* pr/8536:
  Polish "Add slice test annotation for LDAP"
  Add slice test annotation for LDAP

Closes gh-8536

This commit adds new annotation `@DataLdapTest` which provides test
infrastructure for LDAP. By default, embedded ldap server is initialized
if available.

See gh-8536

* pr/8889:
  Upgrade to Apache Maven 3.5.0

Closes gh-8889

This commit renames the `solrStatus` property of the Solr health indicator
to `status` and its type. This is now an integer corresponding to the
status Solr sent rather than a String that can be "OK" when all is well.

Closes gh-8878

Since SPR-15415 and SPR-15435, the HandlerStrategies and its companion
builder are now using the new CodecConfigurer infrastructure to
configure codecs in a cross-cutting way.

This commit looks for a custom instance of `HandlerStrategies.Builder`
provided by the user, or create a default one if none was found.

Fixes gh-8897

Closes gh-8895

* pr/8128:
  Polish "Handle null value in OnExpressionCondition"
  Handle null value in OnExpressionCondition

Closes gh-8128

Closes gh-2886

* pr/8768:
  Polish "Use JDK hashCode() variants for primitives"
  Use JDK hashCode() variants for primitives

Closes gh-8768

See gh-8768

Closes gh-8892

This commit improves `SpringApplicationAdminMXBeanRegistrar` so that it
work with traditional Servlet-based app but also with Spring WebFlux.

Closes gh-8533

Closes gh-8232

Closes gh-8885

Closes gh-6911

This commit makes sure to honour the `spring.aop.proxy-target-class`
property if set by the user. Previously, the
`PersistenceExceptionTranslationPostProcessor` was always configured to
use cglib, regardless of the value of that property.

Closes gh-8887

Closes gh-8497

This commit separates the JPA-specific bits of the batch
auto-configuration so that it is possible to reuse most of the logic if
JPA isn't available at all.

Closes gh-8877