Receiving open sockets from the environment in Java

Question

systemd supports socket activation, which means that sockets will be passed to the daemon process as open file descriptors. Is there any way to retrieve and use these sockets from Java?

Answer 1

Yes, this is what System.inheritedChannel() is for.

On the systemd side, you should be able to make your service file pass the socket as fd 0 (which is what Java expects) by setting StandardInput=socket.