JDK & native threads

[Gerald Gutierrez]

I'm starting to pull out my hair from the fact that the current JDK is
based on user threads. I can't call anything that can potentially block,
because everything will block.

An alternative is Kaffe, but it's too incomplete to be usable right now.
Is anyone working on producing a version of the JDK that uses native
threads ? I remember reading about some "problems" with this. What are
the problems ?

Thanks.