Quartz: failed to stop it. This is very likely to create a memory leak

在使用Tomcat，關閉quartz時，log顯示This is very likely to create a memory leak。
原因為
Tomcat在shutdown做清理工作的時候，未等待quartz完成cleanShutdown !
即完成AP 關閉動作。

解決方法:
再執行schedule.shutdown();後，做等待。

public void contextDestroyed(ServletContextEvent sce) {

try {

//終止Quartz引擎

log.info("終止Quartz引擎");

Scheduler schedule = schedulerFactoryBean.getScheduler();

if (!schedule.isShutdown()) {

schedule.shutdown();

Thread.sleep(2 * 1000);

}

} catch (Exception ex) {

log.error("終止Quartz排程引擎失敗", ex);

}

}

tomcat-quartz appears to have started a thread named [startQuertz_Worker-1] but has failed to stop i