That restriction was in the java license because java is
garbage-collected and the garbage collector can run at
arbittrary times and take however long it needs.  Thus,
hard realtime is not a good idea with java.  Whatever
faults java may have,  that license provision was not an
admission by Sun of any defects, just features.  BTW, I
don't see it in the license that comes with JDK 1.4101.
Why not IDK.