if (request.getParameter("submitLogin") != null)
        {
            this.doLogin(request, response);
        }
        else
        {
            request.getSession().setAttribute("USER", null);
            request.getRequestDispatcher("WEB-INF/login.jsp").forward(request, response);
        }

    }

    private void doLogin(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
    {
        String login = request.getParameter("playerName");
        String password = request.getParameter("password");

        Player user = PlayerRepoMySQL.getInstance().getByPlayername(login);

        if (user == null ||!(PlayerPasswordHashing.hashCompare(password, user.getPassword())))
        {
            System.err.println("Failed to login (no user found or incorrect password.");
            request.getRequestDispatcher("WEB-INF/login.jsp").forward(request, response);
        }
        else
        {
            request.getSession().setAttribute("USER", user);
            request.getRequestDispatcher("index.html").forward(request, response);
        }