无法停止工作线程，可能会造成内存泄漏。

Question

我正在使用实现 ServletContextListener 的 servlet 来启动石英调度程序实例@starup。在 contextDestroyed() 方法中，调度程序实例被停止。

@Override
public void contextDestroyed(ServletContextEvent sce) {
    try {
        Scheduler scheduler = QuartzSchedulerUtil.getCurrentScheduler();
        scheduler.shutdown(true);
        // Sleep for a bit so that we don't get any errors
        Thread.sleep(1000);
        Driver mySqlDriver = DriverManager.getDriver(hibernateConnectionUrl);
        DriverManager.deregisterDriver(mySqlDriver);
    } catch (SchedulerException ex) {
        Logger.getLogger(QuartzServlet.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InterruptedException ex) {
        Logger.getLogger(QuartzServlet.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SQLException ex) {
        Logger.getLogger(QuartzServlet.class.getName()).log(Level.SEVERE, null, ex);
    }        
    System.out.println("THE QUARTZ APP STOPPED");
}

但是在部署应用程序时，我会收到内存泄漏警告，指出woker 线程没有停止。

Jul 10, 2012 3:46:12 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/latest-raisin]
appears to have started a thread named [Timer-0] but has failed to
stop it. This is very likely to create a memory leak.

Jul 10, 2012 3:46:12 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/latest-raisin]
appears to have started a thread named 
[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] but
has failed to stop it. This is very likely to create a memory leak.

Jul 10, 2012 3:46:12 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/latest-raisin]
appears to have started a thread named
[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] but
has failed to stop it. This is very likely to create a memory leak.

Jul 10, 2012 3:46:12 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/latest-raisin]
appears to have started a thread named
[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2] but
has failed to stop it. This is very likely to create a memory leak.

我尝试了帖子中提到的解决方案 - http://forums.terracotta.org/forums/posts/list/15/4341.page 但是在取消部署应用程序时仍然会收到严重的内存泄漏警告。

Answer 1

您可以设置org.quartz.scheduler.interruptJobsOnShutdown 中的属性以在您想要关闭时中断作业（如果它们仍在执行中）。