New to sessions

Question

i need to open a session in first servlet and use its values in the second one... but i cant find really useful sample and .... i did it this way:
////////////////////in first servlet//////////////////////////////////
HttpSession session = req.getSession(true);
String user1 = req.getParameter("name");
session.setAttribute("user", user1);
String pass1 = req.getParameter("pass");
session.setAttribute("pass", pass1);
//////////////////// in second servlet////////////////////////////////
HttpSession session = req.getSession(false);
try{
aa = session.getAttribute("user").toString();
aaa = session.getAttribute("pass").toString();
pw.println("aa"+aa);
pw.println("aaa"+aaa);
catch(Exception e){ pw.println("exception"+ e.getMessage());}
and i get an exception.... in fact i even don t know how second servlet will understand that it have to use the session , was created in the first one....
please can anyone bring me some light on this things... or maybe some links (in fact i ve seen a lot but anyway i can t get it)
please help
thanks

Answer 1

Here is a working example which I have just made.
Let me know me if that works:
**** servlet 1 ****
public class TestServlet1 extends HttpServlet{
     public void doGet(HttpServletRequest req, HttpServletResponse res)
     throws ServletException, IOException {
          HttpSession session = req.getSession(true);
          ServletOutputStream out = res.getOutputStream();
          try  {
               String user1 = "toto";
               session.setAttribute("user", user1);
               out.print("user stored");
          } catch (Exception e)  {
                    out.println("error :"+e.toString());
}*** servlet 2 ***
public class TestServlet2 extends HttpServlet{
     public void doGet(HttpServletRequest req, HttpServletResponse res)
     throws ServletException, IOException {
          HttpSession session = req.getSession(false);
          ServletOutputStream out = res.getOutputStream();
          try  {
               String user1=session.getAttribute("user").toString();
               out.print("user ="+user1);
          } catch (Exception e)  {
                    out.println("error :"+e.toString());
}Regards