Allocate free port from an ephemeral port range

Network.java

import java.io.IOException;
import java.net.ServerSocket;

public final class Network {

    private Network() {
        // Do nothing.
    }

    public static int findFreePort() {
        try (ServerSocket socket = new ServerSocket(0)) {
            return socket.getLocalPort();
        } catch (IOException e) {
            throw new UnsupportedOperationException("Socket Exception while opening socket.", e);
        }
    }
}