sp.printHTMLheader("RUBiS ERROR: SellItemForm");
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException  {    String  categoryId=null, userId=null;    Context initialContext = null;    sp = new ServletPrinter(response, "SellItemForm");    sp.printHTMLheader("RUBiS: Sell your item");    try    {      initialContext = new InitialContext();    }     catch (Exception e)     {      sp.printHTML("Cannot get initial context for JNDI: " +e+"<br>");      sp.printHTMLfooter();      return ;    }    categoryId = request.getParameter("category");    userId = request.getParameter("user");    if ((categoryId == null) || categoryId.equals("") || (userId == null) || userId.equals(""))    {      sp.printHTMLheader("RUBiS ERROR: SellItemForm");      sp.printHTML("No category or user identifier received - Cannot process the request<br>");      sp.printHTMLfooter();      return ;    }        sp.printFile(Config.HTMLFilesPath+"/sellItemForm.html");    sp.printHTML("<input type=hidden name=\"userId\" value=\""+userId+"\"> ");    sp.printHTML("<input type=hidden name=\"categoryId\" value=\""+categoryId+"\"> ");    sp.printHTMLfooter();  }