Question

在我的webapp中，我有一些类，用于使用run（）例程扩展线程类。关闭tomcat时我遇到了问题所以用catch the error and print the stack trace替换了线程实现。

然而它仍然无效：在我的eclipse控制台中关闭tomcat时，会出现如下日志语句：

org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [Appname] appears to have started a thread named [Timer-1] but has failed to stop it. This is very likely to create a memory leak.

超时后我总是收到一条消息，tomcat没有响应，我必须手动终止它。

我在我的servlet的init（）和destroy（）方法中启动它们，如下所示：

public void init() throws ServletException
    {
            worker = new worker();
            worker.schedule();
    }


    public void destroy()
    {
            worker.shutdownTimer();
            worker = null;
    }

方法如下：

private ScheduledExecutorService mScheduler = null;

public void schedule()
    {
        scheduler = getScheduleService();
        scheduler.scheduleAtFixedRate(new Runnable()
        {
            public void run()
            {
                //...things to do in the routine
            }
        }, 
        1,     //start after 1 second
        10,    //wait 10 seconds 
        TimeUnit.SECONDS);
  }

private ScheduledExecutorService getScheduleService()
    {
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1, new ThreadFactory()
        {
            public Thread newThread(Runnable r)
            {
                Thread thread = new Thread(r);
                // allow the JVM to kill the scheduled task
                thread.setDaemon(true);
                return thread;
            }
        });
        return scheduler;
    }

    public void shutdownTimer()
    {
        if (scheduler != null)
            scheduler.shutdownNow();
    }

在我的调试器中，我可以看到executorservice已经开始跟随线程：

Daemon Thread [Timer-0] Running
Thread [pool-3-thread-1] Running

为什么ExecutorService启动正常的线程池？

当我明确告诉它在我的servlet中将它们关闭时，jvm什么时候仍然有关闭这些线程的问题？

关闭（守护程序）线程时Tomcat挂起（ScheduledExecutorService）

0 个答案: