@H_404_1@我有一个ExecutorService executor = Executors.newSingleThreadExecutor();我想在服务器关闭时停止.

@H_404_1@我有一个实现ServletContextListener的类,它用@WebListener注释.

@H_404_1@我在该课程中有两种方法：

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@Override
public void contextInitialized(ServletContextEvent servletContextEvent) {
    System.out.println("ServletContextListener started");
}

@Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
    executor.shutdown();
    executor.shutdownNow();
    System.out.println("ServletContextListener destroyed");
}

@H_404_1@而且我看到它在它们应该的时候打印出它们中的内容,但是当我在intelij中按下一次停止按钮时,我得到：

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@H_404_1@SEVERE: The web application [] appears to have started a thread named [pool-2-thread-1] but has Failed to stop it. This is very likely to create a memory leak.

@H_404_1@在它打印出ServletContextListener之后就被销毁了.

@H_404_1@我需要再次按下停止按钮才能完全停止它.

@H_404_1@为什么它不会关闭ExecutorService,即使它到达executor.shutdown();?我究竟做错了什么？

@H_404_1@PS：这是我唯一的ExecutorService,没有其他线程由我制作.

@H_404_1@EDIT2：

@H_404_1@执行程序服务是单例类中的一个字段,它使用类初始化：

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private ExecutorService executor = Executors.newSingleThreadExecutor();

@H_404_1@这是类的初始化方式(延迟初始化)：

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public static RoomsManager getRoomsManager(ServletContext servletContext) {
    if (servletContext.getAttribute(MANAGER_GAMES_ATTRIBUTE_NAME) == null) {
        servletContext.setAttribute(MANAGER_GAMES_ATTRIBUTE_NAME,new RoomsManager());
    }
    return (RoomsManager)servletContext.getAttribute(MANAGER_GAMES_ATTRIBUTE_NAME);
}

@H_404_1@并注释如下：

@H_404_1@

@WebListener
public class RoomsManager  implements ServletContextListener {

@H_404_1@停止按钮是intelij IDEA中播放和调试按钮附近的红色方块.