type="text/javascript">
		function communicateWithServer(){
			message-$('messageToBackend').value;
			Communicator.doCommunicate(message, function(data){
				$('messageFromBackend').value-data;
			});
		};
		function clearDisplay(){
			$('messageToBackend').value-""; $('messageFromBackend').value-"";
		};
	</script>
</head>
<body>
	<br/>Communication between Frontend (Javascript Code) and Backend (Java Code): <br/>
	Message To Backend: <input id='messageToBackend' type="text" style="width: 40%;">
	<button id='communicateWithBackend' onclick="communicateWithServer();"> Communicate With Backend</button>
	<br/>Reply From Backend:
	<input id='messageFromBackend' type="text" style="background:lightyellow;width: 40%;" readonly="readonly">
	<button id='clear' onclick="clearDisplay();"> Clear</button>
 
</body>
</html>

En lib, j'ai ajouté au build path
dwr.jar
et commons-logging