Multiple NioSocketAcceptors bound on same port?!

[Alex Stumpfl]

Hi,

I did a really simple server for testing purposes.
I figured out that I can start two of them on the same port and
wondering why I'm not getting the typical "java.net.BindException:
Address already in use" or the like?!
Both servers pretend to be "active" but only one really is.
And when I stop the "winner" the sencond one takes over...

So, how can I get back my BindException?
Is this an NIO problem?

Thanks! Best Regards, Alex ;)

public class SimpleServer {
    private static final int PORT = 6597;
    public static void main(String[] args) throws IOException {
        final SocketAcceptor acceptor = new NioSocketAcceptor();
        acceptor.setHandler(new IoHandlerAdapter());
        acceptor.bind(new InetSocketAddress(PORT));
        System.err.println(acceptor.isActive());
    }
}