When using JPA / Hibernate, classes annotated with @Entity can be more-or-less transparently stored, queried, retrieved, and so on from a database.
However, when you operate with an instance retrieved via JPA, you are actually operating with a proxy object, of a class created by the JPA provider (in my case, Hibernate) when the application was started.
Is it possible to inspect / decompile this generated proxy class, out of sheer curiosity? One option is to look up and patch the sources from Hibernate itself - however, I would rather run the application and dump and/or locate the generated classes directly.
Hibernate uses javassist as a bytecode provider.
Hibernate can also do bytecode weaving at compile time. Since this is created at compile time it, it is much easier to decompile and inspect the woven classes.
https://docs.jboss.org/hibernate/orm/5.0/topical/html/bytecode/BytecodeEnhancement.html