Displaying an ArrayList of values in JSP

Question

Hi ,
I have a servlet called Submit Servlet that basically gets a EmpID from the request parameter , searches in a LetterRequest Table and sets matching records in an ArrayList of objects
My probelm is sending this ArrayList to a JSP and displaying all the values in each object in a table .
I am getting a[b] NullPointerException .Problem is I dont know if its coming from my servlet or my JSP .
Here is part of the code for my servlet
private void performTask(HttpServletRequest req, HttpServletResponse resp)
     throws ServletException, IOException
          String EmpID=req.getParameter("txtEmpID");
          if(EmpID.equals("")){
               //throw a pop up message saying there is an error
          else
               LetterRequestDAO LtrDAO=new LetterRequestDAO("001");
               LtrDAO.storeLetter(EmpID);     
               LetterList=LtrDAO.getLetterList();
               if(LetterList==null)
                    System.out.println("Your Letter List is null");
               HttpSession session = req.getSession(true);     
               req.setAttribute("LTRList", LetterList);
               session.setAttribute("LtrList",LetterList);
               RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("LetterRequestJSP.jsp");
               try
                    dispatcher.forward(req, resp);
               catch (Exception  e)
                    // TODO Auto-generated catch block
                    System.out.println("In catch block of perform task");
          And this is part of my JSP .
<%
        session=request.getSession();
       ArrayList LetterList = (ArrayList)session.getAttribute("LtrList");
       for (Iterator iter = LetterList.iterator(); iter.hasNext();)
                    LetterRequestDTO LtrDTO = (LetterRequestDTO) iter.next();     
                     out.println("<tr>");     
                     out.println("<td>" + LtrDTO.getLetterID() + "</td>");
                     out.println("<td>" + LtrDTO.getEmpID() + "</td>");
                 out.println("<td>" + LtrDTO.getAddress1() + "</td>");
                 out.println("<td>" + LtrDTO.getAddress2() + "</td>");
                 out.println("<td>" + LtrDTO.getAddress3() + "</td>");
                 out.println("</tr>");
          %>What am I doing wrong ? Is it something like I cant get values from a class into a JSP or something ??

Answer 1

Just a simple mistake I believe....
modify ur Line of Code
HttpSession session = req.getSession(true);
as
HttpSession session = req.getSession(false);
true variable if u pass...it creates a new session, and it will not bind ur arraylist to the existing session.
Hope this helps !!