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Bind several times to the same port in Mac OS X


My PowerBook lets me bind to the same port twice using NIO. The following code throws an IOException under Windows and Linux, but not under Mac OS X:

 bindTwice( port) IOException
InetSocketAddress listenAddress = InetSocketAddress(port);
 
ServerSocketChannel firstChannel = ServerSocketChannel.open();
ServerSocket firstSocket = firstChannel.socket();
firstSocket.bind(listenAddress);
 
ServerSocketChannel secondChannel = ServerSocketChannel.open();
ServerSocket secondSocket = secondChannel.socket();
secondSocket.bind(listenAddress);


It wouldn't be too big a deal but I want my application to fail if it can't bind! One horrible problem that has come up in my tests is this:
1. Bind to port X as server.
2. Connect to self on port X as client.
Now the client has fully connected but server has not received anything! Another server process that has binded to the same port is receiving the data instead.

Is this a bug in the Mac JVM?

Any information on this problem will be appreciated, thanks!

Cheers,
Jesse Wilson
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