ServerSocket.isBound() continue to return true after close() is called.

[Michael McMahon]

Norman

The specification on what happens to all socket types was updated many 
years ago
in bug id 6505016, but it looks like ServerSocket::isBound was missed 
from that effort.
I think we should probably update the spec to reflect current behavior 
and be consistent
with the change above. There will be some small spec updates to 
ServerSocket coming
which originated from the SocketImpl replacement work that Alan 
mentioned recently
and I think we can include this small change probably with one of those.

Michael.

On 11/04/2019, 13:40, Norman Maurer wrote:
> Hi there,
>
> While working on netty I just noticed that a ServerSocket will keep 
> return true when isBound() is called even after it was closed. Is this 
> by design? I was bit surprised by this honestly as after the socket is 
> closed there is no way it will accept any more connections.
>
> If this is by design should we at least update the java docs ?
>
> https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/net/ServerSocket.html#isBound() 
> <https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/net/ServerSocket.html#isBound%28%29>
>
> In contrast for DatagramSocket it is directly called out:
>
> https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/net/DatagramSocket.html#isBound() 
> <https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/net/DatagramSocket.html#isBound%28%29>
>
> So I wonder if it was mainly done the same way for a ServerSocket to 
> be more consistent here or if it is just an oversight.
>
> This code shows the behaviour.
>
> ServerSocket socket =newServerSocket(0);
>
> socket.close();
> if(socket.isBound()) {
>      throw newAssertionError();
> }
>
>
>
> Thanks,
> Norman
>
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