Can't retrieve bean from http session!

Hi,

My web application is using Struts with WebSphere 5.1. I have problems getting a Bean from http session. One of the action class creates and inserts a bean to http session and pass the the bean to a jsp page. The jsp page can't get it. The problem I found out so far is that I can't even get the bean in the action class once it's set by setAttribute (There is no problem to create the bean and put the bean into http session). I'd include the code pieces here for clarification.

public class joinStep1Action extends Action {

      public ActionForward execute(
            ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
            throws Exception {

            ActionErrors errors = new ActionErrors();
            ActionForward forward = new ActionForward();
            // return value
            HttpSession session = request.getSession();
            try {

                  UserBean ub = (UserBean) session.getAttribute("userBean");
                  Map pbMap = new TreeMap();
                  if (ub != null) {      
                        PaymentOptionsBean payOptBean = new PaymentOptionsBean(ub, pbMap);
                        if (payOptBean != null)
                        {
                        //session.setAttribute("paymentOptionsBean",
                        //      new PaymentOptionsBean(ub, pbMap));
                        session.setAttribute("paymentOptionsBean", payOptBean);
                        // pbMap is a Map of PricingBeans
                        session.setAttribute("pbMap", pbMap);
                        }
                        else {
                              System.out.println("Error!!! setting paymentOptionsBean!!!");
                        }
                  
                  }

PaymentOptionsBean pb = (PaymentOptionsBean)session.getAttribute("paymentOptionsBean");
System.out.println(pb.toString());  <---- getting java.lang.NullPointerException

            // Write logic determining how the user should be forwarded.
            forward = mapping.findForward("success");
            // Finish with
            return (forward);

      }
}

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