Hibernate is an exceptional case, it can be used as internal container library to provide EJB3 implementation and all libraries used by hibernate must be designed with this assumption too. CGLIB is designed to be used by container implementation, but it is very simple in our case, correct class loader is known at code generation time: persistentClass.getClassLoader() == proxy.getClass().getClassLoader() (subclass and superclass must be in the same class loader to avoid "IllegalAccessError" for package classes and methods) Class unloading is more complicated. But I see nothing wrong to design libraries without deployment assumption, it works for managed application without problems if deployment is correct(library is deployed with application itself)
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