Java ScheduledThreadPool 多线程在一段时间后停止

Question

I´m developing a J2SE app that sync GPS information of 184 cars stored at four databases on differents servers. For every car I create a Thread and stored in a ScheduledThreadPool

    ScheduledExecutorService executor = Executors.newScheduledThreadPool(20);

    for (int i = 0; i < cars.size(); i++) {
        Car vec_temp = cars.get(i);
        SyncThread carThread = new SyncThread(q, vec_temp, reintentos);
        long sleep = carThread.calculateVehicleDelay();
        executor.scheduleAtFixedRate(hilo, 0, sleep, MILLISECONDS);
    }

Information of Latitude and Longitude is retrieved by a SocketServer in XML data, so inside the SyncThread Class I instanciate a Socket and ask for information and close that connection, and make this every 15 minutes...

The app start working great for some reason at some time stops running with no Exception...

The jar is running as a windows service.

Answer 1

According to the API ,

If any execution of the task encounters an exception, subsequent executions are suppressed.

That being said, it would be nice if you posted the code inside SyncThread , otherwise it'll be nearly impossible to help you. Also, what's hilo ? Why are you scheduling hilo to be executed, rather than carThread ?

Answer 2

Try putting up a try-catch block in your Runnable implementation. Idea is to suppress any exceptions from being thrown out to the executor. Ideally, if you could log this incident in your catch block and avoid throwing it out, your application should work as expected, and you will be able to identify what happened afterwards.