SSH整合问题报异常 大虾来看看啊

我写了一个过滤器 然后跳转到action里面从action里面去值 传入页面 出现了异常 我现在把过滤器 struts-config.xml 和 action的代码贴过来 大家看看那里出问题了
过滤器：
 
package com.v516.commn;import java.io.IOException;import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;public class FilterIndex implements javax.servlet.Filter {    public void destroy() {
        // TODO Auto-generated method stub    }    public void doFilter(ServletRequest arg0, ServletResponse arg1,
            FilterChain arg2) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) arg0;
        request.getRequestDispatcher("UserInfoAction.do").forward(arg0, arg1);
        arg2.doFilter(arg0, arg1);
    }    public void init(FilterConfig arg0) throws ServletException {    }}
struts-config.xml代码:
  
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"><struts-config>
    <data-sources />
    <form-beans>
        <form-bean name="userInfoForm"
            type="com.v516.web.form.UserInfoForm" />    </form-beans>    <global-exceptions />
    <global-forwards />
    <action-mappings>
        <action attribute="userInfoForm" input="/userInfo.jsp"
            name="userInfoForm" path="/userInfo" scope="request"
            type="com.v516.web.action.UserInfoAction">
            <forward name="userInfo" path="/userInfo.jsp"></forward>
        </action>action代码：
 
/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.v516.web.action;import java.util.List;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;import com.v516.biz.UserInfoService;
import com.v516.entity.UserInfo;
import com.v516.web.form.UserInfoForm;/**
 * MyEclipse Struts Creation date: 04-22-2010
 * 
 * XDoclet definition:
 * 
 * @struts.action path="/userInfo" name="userInfoForm" input="/userInfo.jsp"
 *                scope="request" validate="true"
 */
public class UserInfoAction extends Action {
    /*
     * Generated Methods
     */
    private UserInfoService service;    public UserInfoService getService() {
        return service;
    }    public void setService(UserInfoService service) {
        this.service = service;
    }    /**
     * Method execute
     * 
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return ActionForward
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {
        List<UserInfo> list = service.queryUserInfo();
        HttpSession session=request.getSession();
        session.setAttribute("list", list);
        return mapping.findForward("userInfo");
    }
 异常如下：2010-4-22 17:56:31 org.apache.jasper.runtime.JspFactoryImpl internalGetPageContext
严重: Exception initializing page context
java.lang.IllegalStateException: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2301)
at org.apache.catalina.connector.Request.getSession(Request.java:2075)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:844)
at org.apache.jasper.runtime.PageContextImpl._initialize(PageContextImpl.java:144)
at org.apache.jasper.runtime.PageContextImpl.initialize(PageContextImpl.java:122)
at org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:107)
at org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:63)
at org.apache.jsp.userInfo_jsp._jspService(userInfo_jsp.java:49)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.v516.commn.FilterIndex.doFilter(FilterIndex.java:23)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)