Closes gh-21634

Previously, if the Spring Boot build plugins got a connection error
when attempting to communicate with a Docker daemon (for example,
when the daemon isn't running), the error message made it appear that
the daemon returned an HTTP error code. This commit makes a connection
error distinct from an HTTP error response code to make it easier for
the user to diagnose the root cause of the problem.

Fixes gh-21554

Closes gh-21598

Closes gh-21597

Update `YamlJsonParser` and `OriginTrackedYamlLoader` to ensure that
custom types cannot be loaded.

Closes gh-21596

Closes gh-21594

Closes gh-21593

Previously, the files were extracted on the fly and written into the
jars. This didn't work well with Gradle's up-to-date checks as the
inputs of the jar task were not well-defined.

This commit moves the extraction of the notice and license files into
a separate task, the outputs of which are then copied into the jar's
META-INF.

Closes gh-21592

Previously, an AvailabilityChangeEvent was published when the servlet
and reactive web server application contexts were closed, irrespective
of whether or not the context was active. This caused problems when
the context was not active due to a refresh failure as the event
publication could then trigger bean creation and post-processing that
relied upon beans that had been destroyed when cleaning up after the
refresh failure. The most commonly seen symptom was a missing
importRegistry bean that is required by ImportAwareBeanPostProcessor.

This commit updates the two web server application contexts to only
publish the availability change event if the context is active.

Fixes gh-21588

Kafka 2.5 no longer provides artifacts for Scala 2.11

Closes gh-21589

This commit polishes the assertions of the NoSuchMethodError failure
analyzer as the method format changes according to the JDK.

See gh-21587

* pr/21581:
  Upgrade to Testcontainers 1.14.2

Closes gh-21581

See gh-21581

Closes gh-21574

Closes gh-21587

* pr/21579:
  Polish "Polish duration support javadoc"
  Polish duration support javadoc

Closes gh-21579

See gh-21579

See gh-21579

This commit restores RestClientBuilderCustomizer in the rest package in
a deprecated fashion so that the upgrade from 2.2 is smoother.

Closes gh-21572

Previously, the productionRuntimeClasspath configuration was created
without any attributes. This caused problems with multi-project
dependency resolution as there was insufficient information for Gradle
to determine which variant of a dependency should be used by the
productionRuntimeClasspath configuration.

This commit updates the configuration to have three attributes, each
configured with the same values as those of Gradle's own
runtimeClasspathConfiguration.

Fixes gh-21549

Closes gh-21440

Closes gh-21563

* pr/21540:
  Fix links for Apache Camel starter

Closes gh-21540

See gh-21540

* pr/21492:
  Fix default value for spring.data.jpa.repositories.bootstrap-mode

Closes gh-21492

See gh-21492

Closes gh-21562

* pr/21480:
  Polish "Use the container IP address for tests using TestContainer"
  Use the container IP address for tests using TestContainer

Closes gh-21480

See gh-21480

See gh-21480

Closes gh-21560

See gh-21392

* pr/21392:
  Fix uri tag for empty path

Closes gh-21392

See gh-21392

This commit mentions the `management.health.probes.enabled`
configuration property in the Kubernetes Probes section of the Actuator
chapter.

Enabling this property is required if we need to expose Kubernetes
Probes in a non-Kubernetes environment.

Fixes gh-21505

Prior to this commit, Spring Boot would auto-configure Spring MVC and
would keep the default `UrlPathHelper` configuration.
Since Spring Boot is in charge of configuring the `DispatcherServlet`
and its mapping, it is in a position to optimally configure the
`UrlPathHelper` depending on the chosen mapping.

This commit sets the `alwaysUseFullPath` property of `UrlPathHelper` if
the Servlet mapping is `"/"`. This is more efficient since this
configuration requires less processing of the request path.

Closes gh-21499

This commit adds the support for static and templated welcome pages with
Spring WebFlux. The implementation is backed by a `RouterFunction`
that's serving a static `index.html` file or rendering an `index` view.

Closes gh-9785