Updating a table with doPost()

In my doget(), i'm able to see the field values of my table, My purpose is to edit them and then post it back to the database ( updating it). here's a sample of my code In my doPost().
PrintWriter out = res.getWriter();
HttpSession session = req.getSession(true);
String passcode = req.getParameter("passcode");
Member member = new Member("passcode");
member.password = req.getParameter("password");
member.featid = req.getParameter("featid");
member.refid = req.getParameter("refid");
String s = req.getParameter("status");
member.status = Integer.parseInt(s);
......member.update();
Member class does all the updating. But wheni display my fields on the browser and then submit update.Tomcat is giving me runtime error of type:
java.lang.NullPointerException. I'm totally stuck. If you coud give me any suggestion, i would be grateful. Thanks

Hi,
Could you post the stack trace of exception along with the relevant code at which you are getting the exception
I guess one of your variables value is null.
You could just print the values to confirm that your are not getting any null value

Although it is tedious to write all those checks for null values - you will be glad you did. Since getParameter is case sensitive, all it takes is one Password instead of password to cause an error. The NPE should point to a usable line - I'm betting on the Integer.parseInt()
Bill

Hello guys,
Thanks for your input. I checked all of my fields for null and now its working fine!!!..BUT it doesn't update the row in my database. heres my code in doPost() method:
out.println("<TR><TD align = right >");
out.println(" refid: ");
out.println("/TD");
out.println("<TD align = left >");
out.println("<INPUT type=text name=refid value="+member.refid+" >");
out.println("</TD ></TR>");
and then in doget() method:
Member member = new Member("passcode");
member.refid = req.getParameter("refid");
member.update();
Am i doing something wrong???.i have left otu tother fields..Update method basically take all the fields for specific name and then updates the database for that name

Hi Sam,
You need to provide some more information.
You should post the code written for the update() method.That could help us in solving your problem

Hello,
Thanks for replying...I managed to figure out the problem. I really appreciate all of ur help