RFR: JDK-8306819: Consider disabling the compiler's default active annotation processing

[Joe Darcy]

On Sun, 10 Sep 2023 22:57:30 GMT, Rob Bygrave <duke at openjdk.org> wrote:

> > This patch isn't aimed to remove AP. This aims to avoid unintentional AP pollutions in classpath
> 
> Yes, I understand that.
> 
> > Such classpath separation have already been promoted by build tools like Gradle.
> 
> **_BUT_** it has **_NOT_** been promoted by **_Maven_**. In the bug report and in this PR I do not see any explicit recognition of how this change will impact the community that is using Maven and I am suggesting that this is a significant proportion of the community.
> 
> For example, all the libraries that use annotation processing that document maven use could be impacted along the lines that their documentation will now be at least misleading (and sometimes incorrect).
> 
> This change might indeed be a good long term change but it seems to be being made without any recognition or understanding of how impactful it will be.

Maven is listed as a participant in the OpenJDK Quality Outreach effort (https://wiki.openjdk.org/display/quality/Quality+Outreach).

The prior change of the javac emitting the note was explicitly raised on the quality discuss alias in July 2023 (https://mail.openjdk.org/pipermail/quality-discuss/2023-July/thread.html), ahead of the GA of JDK 21 in September.

The change in this PR is likewise publicized this the October 2023 quality discuss message (https://mail.openjdk.org/pipermail/quality-discuss/2023-October/001129.html), months ahead of the expected GA of JDK 23 in March 2024.

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PR Comment: https://git.openjdk.org/jdk/pull/14432#issuecomment-1773592750