This commit removes OptionalParameter in favor of the nullness support
introduced in Spring Framework 7. The parameter of an action can now
be flagged as optional using JSpecify's @Nullable, and simplifies the
setup for those who are using JSpecify as only a single annotation is
required.
Closes gh-45390
Spring Boot 4 requires Jakarta EE 11. Jersey 4 will support EE 11 but
its release schedule is uncertain. Furthermore, Jersey does not yet
support Jackson 3 and there's no clear timeline for when Jackson 3
will be supported.
In light of the above, this commit removes support for Jersey.
Reinstating support can be considered once there's a Jersey GA that
supports Jakarta EE 11 or its clear that one will be available in
time for Boot's GA in November. Ideally, support for Jackson 3 would
also be available before reinstating Jersey support.
Closes gh-47017
Spring Framework 7.0 requires a Servlet 6.1 baseline for Servlet containers.
Partial Servlet 6.1 support is available on the `main` Undertow branch,
but there isn't any milestone version available for the undertow 2.4
generation. At this stage of our 4.0 schedule, we think it's safer to drop
Undertow support now.
Closes: gh-46917
Stéphane Nicoll
Andy Wilkinson
Phillip Webb
Brian Clozel
Moritz Halbritter