Safe and ugly way to get the hostname in java

GetHostname.java

    public String getFirstHostname() throws Exception {
        Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface nic = networkInterfaces.nextElement();
            if (!nic.isLoopback() && nic.isUp()) {
                Enumeration<InetAddress> addresses = nic.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    InetAddress address = addresses.nextElement();
                    if (address instanceof Inet4Address) {
                        return address.getHostName();
                    }
                }
            }
        }

        return null;
    }