Executor的捕获异常，线程池

Question

对于一个线程，我通过下面的代码段捕获了uncaught exception。但是，对于ExecutorService executor = Executors.newFixedThreadPool(10);，如何捕获未捕获的异常？

Thread.UncaughtExceptionHandler h = new Thread.UncaughtExceptionHandler() {
    public void uncaughtException(Thread th, Throwable ex) {
        System.out.println("Uncaught exception: " + ex);
    }
};

Answer 1

您可以使用方法newFixedThreadPool的重载，该方法接受ThreadFactory：

Thread.UncaughtExceptionHandler eh = ...;
ThreadFactory factory = r -> {
    Thread t = new Thread(r);
    t.setUncaughtExceptionHandler(eh);
    return t;
};
ExecutorService executor = Executors.newFixedThreadPool(10, factory);

Answer 2

添加到以上答案中，您可以使用Executors defaultThreadFactory并添加自己的uncaughtExceptionHandler。它将更好地管理线程。

ExecutorService executorService = Executors.newFixedThreadPool(10, runnable -> {
        Thread t = Executors.defaultThreadFactory().newThread(runnable);
        t.setUncaughtExceptionHandler((Thread th, Throwable e) -> {e.printStackTrace();});
        return t;
    });