Server not recognizing a valid connection

Question

Hi,
After reading about Java NIO for some time I have built a server and very simple client. The server
accepts connection requests and stores them as non blocking socket channels in a selector.
The selector executes the select() method every second. ie)selector.select(1000).
Below is the the client code I use to connect to the server.
                int sleepCount = 0;
          int written = 0;
          InetSocketAddress ins = new InetSocketAddress("192.168.2.102", 7777);
          SocketChannel sock = SocketChannel.open(ins);
          try{
               sock.finishConnect();
          }catch (IOException ioe){
               ioe.printStackTrace();
          String msg = new String("[Client Message]");
          byte bmsg = msg.getBytes();
                ByteBuffer buffer = ByteBuffer.wrap(bmsg);
          while(sleepCount < 2){
               written = sock.write(buffer[0]);
               System.out.println("Message printed = " + written);
               buffer[0].rewind();
               try {
                          long numMillisecondsToSleep = 1000; // 1 second
                    Thread.sleep(numMillisecondsToSleep);
                      } catch (InterruptedException e) {
               sleepCount++;
               written = 0;
          sock.close();
     This is just basic code to connect to the server and send some text every second.
The server detects the connection by this program. The server also successfully reads in the message and outputs it to screen(btw, I am running the server in one linux terminal and the client in another seperate terminal).
When the client is finished it closes the connection. The server notices this because the next read it does returns -1. So the socket channel on the server end is closed as well with the close() method.
Now when the server is still running and I execute the above client code again for a second time the server doesn't notify me that a connection has been accepted like it did last time. The client program connects successfully without any exceptions. It then proceeds to send the text message to the server again, once per second.
However the server doesn't do anything. The select() method returns 0 keys that are ready for IO.
How is this possible? The server is saying nothing is connecting to it, however the client connects fine and proceeds to send the server data.
Thanks,
Nick

Answer 1

baah!
I saw the problem 15 minutes after I posted to the forum.
It was this line in my server
key.interestOps(key.interestOps() & ~readyOps);
It removes the interest from the key. I used it from an example I saw that "Deactivates" a keys interest when it is working with that key. So in my case when a key was isAcceptable it would "deactivate" OP_ACCEPT flag for that key representing the ServerSocketChannel.
When I was finished accepting an incoming connection I forgot to "re-activate" the channels interest in OP_ACCEPT again. Hence why the client would only connect once. After one connection the server wasn't interested in incoming connections anymore.
Nick