java - ThraPool 与 LinkedBlockingQueue 在队列为空时拒绝任务

Question

我使用以下代码创建了一个线程池

ThreadPoolExecutor backgroupTaskPool = new ThreadPoolExecutor(100, 100, 10, TimeUnit.SECONDS,  new LinkedBlockingQueue<Runnable>(100));
backgroupTaskPool.allowCoreThreadTimeOut(true);

当向该池提交任务时，会抛出RejectedExecutionException，但池中的线程未达到maximumPoolSize并且LinkedBlockingQueue为空:

Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@15e9aebd rejected from java.util.concurrent.ThreadPoolExecutor@7774348b[Shutting down, pool size = 9, active threads = 9, queued tasks = 0, completed tasks = 105]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2048)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:821)

您知道为什么会发生这种情况吗？

谢谢。

Answer 1

基于异常消息

Task java.util.concurrent.FutureTask@15e9aebd rejected from java.util.concurrent.ThreadPoolExecutor@7774348b[Shutting down, pool size = 9, active threads = 9, queued tasks = 0, completed tasks = 105]

您似乎正在关闭ThreadPoolExecutor。调用shutdown后，您将无法提交任务。