The Java goal does not allow pollution (Score 1)

but you can't have WORA if there are different versions.

You can if the spec is tight enough (it might be,
it is certainly tighter than C's) and if the
different VMs conform to the spec. It would
help if Sun conformed to their own spec in the
area of JNI, and it would be nice if someone
could verify that Sun's JCT only checked for
those things defined in the spec (I've heard that
if you don't run it in the Pacific Time Zone,
you cannot pass), but such is life. It looks
like a huge step in the right direction, and
it is much easier to write portable code in
Java than it is to write it in C or C++.