Before this commit those were burried in the Appendix where few would
guess to look. Previously that information was at the top, so it makes
sense to point to the Github wiki from the index HTML page.
Also a general update of the index page. Since we have recently revised
the overview, we can simply point to it and keep it shorter.
The section listing now includes more details per section.
Before this commit WebClient documentation was also included from the
Integration section where the RestTemplate is documented. That is
convenient but results in duplicate content under different URLs.
This commit removes the include from the Integration section and leaves
Extract WebClient content into a separate file that is now included
both in the WebFlux and in the Integration sections.
This allows having RestTemplate and WebClient documented in one place
under Integration while also keeping the same included in the WebFlux
section too.
This commit introduces the following changes.
1) It adds a new Spring @NonNull annotation which allows to apply
@NonNullApi semantic on a specific element, like @Nullable does.
Combined with @Nullable, it allows partial null-safety support when
package granularity is too broad.
2) @Nullable and @NonNull can apply to ElementType.TYPE_USE in order
to be used on generic type arguments (SPR-15942).
3) Annotations does not apply to ElementType.TYPE_PARAMETER anymore
since it is not supported yet (applicability for such use case is
controversial and need to be discussed).
4) @NonNullApi does not apply to ElementType.FIELD anymore since in a
lot of use cases (private, protected) it is not part for the public API
+ its usage should remain opt-in. A dedicated @NonNullFields annotation
has been added in order to set fields default to non-nullable.
5) Updated Javadoc and reference documentation.
Issue: SPR-15756
Rossen Stoyanchev
Sebastien Deleuze
Sam Brannen
Stephane Nicoll
David Harrigan
Nikola Kolosnjaji
Jussi Hallila
Juergen Hoeller
Arjen Poutsma