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protected void doPost(HttpServletRequest request,
  HttpServletResponse response) {
  
  // validate input (omitted)
  String username = request.getParameter("username");
  char[] password = request.getParameter("password").toCharArray();
  boolean rememberMe = Boolean.valueOf(request.getParameter("rememberme"));
  LoginService loginService = new LoginServiceImpl();
    boolean validated = false;
    if (rememberMe) {
      if (request.getCookies()[0] != null
          && request.getCookies()[0].getValue() != null) {
                             
        String[] value = request.getCookies()[0].getValue().split(";");

		             
        if(value.length != 2) {
          // set error and return
        }

	             
         ifif (!loginService.mappingExists(value[0], value[1])) { // (username, random)
          // set error and return
        }
      } else {
        validated = loginService.isUserValid(username, password);
            
           
        if (!validated) {
             // set error and return
          }
        }
        
     String newRandom = loginService.getRandomString();
     // reset the random every time
     loginService.mapUserForRememberMe(username, newRandom);
     HttpSession session = request.getSession();
     session.invalidate();
     session = request.getSession(true);
     // Set session timeout to one hour
     session.setMaxInactiveInterval(60 * 60);
     // Store user attribute and a random attribute in session scope
     session.setAttribute("user", loginService.getUsername());
     Cookie loginCookie = new Cookie("rememberme", username + ";"
                                      + newRandom);
     response.addCookie(loginCookie);
     // ... forward to welcome page
   } else {
     // ...authenticate using isUserValid() and if failed, set error
   }
    Arrays.fill(password, ' ');
}