How to resolve the possibility of losing data of NIO programming

I have a peer to peer application, in each side, there's two thread, one (thread A) accepting new connection from according peer and receiveng data, the other (Thread B)create a connection to peer, send message and close the connection.
such scenario will occur:
1. [thread B] create a SocketChannel and connect to peer, and register to A.selector
2. [thread B] send a request to peer
3. peer send response back
3. [thread B] close SocketChannel
4. [thread A] select
so when thread A run Selector.select(), the SocketChannel has been unregistered from the selector because it has been closed, so A can not get the response.
How to resolve this problem, thanks!

Looking a bit more carefully at your example
Why are you closing the channel after you send if you intend to read more from it? You should only close when you are done both sending and receiving.
Also this example appears simple enough to do without using Selectors, and if do use them you don't need multiple threads.

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How to resolve the possibility of losing data of NIO programming

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