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
Moritz Halbritter
Andy Wilkinson
Stéphane Nicoll
Phillip Webb