RFR: CODETOOLS-7903008: JMH: Support incremental annotation processing for Gradle Java plugin

[Taylor Wicksell]

On Tue, 30 Nov 2021 10:38:05 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>>> Please hold off on merging. After running through some more complex benchmark examples, I've found a place where we are not using Filer to write classes. `StateObjectHandler.writeStateOverrides` seems problematic. Looking to see if I can fix that.
>> 
>> I don't see a problem there? `StateObjectHandler.writeStateOverrides` delegates to `GeneratorDestination.newClass`, which in calls `APGeneratorDestination.newClass` in annotation processing mode, which uses `Filer`.
>
>> Sorry to be a bother, but would you mind having another look at this one @shipilev?
> 
> Hi! Sorry for delay. This looks marginally okay, although I was getting a bit nervous about implementing new stuff to support (unsupported) Gradle builds. But I think this is okay. 
> 
> Now that it affects core code, we have to figure out a bit of testing. Please merge from the `master`, and see if https://github.com/twicksell/jmh/actions have workflows enabled for this PR. Those should be green.

Thanks @shipilev. I've updated my PR to bring it up to date with master. It looks like I need some kind of approval for the github action to run. As for the test plan, I'm open to anything you'd like to see. Really appreciate your help in getting this merged, even though Gradle is not explicitly supported.

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PR: https://git.openjdk.java.net/jmh/pull/43