使用Java Shutdown Hook无法将注销时间存储在COMPUTER'S LOGOUT上

Question

I am trying to store the time into a database when a user logs-off or logs-in into the computer but when I logs my computer off it does not store my current time into the database where if I press ctrl+c on console or terminate the program from NETBEANS it stores the logout time too. Where am I doing it wrong ? Please help me out with this. Below is my code. Thank you in advance.

  public void logoutTime() throws Exception {

    Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
        @Override
        public void run() {

            SimpleDateFormat sdf1 = new SimpleDateFormat("HH:mm:ss");
            String time = String.format(sdf1.format(calendar.getTime()));

            Globals.globalClockBean.setLogout_time(time);
            try {
                cd.insert(Globals.globalClockBean);
            } catch (Exception ex) {
                Logger.getLogger(ClockController.class.getName()).log(Level.SEVERE, null, ex);
            }
            System.out.println("Closing: Logged out at yayyyyyyyyy: " + time);

            System.out.println(sdf1.format(calendar.getTime()));
        }

    }));

Answer 1

My guess is that when you log off, operating system shuts down the database before the JMV shutdown hook is called. So when you are trying to call the DB, it is actually down.

Try to setup a file logger and check if an exception is logged after you log off from computer. My guess is that there will be some "Connection failed" type of exception

Answer 2

当您仅从计算机注销时，不会关闭jvm，则不会调用该挂钩。