当我尝试使用closeFuture()关闭io.netty.channel.Channel时,Netty应用程序挂起

当我尝试关闭io.netty.channel.Channel TCP/IP客户端连接时,My Netty应用程序挂起.

我做:

ch.isOpen(); //this is TRUE
ch.closeFuture().sync(); //never returns

线程调用同步的堆栈跟踪在这里.

JavaFX Application Thread@583, prio=5, in group 'main', status: 'WAIT'
at java.lang.Object.wait(Object.java:-1)
at java.lang.Object.wait(Object.java:502)
at io.netty.util.concurrent.DefaultPromise.await(DefaultPromise.java:260)
at io.netty.channel.DefaultChannelPromise.await(DefaultChannelPromise.java:129)
at io.netty.channel.DefaultChannelPromise.await(DefaultChannelPromise.java:28)
at io.netty.util.concurrent.DefaultPromise.sync(DefaultPromise.java:224)
at io.netty.channel.DefaultChannelPromise.sync(DefaultChannelPromise.java:117)
at io.netty.channel.DefaultChannelPromise.sync(DefaultChannelPromise.java:28)
at MyClient.stop(MyClient.java:46)

有什么东西可以阻止频道关闭吗？我可以用另一种方式强制关闭吗？

谢谢!