Java – is it possible to inherit and modify the final class of bytecode in some way?

Can I inherit the final class using bytecode operations?

Solution

Yes, No

You can use bytecode operations to change the final class to a non - final class This does not even break binary compatibility, so there is no risk of classloader / verifier errors

However, you must apply bytecode modifications to the final class itself You cannot bytecode a subclass to inherit from the final parent Or more precisely, if you do, the validator will reject the modified subclass when loaded with the final parent