各位仁兄帮小弟我看看这个代码那边异常

各位仁兄帮我看看这个代码那边错误
public class OrderedAction extends Action {
/*
* Generated Methods
*/
private String ordernumber=null;
private String ordertime=null;
private String paymoney=null;
private String status=null;
Statement stmt=null;
  ResultSet rs=null;
/** 
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws SQLException,IOException
{
PrintWriter out=response.getWriter();
  MyOrderForm myorderForm=(MyOrderForm) form;
  Db db=new Db();
  ArrayList<MyOrderForm> arr=new ArrayList<MyOrderForm>();
  ordernumber=myorderForm.getOrdernumber();
  stmt=db.getStmtread();
  rs=stmt.executeQuery("select * from o_form where order_form_no ="+ordernumber);
  out.println(rs);
  out.println("");
  //ordernumber=rs.getString("order_form_no");
//ordertime=rs.getString("order_form_confirm_time");
//paymoney=rs.getString("sum_pay_money");
//status=rs.getString("order_form_status");
//myorderForm.setOrdernumber(ordernumber);
//myorderForm.setOrdertime(ordertime);
//myorderForm.setPaymoney(paymoney);
//myorderForm.setStatus(status);
//arr.add(myorderForm);
 
 
request.setAttribute("msg",arr);
  //return mapping.findForward("success");
return null;
}
}
界面就是显示不出东西，那个大侠能帮下忙

------解决方案--------------------
返回null了啊