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would be rather tricky to implement.  What is easy is to set up a
guard zone and take a fault when it's hit.  However, Java requires
you to safely recover from a stack overflow via StackOverflowErrors.
This will at least require using an alternate signal stack; plus you
need to have an OS/libc that doesn't freak out when you run and/or 
longjmp out of a signal handler with SA_ONSTACK set.  It's one of these
things where there is no reason that it shouldn't work, but (at least
my personal) experience indicates that it can be hard and a timesink
to get it working.  If you get it working, I'd definitely be happy to 
add it.

	- Godmar