This commit improves the documentation for AnnotationUtils and
AnnotatedElementUtils by explaining that the scope of most annotation
searches is limited to finding the first such annotation, resulting in
additional such annotations being silently ignored.

Issue: SPR-13015

(cherry picked from commit 9e925aa8)

(cherry picked from commit a8f75399)

Spring Framework's build is using a custom MergePlugin in order to merge
a project into another one and share/override configuration and
dependencies.

Prior to this commit, two projects merged into a third one could trigger
dependency conflicts when exporting the project definition into a POM.
When trying to define the scope for a given dependency, those two
projects would compete for this with the same priority, resulting in a
Gradle exception.

One could trigger this issue by running:

    ./gradlew :spring-orm:install -x javadoc

Because `spring-orm-hibernate4` and `spring-orm-hibernate5` get merged
into `spring-orm` and both define optional/test dependencies to
spring-mvc, etc.

This commit makes sure that two projects, when defining dependency
scopes, don't use the same priority value; the MergePlugin now adds the
index of the current subproject to the priority value. So when two
projects compete for this, the one defined in last will define the
dependency scope.

Issue: SPR-13013

Issue: SPR-13010

Issue: SPR-13007

* SPR-13007:
  Avoid eager formatting in pre-condition checks

In general, the Spring Framework aims to construct error message
strings only if an actual error has occurred. This seems to be the
common pattern in the codebase and saves both CPU and memory. However,
there are some places where eager error message formatting occurs
unnecessarily.

This commit addresses this issue in the following classes:
AdviceModeImportSelector, AnnotationAttributes, and
ReadOnlySystemAttributesMap.

The change in ReadOnlySystemAttributesMap also avoids a potential
NullPointerException.

Issue: SPR-13007

Issue: SPR-13005

This commit introduces support in the spring-test module for obtaining a
reference to the underlying target object hidden behind one or more
proxies.

Specifically this commit introduces AopTestUtils with two methods:

 - getTargetObject(Object)

 - getUltimateTargetObject(Object)

Issue: SPR-13005

Issue: SPR-11694

Issue: SPR-11694

Issue: SPR-11694

Issue: SPR-12998

Modify to use the ConfigurableApplicationContext in reference document

Issue: SPR-13000

This commit also completes 4.2 schema variants in spring-context.

Issue: SPR-5215

Commit 5648fbfc introduced a
compile-time dependency on spring-beans-groovy in the spring-context
module which breaks the build on the CI server since the Animal Sniffer
task cannot find a JAR file for spring-beans-groovy.

This commit reverts that change so that the "sniffer" task once again
succeeds.

Prior to this commit, the `getAnnotation()` method in `TypeDescriptor`
only supported a single level of meta-annotations. In other words, the
annotation hierarchy would not be exhaustively searched.

This commit provides support for arbitrary levels of meta-annotations
in `TypeDescriptor` by delegating to `AnnotationUtils.findAnnotation()`
within `TypeDescriptor.getAnnotation()`.

Issue: SPR-12793

Issue: SPR-12998

* SPR-12975:
  Remove duplicate separators when combining paths

Prior to this commit, AntPathMatcher would not correctly combine a path
that ends with a separator with a path that starts with a separator.
For example, `/foo/` + `/bar` combined into `/foo//bar`.

Specifically, this commit:

 - Removes the duplicated separator in combined paths

 - Improves RequestMappingInfo's toString() representation

 - Fixes Javadoc formatting in AntPathMatcher

 - Polishes AntPathMatcherTests

 - Polishes Javadoc in AbstractRequestCondition

Issue: SPR-12975

Latest dependency updates (EhCache 2.10, Jackson 2.5.3, JasperReports 6.0.4, SLF4J 1.7.12, Tomcat 8.0.22, Undertow 1.2.5)

Issue: SPR-11807

This commit introduces a messaging.converter.MessageConverter that
marshals to/from XML using the abstractions provided in the OXM module.

Issue: SPR-12726

Issue: SPR-12617

Issue: SPR-12003

Issue: SPR-12009

Issue: SPR-12971