石英：內存泄漏？

Question

我正在使用Quartz來每小時運行一項工作。 Servlet在Tomcat上運行，我正在使用ServletConextListener來偵聽上下文何時被銷燬。

當我關閉Tomcat，我得到的消息：

「似乎已經開始了一個名爲[MyScheduler_Worker-1]線程，但未能阻止它」。

但後來我看到這條消息：

「[DEBUG] 11年9月28日：45：26.671 AM MyScheduler_Worker-1 [org.quartz.simpl.SimpleThreadPool]

的WorkerThread被關閉。」

因此，假設這個線程沒有內存泄漏是安全的嗎？

這裏是我的日誌的外觀：

{SEVERE: The web application [/*************] appears to have started a thread 

named [MyScheduler_Worker-1] but has failed to stop it. This is very likely to c 

reate a memory leak. 

Sep 28, 2011 11:45:26 AM org.apache.catalina.loader.WebappClassLoader clearRefer 

encesThreads 

SEVERE: The web application [/*************] appears to have started a thread 

named [MyScheduler_Worker-2] but has failed to stop it. This is very likely to c 

reate a memory leak. 

Sep 28, 2011 11:45:26 AM org.apache.catalina.loader.WebappClassLoader clearRefer 

encesThreads 

SEVERE: The web application [/*************] appears to have started a thread 

named [MyScheduler_Worker-3] but has failed to stop it. This is very likely to c 

reate a memory leak. 

[DEBUG] 28 Sep 11:45:26.671 AM MyScheduler_Worker-2 [org.quartz.simpl.SimpleThre 

adPool] 

WorkerThread is shut down. 



[DEBUG] 28 Sep 11:45:26.671 AM MyScheduler_Worker-1 [org.quartz.simpl.SimpleThre 

adPool] 

WorkerThread is shut down. 



[DEBUG] 28 Sep 11:45:26.671 AM MyScheduler_Worker-3 [org.quartz.simpl.SimpleThre 

adPool] 

WorkerThread is shut down. 

Answer 1

你可以假設不存在內存泄漏，因爲你看到線程關閉消息。但是，可能會在關閉前通過清理線程來發出警告。

The shutdown-hook plugin catches the event of the JVM terminating, and calls shutdown on the scheduler. 

詳情： - http://quartz-scheduler.org/documentation/quartz-2.x/configuration/ConfigPlugins

Answer 2

我知道這是一個古老的線程，但萬一別人都在尋找它。

我們一直使用線程的警告，直到我們在ServletContextListener.shutDown（）方法中添加了關閉Quartz Scheduler的代碼。

要關閉計劃：

  quartzScheduler.shutdown(); 

      int ct = 0; 

      // Try waiting for the scheduler to shutdown. Only wait 30 seconds. 
      while(ct < 30) { 
       ct++; 
       // Sleep for a second so the quartz worker threads die. This 
       // suppresses a warning from Tomcat during shutdown. 
       Thread.sleep(1000); 
       if (quartzScheduler.isShutdown()) { 
        break; 
       } 
      }