关于使用Logic：iterate标签来显示数据库表内容的问题,基于struts框架

使用Logic:iterate标签后，页面能显示。但是数据没有，上一个帖子发了之后又一些收获。但是还是有错，今天修改了下。还有错：javax.servlet.jsp.JspException: Cannot find bean: "userlist" in scope: "request"代码如下：
ListUserActionForm的代码
public class ListUserActionForm extends ActionForm{
    private String userid;
    private String userpwd;
    private int id;
    /**
     * @return the userid
     */
    public String getUserid() {
        return userid;
    }    /**
     * @param userid the userid to set
     */
    public void setUserid(String userid) {
        this.userid = userid;
    }    /**
     * @return the userpwd
     */
    public String getUserpwd() {
        return userpwd;
    }    /**
     * @param userpwd the userpwd to set
     */
    public void setUserpwd(String userpwd) {
        this.userpwd = userpwd;
    }    /**
     * @return the id
     */
    public int getId() {
        return id;
    }    /**
     * @param id the id to set
     */
    public void setId(int id) {
        this.id = id;
    } ListItemsAction的代码：
public ActionForward excute(ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response) throws ClassNotFoundException, SQLException {
        ListUserActionForm luf = (ListUserActionForm) form;
        ArrayList userlist = new ArrayList();
        String sql = "Select id,userid,userpwd from user";
        Connection con = DBHelper.acquireConnection();
        Statement stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            luf.setId(rs.getInt("id"));
            luf.setUserid(rs.getString("userid"));
            luf.setUserpwd(rs.getString("userpwd"));
            userlist.add(luf);
        }
        System.out.println(userlist.size());
        request.setAttribute("list", userlist);        
        return (mapping.findForward("success"));
    }显示列表页面Admin.jsp的代码：
 <table>            
                <tr>
                    <td>ID：</td>
                    <td>用户ID：</td>
                    <td>用户密码：</td>
                </tr>
                <tr>
                    <logic:notEmpty name="list">  
                    <logic:iterate name="list" id="list">
                    <td><bean:write name="list" property="id" filter="true"/></td>
                    <td><bean:write name="list" property="userid" filter="true"/></td>
                    <td><bean:write name="list" property="userpwd" filter="true"/></td>
                    </logic:iterate>
                    </logic:notEmpty>
                </tr>             
        </table>struts-config中的配置：
<action  input="/Admin.jsp" name="listUserActionForm" path="/listItemsAction" scope="request" type="com.myapp.struts.Action.ListItemsAction">
            <forward name="success" path="/listItemsAction"/>
</action>希望有人能帮我找到错误，跪谢。Struts标签Bean