dwr和ssh集成之后报异常:nullpointer

dwr和ssh集成之后报异常:nullpointer,但是main方法中可以测试到数据，也就是hibernate没有配错，而且dwr测试一些简单的未连接数据库的数据时，也可以查到手写的数据，我想是不是web.xml配置错了啊。
web.xml配置信息:<?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">
  <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:beans.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>

<!-- dwr的配置 -->
    <servlet>  
        <servlet-name>dwr</servlet-name>  
        <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>  
        <!--此处指定项目处于开发之中，故可通过http://localhost:8000/dwrdemo1/dwr/，而不会出现403 -->   
        <init-param>  
            <param-name>debug</param-name>  
            <param-value>true</param-value>  
        </init-param>  
        <init-param>  
            <param-name>crossDomainSessionSecurity</param-name>  
            <param-value>false</param-value>  
        </init-param>  
        <!-- dwr产生failed to read input的解决方法 -->  
        <init-param>  
            <param-name>classes</param-name>  
            <param-value>java.lang.Object</param-value>  
        </init-param>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>dwr</servlet-name>  
        <url-pattern>/dwr/*</url-pattern>  
    </servlet-mapping> 
<!-- end -->
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>