Getting Attriutes from servlet sessions

Question

Hi currently doing a college project and im having problems with sessions, i cant seem to be able to put a value into the session and print it off from a different servlet. The project has a basic login page where the user enters a username and password and if it is verified it sends them to the main page, it is here i want to display the username of the user and on pages following on form this. Below is a sample of my session code.
//Servelt 1HttpSession session = request.getSession(true);
if(username != null)
                              session.setAttribute("username", username);
                                   //     passItOn(request, response, pathtoservlet);
          // Welcome the user into the system
                              out.println("</UL>");
     out.println("</BODY></HTML>");
     out.println("You are logged on as   " + username );
}//Servlet 2HttpSession session = request.getSession();
               //Enumeration enum = session.getAttributeNames();
               if (session.getAttribute(username) != null)      
                    String str= (String) session.getAttribute("username");
                    out.println("Welcome  " + username );
                    }//Please help

Answer 1

if (session.getAttribute(username) != null)...That should be:
String username = (String) session.getAttribute("username");
if (username != null) ...
You're trying to get an attribute named whatever the value of the username variable is, not an attribute named "username".