value type hygiene

Brian Goetz brian.goetz at
Fri May 11 17:13:19 UTC 2018

I get the motivation for this.  FTR, though, I am pretty skeptical that 
such unexpected and hard-to-explain NPEs won't show up more frequently 
than the ignorability threshold, and the result will be a perception 
that Java is unstable.  (Remember, people mix and match with libraries 
that have been compiled at all different language levels.)

On 5/10/2018 9:36 PM, John Rose wrote:
> Again, JVM could go the extra mile to make this problem
> disappear, by re-organizing the calling sequence of the override
> tree as soon as the first legacy method shows up.  For simplicity
> I'd rather exclude this tactic until forced by experience to add it.
> It seems like a heroic optimization to me, seldom used and likely
> to be buggy.  It also seems to spoil the whole performance party
> when one bad actor shows up, which looks dubious to me.

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