Closes gh-14049

* pr/14049:
  Polish

See gh-14049

Unlike Java 8, 9, and 10, Java 11 does not tolerate a null URL being
used to create a URLClassLoader. The Atmosphere sample looks for
a resource named /WEB-INF/classes which only exists in a packaged
war application. In all other cases the resulting URL is null.
Atmosphere uses this to create a URLClassLoader which fails on Java
11.

This commit updates the sample to customize the handlers path. There
are other web application-specific assumptions in Atmosphere, such as
the scanning of WEB-INF/lib by default. This change appears to get
the sample going, but we should, perhaps, consider removing it in the
longer term, particularly as Boot itself has no Atmosphere
integration.

See gh-14028

* gh-14065:
  Polish "Update OIDC configuration"
  Update OIDC config following Spring Security changes

Closes gh-14065

The location changed for the class that provides a ClientRegistration
via an issuer URL, and this updates Spring Boot accordingly.

* gh-14062:
  Exclude protobuf-java from mysql-connector-java

Closes gh-14062

Fixes gh-13955

Due to gradle/gradle#5510, using a lambda for a task action breaks
up-to-date checks in certain circumstances.

This commit updates JavaPluginAction to use an inner-class in place
of a lambda for the action that it adds to JavaCompile tasks. A test
has not been added as it does not appear to be possible to reproduce
it with a TestKit-based test.

Closes gh-14054

See gh-14028

Closes gh-14053

Closes gh-14034

If the web application type is set via properties,
it is available only after binding. The environment needs
to be converted to the appropriate type if it does not match.
If a custom environment is set, it is not converted.

Fixes gh-13977

See gh-13974

See gh-13974

This commit adds support for Spring Framework's `DataSize` allowing to
express a size in bytes and other convenient units.

Similar to the `Duration` support introduced previously, this commit
adds transparent binding support as well as detection of default values
in `@ConfigurationProperties`-annotated object.

Closes gh-13974

The 3.0.1 version of the Maven Javadoc Plugin contains a bug [1] that
means that a link URL must redirect otherwise it is ignored.

[1] https://issues.apache.org/jira/browse/MJAVADOC-532

The -link parameters passed into the javadoc executable are used
as-is. For example, redirects are not followed. Unlike 3.x, 2.x of the
Maven javadoc plugin does not attempt to follow redirects before links
are passed to the javadoc executable. As a result, for external links
to work, the links that we provide must be canonical and produce a
200 response when accessed.

Closes gh-14031

* gh-14032:
  Propagate retryWrites flag from connection URI to ReactiveMongoClient

Closes gh-14032

Closes gh-14011

* pr/14043:
  Add missing @Override

Closes gh-14043

* pr/14046:
  Fix freemarker documentation link