While I cannot comment on Tomcat 11 requirements and Java 21 is
unavoidable I'd like to comment on this because I consider it wrong:
We could switch all branches to Java 17 as the the default build JRE now
as that supports targeting Java 7 onwards. That would allow us to easily
use some newer Java features in Tomcat 11 whilst still only requiring
RMs to use a single JDK version. If there are no objections I'll do this
shortly.
This will basically kill Tomcat 9.x and 10.x for those who:
* Want/need to build from source
* Run tests in their setup
* Provide fixes/patches
where Java 17 is not available for them, e.g. commercial Unix or any
other circumstance (company policy, etc.). I already dislike the move
done with Spring Framework 6/Boot 3, this just cuts off a tremendous
user base.
For as long as 8/11 [1] receive support I wouldn't do this step at all.
I'd take the baseline the Java EE version requires.
Michael
[1] https://endoflife.date/java
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