ServerSocketChannel.socket() is still bound after close()

Question

I Used java.nio for server programming and it works fine. When I try to close socket:

    serverChannel.socket().close();

        serverChannel.close();  

    boolean b1 = serverChannel.socket().isBound();   
  boolean b2 =
     serverChannel.socket().isClosed();

and check values, b1 is true and b2 is true. When I run netstat I see that state od port is "LISTENNING" While I was using "old" IO, closing socket did excatly what I expected (netstat did not list port as Listenning).

How can I "unbind" socket without shuting down JVM?

Answer 1

I Got the solution. We have to keep in mind that keys contains serverSocketChannel as well.

if(this.serverChannel != null && this.serverChannel.isOpen()) {

    try {

        this.serverChannel.close();

    } catch (IOException e) {

        log.error("Exception while closing server socket");
    }
}

try {

    Iterator<SelectionKey> keys = this.selector.keys().iterator();

    while(keys.hasNext()) {

        SelectionKey key = keys.next();

        SelectableChannel channel = key.channel();

        if(channel instanceof SocketChannel) {

            SocketChannel socketChannel = (SocketChannel) channel;
            Socket socket = socketChannel.socket();
            String remoteHost = socket.getRemoteSocketAddress().toString();

            log.info("closing socket {}", remoteHost);

            try {

                socketChannel.close();

            } catch (IOException e) {

                log.warn("Exception while closing socket", e);
            }

            key.cancel();
        }
    }

    log.info("closing selector");
    selector.close();

} catch(Exception ex) {

    log.error("Exception while closing selector", ex);
}

Does Selector.close() closes all client sockets?