JEP draft: Prepare to make final mean final

Hmm, not a bad approach.

I think the one thing that'd be nice is if I could somehow tell the JVM from a class that this class is open for final mutation rather than needing special flags passed into the JVM or special manifests in the Jar. It's often pretty clear to me, as a dev, what I when I need something to have final mutation (generally only with serialization objects).

For example,

    @FinalMutatableByReflection
    class Foo {
      final String bar;
    }

That'd allow me to transition code by just adding an annotation where it needs to be while also getting the benefit that final is really final everywhere else in code that isn't working with serialization.

They actually have a very similar proposal in the draft already:

    The sun.reflect.ReflectionFactory class only supports deserialization of objects whose classes implement java.io.Serializable

That is, you'll still be able to mutate final fields using the ReflectionFactory class, as long as that class inherits from Serializable

I know this isn’t the most relevant but to see the sun namespace still exists gives me a small amount of joy