Quartz2.x：嚴重：Web應用程序[/ servlet]似乎已啟動名為[Thread-4]的線程，但未能停止它

Question

當我用Quartz 2.x運行我的Web應用程序時，我收到此消息。 它運行正常，但在聲明服務器時出現此錯誤

INFO: Server startup in 1792 ms
20 mai 2014 18:18:59 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [Thread-4] but has failed to stop it. This is very likely to create a memory leak.
20 mai 2014 18:18:59 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [CronTriggers_Worker-1] but has failed to stop it. This is very likely to create a memory leak.
20 mai 2014 18:18:59 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [CronTriggers_Worker-2] but has failed to stop it. This is very likely to create a memory leak.

任何幫助表示贊賞。

Answer 1

這可能是由於在Tomcat關閉或重新部署Web應用程序時未關閉Quartz調度程序引起的（很可能是您的情況）。

您將需要實現ServletContextListener，並在其contextDestroyed方法中執行以下操作：

scheduler.shutdown( true );  // true = wait for jobs to complete
// you may want to give Quartz some extra time to shutdown
//Thread.sleep(1000);

您可能還需要配置Quartz線程池，以將其線程標記為“守護程序線程”（org.quartz.threadPool.makeThreadsDaemons = true），因為它們不會阻止JVM停止運行。 否則，JVM將等待所有這些工作線程完成。