in my application a servlet stores the user's details when she starts
with the application as follows
User user=new User();
HttpSession session=req.getSession();
user.setUser(userName);
user.setRole("user");
session.setAttribute("user", user);
RequestDispatcher rd=req.getRequestDispatcher("/HomePage.jsp");
rd.forward(req, resp);
After this servlet stored the User object in session, every jsp in the
application receives the User object from session using a helper class
public class UserIdentifier
{
public static String getUser(HttpServletRequest req)
{
HttpSession session=req.getSession(false);
User userObj=(User)session.getAttribute("user");
String role=userObj.getRole(); // HERE IS THE ERROR
String user=null;
if(role.equals("admin"))
{
user=(String)session.getAttribute("user2");
if(user==null)
{
return null;
}
}
if(role.equals("user"))
{
user=userObj.getUser();
}
return user;
}
}
The User class is serializable and <sessions-enabled>true</sessions-
enabled> is present in appengine-web.xml
it works fine on my local machine but when i deployed to app engine,
it throws a nullpointer exception on the line where i called
userObj.getRole();
it indicates that userObj is null, i dont understand why it is not
able to pick the User object from the session
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