* pr/10367:
  Polish "Clean up Java 6 leftover"
  Clean up Java 6 leftover

Closes gh-10367

See gh-10367

Closes gh-9948

* pr/8342:
  Polish "Add actuator endpoint for finding and deleting sessions"
  Add actuator endpoint for finding and deleting sessions

Closes gh-8342

See gh-8342

Closes gh-9966

* gh-9839:
  Polish "Use -parameters compiler arg by default in Gradle builds"
  Use -parameters compiler arg by default in Gradle builds

Closes gh-9839

See gh-9839

See gh-9969

* pr/10350:
  Polish "Remove usage of `HttpStatus` in Web Endpoints"
  Remove usage of `HttpStatus` in Web Endpoints

Closes gh-10350

See gh-10350

* pr/10351:
  Polish "Improve Spring Session sample"
  Improve Spring Session sample

Closes gh-10351

This commit improves the Spring Session sample by providing multiple
build profiles that make it possible to easily try out different session
stores. By default, JDBC session store backed by an in-memory embedded H2
database is used.

See gh-10351

Closes gh-10245

Closes gh-10247

Surefire 2.20 is completely silent when running in quiet mode which
causes Travis to incorrectly detect that the build has hung. This
commit removes the use of quiet mode in the hope that it will
strike a reasonable balance between enough log output to prevent
a false positive for the build being hung while also not generating
so much output that Travis cannot cope.

* gh-10278:
  Polish "Align prefix match in BufferCounterService with DefaultCounterService"
  Align prefix match in BufferCounterService with DefaultCounterService

See gh-10278

Closes gh-10278

* gh-10355:
  Upgrade Git Maven plugin to 2.2.3

Closes gh-10355

Closes gh-10353

Fixes gh-10106

Closes gh-9414

Closes gh-10113

In Java 9, a package may return null for its implementation version
even when the manifest attribute specifying the version is present
in the jar from which the package was loaded.

This commit updates DependencyManagementPluginAction to fall back to
accessing the jar and its manifest attributes directly when the
implementation version of its package is null.

Closes gh-10049

Hibernate Validator 6 has a slightly different structure for default
messages. This commit adapts our tests accordingly.

See gh-9969

See gh-9969

This should have been done in par with #9969

Closes gh-9784

Closes gh-10336

* pr/9969:
  Upgrade to Hibernate Validator 6.0.2.Final

Closes gh-9969

* pr/10045:
  Add dependency management for tomcat-catalina-jmx-remote