Help in session...

[Joey A]

Hi all, I'm having some problems using 'session' in my JSP's. Please let me know if anyone of you could help in this code:   From the first page, I'm passing these values to the second page:   <INPUT type="Hidden" maxlength="10" name="total_inc" size="10"> <INPUT type="Hidden" maxlength="10" name="total_exp" size="10">        <INPUT type="Hidden" maxlength="10" name="net_savings" size="10">   In second page, I'm trying to assign them to new intergers like: <%   int iTotalIncome=Integer.valueOf(request.getParameter("total_inc")).intValue(); int iTotalExpenses=Integer.valueOf(request.getParameter("total_exp")).intValue(); int iNetSavings=Integer.valueOf(request.getParameter("net_savings")).intValue(); %>   And then put them in session:   <% session.putValue("total_inc",new Integer(iTotalIncome)); session.putValue("total_exp",new Integer(iTotalExpenses)); session.putValue("net_savings",new Integer(iNetSavings)); %>   Finally to access them anywhere:   <%out.print(session.getValue("total_inc"));%> <%out.print(session.getValue("total_exp"));%> <%out.print(session.getValue("net_savings"));%>   I'm getting the followint error: java.lang.NumberFormatException: null  at java.lang.Integer.parseInt(Compiled Code)  at jrun__trial__cashflow__Jo_result2ejsp1d._jspService(jrun__trial__cashflow__Jo_result2ejsp1d.java:49)  at allaire.jrun.jsp.HttpJSPServlet.service(Compiled Code)  at allaire.jrun.jsp.JSPServlet.service(Compiled Code)  at allaire.jrun.jsp.JSPServlet.service(Compiled Code)  at allaire.jrun.servlet.JRunSE.service(Compiled Code)  at allaire.jrun.session.JRunSessionService.service(Compiled Code)  at allaire.jrun.servlet.JRunSE.runServlet(Compiled Code)  at allaire.jrun.servlet.JRunRequestDispatcher.forward(Compiled Code)  at allaire.jrun.servlet.JRunSE.service(Compiled Code)  at allaire.jrun.servlet.JRunSE.service(Compiled Code)  at allaire.jrun.servlet.JvmContext.dispatch(Compiled Code)  at allaire.jrun.jrpp.ProxyEndpoint.run(Compiled Code)  at allaire.jrun.ThreadPool.run(Compiled Code)  at allaire.jrun.WorkerThread.run(Compiled Code)   Can anyone point out the error? Thanx, Joey