dwr 反推 ScriptSessionListener 不起作用？

[javaersummer]

框架：struts22+ spring+ mybatis + dwr
tomcat启动时初始化了dwr ScriptSessionManager监听器，在登陆时把用户id放入session中后ScriptSessionManager 没有监听，大神帮我看下!
web.xml 配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<welcome-file-list>
		<welcome-file>jsp/frame/index.jsp</welcome-file>
	</welcome-file-list>
	<!-- Spring的监听器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<!-- dwr test -->
	<servlet>
	    <servlet-name>dwr-invoker</servlet-name>
	    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
	    <init-param>
	    <!-- 开启后将可以在浏览器里输入  (http://localhost:8080/dwrdemo/dwr)来查看可用自动生成的js -->
	      <param-name>debug</param-name>
	      <param-value>true</param-value>
	    </init-param>
	    <init-param>
	      <param-name>activeReverseAjaxEnabled</param-name>
	      <param-value>true</param-value>
	    </init-param>
	    <init-param>
	      <param-name>crossDomainSessionSecurity</param-name>
	      <param-value>false</param-value>
	    </init-param>
	    <init-param>
	      <param-name>allowScriptTagRemoting</param-name>
	      <param-value>true</param-value>
	    </init-param>
	    <!-- 这里设定1是为了让DwrServlet 在  InitServlet之前启动，不然无法初始化InitServlet中的监听器-->
	    <load-on-startup>1</load-on-startup>
  	</servlet>
  <servlet-mapping>
    <servlet-name>dwr-invoker</servlet-name>
    <url-pattern>/dwr/*</url-pattern>
  </servlet-mapping>
  <!-- 
	  <servlet>
	    <servlet-name>DWRTestServlet</servlet-name>
	    <servlet-class>dwr.TestServlet</servlet-class>
	  </servlet>
	   <servlet-mapping>
	    <servlet-name>DWRTestServlet</servlet-name>
	    <url-pattern>/DWRTestServlet</url-pattern>
	  </servlet-mapping>
   -->
   
   <!-- Struts2的系统过滤器 -->
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
  <!-- 启动一个dwr scriptsession的监听器，用于监听scriptsession的创建和销毁-->
  <servlet>
    <servlet-name>InitServlet</servlet-name>
    <servlet-class>com.test.InitServlet</servlet-class>
    <load-on-startup>100</load-on-startup>
  </servlet>
   <servlet-mapping>
    <servlet-name>InitServlet</servlet-name>
    <url-pattern>/InitServlet</url-pattern>
  </servlet-mapping>
</web-app>

web.xml 中监听器 scriptsession InitServlet的代码

package com.test;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpSession;

import org.directwebremoting.Container;
import org.directwebremoting.ServerContextFactory;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.event.ScriptSessionEvent;
import org.directwebremoting.event.ScriptSessionListener;
import org.directwebremoting.extend.ScriptSessionManager;
import org.directwebremoting.servlet.DwrServlet;


/**
 * 当启动tomcat时候启动该servlet容器
 */
public class InitServlet extends DwrServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public InitServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	@Override
	public void init() throws ServletException {
		initDWRListener();
	}

	/**
	 * 初始化dwr监听器，用于将用户id与dwr的session进行绑定
	 */
	public void initDWRListener() {
		System.out.println("init DWR Listener success");
        Container container = ServerContextFactory.get().getContainer();
        ScriptSessionManager manager = container.getBean(ScriptSessionManager.class);
        ScriptSessionListener listener = new ScriptSessionListener() {
            public void sessionCreated(ScriptSessionEvent ev) {
                HttpSession session = WebContextFactory.get().getSession();
                String user =  (String) session.getAttribute("username");
                ev.getSession().removeAttribute("username");
                ev.getSession().setAttribute("username", user);
                //TaskPush.sessionManager.put(session, ev.getSession());
                 System.out.println("a scriptsession create------------------------------------------------------------------------,"
                 + user);  //打印没有效果
                
            }
            
            public void sessionDestroyed(ScriptSessionEvent ev) {
            }
        };
        manager.addScriptSessionListener(listener);
    }
}

登陆时验证成功后在session中放入userid

response.getWriter().print("1");
				Map session = ActionContext.getContext().getSession();  
				session.put("username",username);  
				ServletActionContext.getRequest().getSession().setAttribute("username", username) ;
				System.out.println(ServletActionContext.getRequest().getSession().getAttribute("username"));

放入后没有监控到session的变化，求大神帮忙看下，不胜感激！！！