java - 线程抛出 RuntimeException - 对线程池的影响

Question

我刚刚读了this article并认为如果 Runnable 抛出异常并退出，线程池可能会用完工作线程。我做了一个小代码并进行了检查，但池大小没有变化。

public class ThreadPoolTest {

public static void main(String[] args) throws InterruptedException {
    ThreadPoolExecutor tp = new ThreadPoolExecutor(1, 1, 5, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(1));
    Thread.sleep(1000);
    System.out.println(tp.getPoolSize());
    tp.execute(new Runnable(){

        @Override
        public void run() {
            System.out.println("Executing & Throwing");
            throw new NullPointerException();
        }

    });
    Thread.sleep(1000);
    System.out.println(tp.getPoolSize());
    tp.execute(new Runnable(){

        @Override
        public void run() {
            System.out.println("Executing & Throwing");
            throw new NullPointerException();
        }

    });
    Thread.sleep(1000);
    System.out.println(tp.getPoolSize());
    tp.shutdown();
}

我得到的输出是

0
Exception in thread "pool-1-thread-1" java.lang.NullPointerException
    at threads.ThreadPoolTest$1.run(ThreadPoolTest.java:18)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Executing & Throwing
1
Exception in thread "pool-1-thread-2" java.lang.NullPointerException
    at threads.ThreadPoolTest$2.run(ThreadPoolTest.java:29)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Executing & Throwing
1

这是在 Java 7 上。是否有文章中所述的易受攻击的 java 线程池实现？

Answer 1

阅读这篇文章，要点是写得不好的线程池可能会遇到这个问题。事实上，任何创建线程并且不/不能处理来自该线程的未捕获异常的应用程序。

我希望任何信誉良好的线程池来源都能以某种方式处理这种情况。通过信誉，我会包括 Oracle 来源的解决方案。我怀疑如果有人手工编写线程池代码并且他们缺乏经验，那么他们会编写一个不太健壮的解决方案。