The class cache

[Tal Liron]

In Nashorn, the ClassCache is set per Global instance.

This is fine if your application has only one global instance. However, 
my application design involves creating many Global instances. 
(Actually, I create and destroy them on the fly per user request in an 
HTTP server scenario.) The problem is that all code has to constantly be 
recompiled, and the cache is essentially never used. Since recompilation 
is so very expensive in Nashorn, this results in awful performance.

How can I implement a shared ClassCache? I can't extend and modify 
Global behavior, because it's a final class.

I've tried to cache ScriptFunction instances myself, but I get 
exceptions when I try to run them with a different Global instance than 
the one that created them.