java - 在SingleThreadExecutor中出现java.util.concurrent.RejectedExecutionException的可能原因是什么？

我在单例中创建以下执行程序:

   final private ExecutorService executor = Executors.newSingleThreadExecutor(new ThreadFactory() {
        final ThreadFactory delegate = Executors.defaultThreadFactory();
        public Thread newThread(Runnable paramAnonymousRunnable) {
            Thread localThread =      this.delegate.newThread(paramAnonymousRunnable);
            localThread.setName("MyTask-" + localThread.getName());
            localThread.setDaemon(XXX.this.daemonThread);
            return localThread;
        }
    });

在程序执行期间，对单例的此方法有很多调用。调用可以在不同的线程中完成，也可以同时进行。

private void send(final String paramString) {
  try {
      this.executor.execute(new Runnable() {
          public void run() {
              //DO some interesting stuff
          }
      });
  } catch (Exception localException) {
    this.handler.handle(localException);
  }

}

在某些时候，以下堆栈开始出现:

java.util.concurrent.RejectedExecutionException
        at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1774)
        at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:768)
        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:656)
        at java.util.concurrent.Executors$DelegatedExecutorService.execute(Executors.java:589)
        at XXXXX.send(XXXX.java:269)

为什么jvm会抛出这样的异常？

singleThreadExecutor由LinkedBlockingQueue()支持。
而且线程池没有关闭。

有关信息，jvm是oracle jdk 1.6。单例是用spring创建的。
从java.util.concurrent.Executors复制:

   public static ExecutorService newSingleThreadExecutor(ThreadFactory threadFactory) {
       return new FinalizableDelegatedExecutorService
           (new ThreadPoolExecutor(1, 1,
                                0L, TimeUnit.MILLISECONDS,
                                new LinkedBlockingQueue<Runnable>(),
                                threadFactory));
   }

最佳答案

execute会抛出RejectedExecutionException的原因有两个

队列已满，您不能再添加任何线程

ThreadPool已关闭

因为您使用的是LinkedBlockingQueue，所以我看到这种情况的唯一方法是因为您关闭了该池。