RFR: 8371953: Document null handling in core reflection APIs [v2]

[Chen Liang]

On Sun, 16 Nov 2025 15:45:24 GMT, Chen Liang <liach at openjdk.org> wrote:

>> A lot of core reflection APIs are from antique times, which have their own null handling behavior. Such behaviors are often not documented in the specification; we should document rejected null arguments and accepted null arguments (including array elements) explicitly.
>> 
>> In the investigation, I found `Class.isNestmateOf` (inconsistent) and `AnnotatedType`'s implementation of `AnnotatedElement` methods (required by specification) are missing null checks. I consider these unlikely to be a user dependency and added new null checks.
>
> Chen Liang has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - Rephrase for parameterTypes contains null
>  - Rename tests to be more specific
>  - Split annotated type new checks to another patch

I updated the parameterTypes null element behavior for NoSuchMethodException, and made the test names more specific. In addition, I moved my discovered null check issues with AnnotatedType's AnnotatedElement methods to a separate patch, as that has no spec change and is purely behavioral.

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PR Comment: https://git.openjdk.org/jdk/pull/28336#issuecomment-3538890734