未能停止工作线程，可能会造成内存泄漏

Question

我正在使用一个实现ServletContextListener的servlet来启动石英调度器实例@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");
}

但是当部署应用程序时，我会收到内存泄漏警告，指定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但当应用程序未部署时，仍会收到严重内存泄漏警告。

Answer 1

您可以在org.quartz.scheduler.interruptJobsOnShutdown中设置属性，以便在想要关闭时，如果作业仍在执行中，则中断作业。