RFR: 8224243: Make AccessibleObject a sealed class

[Alan Bateman]

On Thu, 20 May 2021 17:14:57 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Conceptually, AccessbileObject is a sealed class with a protected constructor stating
> 
>     Constructor: only used by the Java Virtual Machine.
> 
> With the language now supporting sealed classes, the AccessbileObject should be marked as sealed.
> 
> Executable and Field are the subclasses of AccessbileObject in the JDK; as Executable has subclasses, it is marked as non-sealed.
> 
> Please also review the corresponding CSR:
> 
> https://bugs.openjdk.java.net/browse/JDK-8224243

I think this will require reaching out to Google Guava, I think its their Invocable API that extends AccessibleObject outside of the JDK. We ran this when doing the module system where we didn't initially take into account sub-classes that were outside of java.base.

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PR: https://git.openjdk.java.net/jdk/pull/4133