Previously, ErrorPageFilter set the value of
javax.servlet.error.exception_type to be the name of the exception,
(a java.lang.String). This commit changes it to be a java.lang.Class
as required by the Servlet spec.

Closes gh-7925

Previously, OAuth2MethodSecurityConfiguration set the
PermissionEvaluator on the expression evaluator by looking in the
context for a PermissionEvaluator bean. This is unnecessary as
GlobalMethodSecurityConfiguration already does the same thing and does
so after the post-processor in OAuth2MethodSecurityConfiguration has
run. This commit removes the redundant logic and adds tests to check
that both the PermissionEvaluator and the RoleHierarchy are set use
beans in the context.

Closes gh-7979

Closes gh-7864

* pr/7911:
  Fix configure a datasource reference doc link

Closes gh-7911

* gh-7937:
  Update springloaded version to 1.2.6.RELEASE in Maven-related docs

Closes gh-7937

* gh-7937:
  Update springloaded version to 1.2.6.RELEASE in Gradle-related docs

Closes gh-7937

* pr/7907:
  Fix incomplete assertions

Closes gh-7907

Closes gh-7903

Closes gh-7880

Remove the spring-core dependency from the annotation processor.
(cherry-picked from 4cb7d86a)

Fixes gh-7882

Update `ManagementContextConfigurationsImportSelector` to instantiate
classes so that order annotations are respected.

Fixes gh-7814

Update `TestRestTemplate` to handle `BasicAuthorizationInterceptor`s
correctly. Prior to this commit the `BasicAuthorizationInterceptor`
was added directly to the `ClientHttpRequestFactory` rather than
to the `RestTemplate`. This meant that it could not easily be removed
when `TestRestTemplate.withBasicAuth` was invoked.

The `TestRestTemplate` now sets the interceptor on `RestTemplate`
directly and relies on the logic in `InterceptingHttpAccessor` to
add it to the `ClientHttpRequestFactory`.

Fixes gh-7812

See gh-7793

Update `CacheManagerCustomizers` to deal directly with
`ClassCastException` assuming that they are because a customizer is
implemented using a lambda.

Closes gh-7788

Closes gh-7781

Update ClassLoaderFilesResourcePatternResolver to support servlet
resources when it's being used with a WebApplicationContext.

Prior to commit 918e122d a `ResourceLoader` was not added to the
`ApplicationContext`, meaning that servlet resources could be found by
virtue of the protected `getResourceByPath()` method. Following commit
918e122d, the context `ResourceLoader` is set, meaning that all calls
to `getResource` delegate to the `ResourceLoader` and the
`ApplicationContext` methods are not invoked. Since the devtools
`ResourceLoader` wasn't Servlet aware, servlet resources could not
be found.

Fixes gh-7752

Closes gh-7771

* pr/7741:
  Notify BuildContext of changed build-info file

Update Maven plugin to inform the BuildContext when changes are made to
the `build-info` file. Prior to this commit Eclipse could continually
trigger refreshes whenever "Refresh using native hooks or polling" was
enabled and the file was written to `src/main/resources`.

Closes gh-7741

* pr/7737:
  Improve Cassandra sample README documentation

Update the README file in `spring-boot-sample-data-cassandra` with
details of how to setup the keyspace and create the tables.

Closes gh-7737

* pr/7769:
  Fix typo in "you IDE"

Change "you IDE" to "your IDE".

Closes gh-7769

Add a simple test to show that basic serving of `/public` resources
works with devtoos.

See gh-7752

* pr/7765:
  Changed "right the way" to "right away"

Closes gh-7765

This commit aligns the mapping from library to name to the default
behaviour of the `maven-war-plugin`. Previously, our plugin would use
the full version of the library (i.e. including build timestamp if there
is one), rather than using the `baseVersion` property.

Closes gh-7743

* pr/7755:
  Minor fix in description

Closes gh-7755

Closes gh-7742

Closes gh-7721