Closes gh-24657

* pr/24606:
  Polish "Return -1 port for non-listening WebServers"
  Return -1 port for non-listening WebServers

Closes gh-24606

See gh-24606

Update `WebServer` implementations to return -1 from `getPort()` if
the server  isn't listening on a port. This aligns the implementations
with the interface Javadoc.

See gh-24606

Closes gh-24654

Update `OperationMethodParameter` to additionally support JSR-305 based
`@Nullable` annotations.

Closes gh-24647

Prior to this commit, the configtree property source would not traverse
into a sub-directory in a property path if the sub-directory was a
symbolic link. This commit allows symlinked sub-directories to be
traversed like any other sub-directory in the property path.

Fixes gh-24530

Closes gh-24584

Closes gh-24649

* gh-24648:
  Exclude starters from Javadoc aggregation

Closes gh-24648

See gh-24648

Closes gh-24643

* pr/24628:
  Polish "Remove unnecessary semicolon"
  Remove unnecessary semicolon

Closes gh-24628

See gh-24628

See gh-24628

The fix causes a Jersey application to fail in the absence
of a `CorsFilter` or `CorsConfigurationSource` bean.

See gh-11987

See gh-24597

* pr/24629:
  Polish "Make a field final"
  Make a field final

Closes gh-24629

See gh-24629

See gh-24629

Closes gh-24626

* pr/24625:
  Update copyrights to 2021

Closes gh-24625

See gh-24625

* pr/24604:
  Polish

Closes gh-24604

See gh-24604

See gh-24604

Closes gh-24602

Closes gh-24599

Closes gh-24576

* pr/24597:
  Polish "Handle missing manifest files in JarTypeFilter"
  Handle missing manifest files in JarTypeFilter

Closes gh-24597

See gh-24597

This commit makes sure that a jar file without a manifest is handled
properly (i.e. included in the repackaged archive).

See gh-24597

Closes gh-24596