dubbox在tomcat容器中使用，shutdown关闭的时候JVM无法结束 about dubbox HOT 11 OPEN

        try {
            final Class<?> clazz = Class.forName("com.alibaba.dubbo.remoting.transport.netty.NettyClient");
            Field field = clazz.getDeclaredField("channelFactory");
            field.setAccessible(true);
            Object channelFactory = field.get(null);
            Method method = channelFactory.getClass().getMethod("releaseExternalResources");
            method.invoke(channelFactory);
        } catch (Exception e){
            e.printStackTrace();
        }

@Override
public void onApplicationEvent(ApplicationEvent applicationEvent) {
    if (applicationEvent instanceof ContextStartedEvent){
        logger.debug("It was Started.");
    }

    if (applicationEvent instanceof ContextClosedEvent){
        ContextClosedEvent event = (ContextClosedEvent) applicationEvent;
        if(event.getApplicationContext().getParent()==null){
            logger.debug("App context was Closed.");
            synchronized (Main.class) {
                try {
                    Main.class.notifyAll();
                } catch (Throwable e) {}
            }
            Runtime.getRuntime().exit(0);
        }else{
            logger.debug("Web context was Closed.");
        }
        event = null;
    }
}

"Hashed wheel timer #1@4029" prio=5 tid=0x32 nid=NA sleeping
  java.lang.Thread.State: TIMED_WAITING
      at java.lang.Thread.sleep(Thread.java:-1)
      at org.jboss.netty.util.HashedWheelTimer$Worker.waitForNextTick(HashedWheelTimer.java:503)
      at org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:401)
      at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
      at java.lang.Thread.run(Thread.java:745)