Basically I want to create a rock solid server.

while (keepRunning.get()) {
    try {
        Socket clientSocket = serverSocket.accept();

        ... spawn a new thread to handle the client ...
    } catch (IOException e) {
        e.printStackTrace();
        // NOW WHAT?
    }
}

In the IOException block, what to do? Is the Server socket at fault so it need to be recreated? For example wait a few seconds and then

serverSocket = ServerSocketFactory.getDefault().createServerSocket(MY_PORT);

However if the server socket is still OK, then it is a pity to close it and kill all previously accepted connections that are still communicating.