我的第一个dwr，出错了。

今天第一次用dwr，却不通。请高手们帮忙查找错误.
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
  <servlet>
   <servlet-name>dwr-invoker</servlet-name>
   <servlet-class>uk.ltd.getahead.dwr.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
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 
3.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd"><dwr>
<allow>
<convert match="org.proxy.*" converter="bean"></convert>
<create javascript="Proxy" creator="new">
<param name="class" value="com.ditan.proxy.Proxy"></param>
</create>
</allow>
</dwr>
jsp页面<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'custmereg.jsp' starting page</title>
    <script type="text/javascript" src="/dwr/interface/Proxy.js"></script>
    <script type="text/javascript" src="/dwr/engine.js"></script>
    <script type="text/javascript" src="/dwr/util.js"></script>
    <script type="text/javascript" src=/js/common.js></script>
    <script type="text/javascript">
     function init(){
    
     }
    
     function confirm(){
    
     id = document.getElementById("userName");
     alert("succsess!");
Proxy.action("com.ditan.action.custmoer.UserNameConfirmAction","userName",id,list,confirmByBack);
    
    
     }
    
     function confirmByBack(){
     alert("succsess!");
     }
    </script>
    
  </head>
  
  <body onload="init();">
    <div>
     <div>
     <form action="" name="costmeradd">
     <input id="userName" type="text" onblur="confirm();"/>
     </form>
     </div>
    </div>
  </body>
</html>java代码：
package com.ditan.proxy;import java.util.List;public class Proxy {

public ResultDate action(String serviceName,String pName,String pValue,List list){



ResultDate resultdate = null;
//
// try {
// Object obj = Class.forName(serviceName);
//
// ProxyService t = (ProxyService)obj;
//
// resultdate = t.service(serviceName,pName,pValue,list);
//
// } catch (Exception e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
// //ProxyService t = ;
return resultdate;
}}
问题是调不到java代码，