Opening and checking VPN's

[Hugh Mackay]

I have written a program that sends data down a socket to a server.
The socket connection relies on the host PC having an active VPN to
the server network. Is there a way of checking the existence of an
open VPN and re-opening it should it close, in Java?
I have looked at the sun site and couldn't find anything.
Can anyone point me in the right direction for more info or tell me if
it is even possible?
Cheers.