@Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // POST method only used for tracked login operation HttpSession session = request.getSession(); response.setContentType("text/plain"); PrintWriter out = response.getWriter(); // Get the username and password from request String username = request.getParameter("id"); String password = request.getParameter("pwd"); Long id = 0L; try { id = Long.parseLong(username); } catch (Exception ex) { } if (username != null && password != null) { // Login into tracked system CTracked ctracked = db.loginTrackedFromMobile(id, password).getResult(); if (ctracked != null) { // Login successful out.print("OK," + ctracked.getUsername()); session.setAttribute("device_id", ctracked.getUsername()); log.info(ctracked + " : logined!"); } } }