Issue: SPR-12926

Remove unused imports

ByteBufferConverter also defensively returns the rewind result now.

Issue: SPR-13031

Issue: SPR-13024

Provide Converter implementations for Charset, Currency and TimeZone as
related PropertyEditors are available for those.

Issue: SPR-13020

Prior to this commit, the documentation in AnnotationUtils was
inconsistent, and at times even misleading, with regard to finding
annotations that are "present" or "directly present" on annotated
elements.

This commit defines the terminology used within AnnotationUtils and
introduces the explicit notion of "meta-present" to denote that
annotations are present within annotation hierarchies above annotated
elements.

Issue: SPR-13030

This commit updates the "get semantics" search algorithm used in
`AnnotatedElementUtils` so that locally declared 'composed annotations'
are favored over inherited annotations.

Specifically, the internal `searchWithGetSemantics()` method now
searches locally declared annotations before searching inherited
annotations.

All TODOs in `AnnotatedElementUtilsTests` have been completed, and all
ignored tests have been reinstated.

Issue: SPR-11598

Issue: SPR-13016

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)

Issue: SPR-13007

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-12998

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

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

Issue: SPR-12003

Issue: SPR-12009

Issue: SPR-12971

Issue: SPR-12957

Issue: SPR-11514

Issue: SPR-11514

Issue: SPR-11514

Issue: SPR-11514

Issue: SPR-11514

This commit picks up where SPR-11483 left off, with the goal of
eliminating all unnecessary inspection of core JDK annotations in
Spring's annotation search algorithms in AnnotatedElementUtils and
AnnotationMetadataReadingVisitor.

Issue: SPR-12989

 - Methods which search for a specific annotation now properly ensure
   that the sought annotation was actually found.

 - Both the "get" and the "find" search algorithms no longer needlessly
   traverse meta-annotation hierarchies twice.

 - Both the "get" and the "find" search algorithms now properly
   increment the metaDepth when recursively searching within the
   meta-annotation hierarchy.

 - Redesigned getMetaAnnotationTypes() so that it doesn't needlessly
   search irrelevant annotations.

 - Documented and tested hasMetaAnnotationTypes().

 - Documented isAnnotated().

Issue: SPR-11514

Issue: SPR-11514

This commit documents the status quo for the getMetaAnnotationTypes()
method in AnnotatedElementUtils and adds appropriate regression tests to
AnnotatedElementUtilsTests.

In addition, this commit also introduces a SimpleAnnotationProcessor
base class in AnnotatedElementUtils.

Issue: SPR-11514

This commit documents return values throughout AnnotatedElementUtils and
improves the documentation for the internal Processor API.

Issue: SPR-11514

Issue: SPR-12738