AsynchronousChannelGroup 在 shutdown 和 shutdownNow 无力！求解决啊

AsynchronousChannelGroup

shutdown 线程一直不关闭

shutdownNow 会抛出异常

java.nio.channels.AsynchronousCloseException
at sun.nio.ch.WindowsAsynchronousServerSocketChannelImpl$AcceptTask.failed(Unknown Source)
at sun.nio.ch.Iocp$EventHandlerTask.run(Unknown Source)
at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)


使用：

			this.channelGroup = AsynchronousChannelGroup.withFixedThreadPool(this.threadCount, Executors.defaultThreadFactory());

			// this.channelGroup = AsynchronousChannelGroup.withFixedThreadPool(this.threadCount, Executors.privilegedThreadFactory());

			// this.channelGroup = AsynchronousChannelGroup.withCachedThreadPool(Executors.newCachedThreadPool(), this.threadCount);

			this.serverChannel = AsynchronousServerSocketChannel.open(this.channelGroup);

			this.serverChannel.setOption(StandardSocketOptions.SO_REUSEADDR, true);

			this.serverChannel.bind(this.address);





		if (this.serverChannel.isOpen()) {

			Connection connection = new Connection();

			this.serverChannel.accept(connection, new ConnectionAcceptHandler());

		}

哪位大哥能帮忙...这怎么正常关闭啊？

--------------------编程问答-------------------- 除 --------------------编程问答-------------------- 确切说，应该是AsynchronousServerSocketChannel在close的时候抛出了这个异常... --------------------编程问答-------------------- 这是jdk1.7里面的吧，没用过，不大清楚！  lz是在找showdown和showdownNow的区别吗，如果是要关闭线程，为什么不用return呢

补充：Java ,  Java SE