@Override public void post(HttpServletRequest request) { String nickName = request.getParameter("nickName"); String password = request.getParameter("password"); if (nickName != null && nickName.length() > 0) { Member member = dao.login(nickName, password); if (member != null) { request.getSession().setAttribute("user", member); redirect("/overview"); } else { Warnings.getWarnings(request) .addMessage( Warnings.Message.Type.ERROR, "Login failed!", "Username and password combination was not found."); } } else { Warnings.getWarnings(request) .addMessage( Warnings.Message.Type.ERROR, "Login failed!", "Username and password combination was not found."); } }