Quartz2.x: GRAVE: web应用程序[/servlet]似乎启动了一个名为[Thread-4]的线程，但未能阻止它

Question

当我使用Quartz 2.x运行我的web应用程序时，我收到了这条消息。它运行良好，但我在声明服务器时得到了此错误。

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.

任何帮助都很感激。

Answer 1

这可能是由于Tomcat关机或web应用程序重新部署时没有关闭Quartz调度程序(很可能是您的情况)造成的。

您需要实现一个ServletContextListener，在它的contextDestroyed方法中您需要这样做：

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

您还可以配置Quartz线程池，将其线程标记为“守护进程线程”(org.quartz.threadPool.makeThreadsDaemons=true)，因为它们不会阻止JVM停止。否则，JVM将等待所有这些工作线程完成。