Let application class loader load specified classes from instrumentation class loader. Currently we create a proxy class that delegates to the helper class in instrumentation class loader. While the proxy classes work I feel it is more complicated than necessary. There are also some obscure limitations like how do you proxy a class that has a super class or implements interfaces that are also helper classes (not visible from application class loader) or what if the proxied type implements methods that either return or accept helper classes. That being said there is one area where proxies work but the proposed solution does not, that is instrumentations that run in boot loader. There is currently 1 instrumentation remaining that uses a proxy and that instrumentation runs in boot loader.