Java & Windows (7): Reliably getting IPv4 netmask?

I've run into a known bug with Java 6 on Windows. My understanding is that the normal way to get the netmask is to look up the network prefix length and do some bit shifts. The problem is that on Windows the prefix length is often returned incorrectly, so we get a 128 when we should get a 24 or 20.
At http://stackoverflow.com/questions/1221517/how-to-get-subnet-mask-using-java, it is suggested to put -Djava.net.preferIPv4Stack=true on the Java command line. Unfortunately, on Windows 7, adding that as either a VM parameter or on the Java command line seems to have no effect.
(a) Does anyone know any OTHER work-arounds for this problem that might still work on Windows 7?
(b) Alternatively, is there an entirely different way to get the netmask that is reliable?
Thanks!

On CodeRanch, someone explained that I had made an etiquette error by not listing the other places where I have asked this question.
Here they are:
http://stackoverflow.com/questions/9299566/java-windows-7-reliably-getting-ipv4-netmask
http://www.codeguru.com/forum/showthread.php?t=521196
Java & Windows (7): Reliably getting IPv4 netmask?
http://www.coderanch.com/t/567601/sockets/java/Java-Windows-Reliably-getting-IPv
I am actively monitoring each site.
Explanation: I first posted on StackOverflow, but I didn't get a response. Usually I'm amazed at how quick people are to respond on that site, so I'm assuming the lack of response is due to this being a hard problem. I've been digging pretty hard on this, and most I've seen is some suggestions as to how to fix the problem in Java itself, but no work-arounds that actually work for me. Thus, I was motivated to post in multiple places in the hope that I'd get some help somewhere.
Sorry for the confusion.
Edited by: 915022 on Feb 16, 2012 8:55 AM
Edited by: 915022 on Feb 16, 2012 9:01 AM

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