NIO Echo Server SocketChannel.write() multiple times?

Question

Hello,
I have found and experimented with two simple nio echo socket servers,
one from hutchinson's book. The other has similar code:
     if (key.isWritable())
     SocketChannel client = (SocketChannel) key.channel();
     ByteBuffer output = (ByteBuffer) key.attachment();
     output.flip();
     client.write(output);
                     output.compact();
     }but in my client, I noticed that when I send something to the server,
apart from echoing it back it also sends back about 90 empty
strings, which fire in my client's onData() event.
Is this normal or am I missing something?
Message was edited by:
Robse

Answer 1

This code is correct, and it can't send empty strings. The error is elsewhere.