GetNetworkInterfaces() missing some interfaces

Hi there,
I want to retrieve a list of installed network interfaces and I am using:
        try
            Enumeration<NetworkInterface> nifs = NetworkInterface.getNetworkInterfaces();
            while (nifs.hasMoreElements())
                NetworkInterface nif = nifs.nextElement();
                System.out.println("Interface: " + nif.getName());
        catch (SocketException ex)
            Logger.getLogger(Net.class.getName()).log(Level.WARNING, null, ex);
        }The problem is, that it does not show all interfaces - this is what it shows:
wlan0
lo(I am currently connected via WLAN)
and here is the correct list (output of "ifconfig -a"):
eth2      Link encap:Ethernet HWaddr 00:23:ae:2d:78:f3
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
          Interrupt:16
lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:63292 errors:0 dropped:0 overruns:0 frame:0
          TX packets:63292 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5388083 (5.3 MB) TX bytes:5388083 (5.3 MB)
vboxnet0 Link encap:Ethernet HWaddr 0a:00:27:00:00:00
          BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0     Link encap:Ethernet HWaddr 00:22:fb:52:22:68
          inet addr:10.0.0.4 Bcast:10.0.0.255 Mask:255.255.255.0
          inet6 addr: fe80::222:fbff:fe52:2268/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:139968 errors:0 dropped:0 overruns:0 frame:0
          TX packets:115120 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:119590540 (119.5 MB) TX bytes:26182224 (26.1 MB)
wmaster0 Link encap:UNSPEC HWaddr 00-22-FB-52-22-68-35-32-00-00-00-00-00-00-00-00
          UP RUNNING MTU:0 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)If you now wonder why there is an eth2 but not eth0 this could be because there was a network card that got removed (a good while ago). Why the hack are the others not available in the enumeration of network interfaces? I am using Sun JDK 1.6 update 20:
java -version
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) Server VM (build 16.3-b01, mixed mode)

I have made several tests and found out that: As soon as I plug in a cable to the interface eth2 then it is recognized. Even if I then plug it off. After reboot it is again not showing up any more.
I am using Ubuntu 9.10 - is it possible that there is an issue with the sun Java runtime on Linux/Ubuntu?
Tried it with the OpenJDK - no, same issue here.
It is really a headache and I already searched the internet - samples to retrieve the interfaces are always basically the same and nobody writes that only interfaces are reported by getNetworkInterfaces() that are up (or have been up recently).
I tested also with the virtualbox - as soon as I start one of the virtual machines the interface shows up.
I started to think it could be an issue of the single machine... - tested on a different machine with very slightly different hardware on Ubuntu 10.04 - same issue here!
I tested on a Windows 2003 machine - there it seems to work even for interfaces that are not up.
Finally tested on Windows 7 and guess what: Even ipconfig /all does not show all interfaces - super crap!
WUUAAHH!
I think I must give up on getting the list of network interfaces in a reliable and platform independent way as even calling the OS specific tools Windows 7 fools me...

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