Issue: SPR-14832

Includes consistent use of ResolvableType.resolve() wherever applicable.

Issue: SPR-15011

Issue: SPR-14725

Improve RootBeanDefinition to specify an AnnotatedElement that holds
qualifier information. When such element is present, any qualifier that
it defines will be used to find a matching candidate.

Issue: SPR-14725

Issue: SPR-14580

Issue: SPR-13188

This commit also removes support code for outdated options which were only available in older schema versions.

Issue: SPR-13499

Issue: SPR-13188

This allows us to avoid early initialization of footprint-heavy ConcurrentHashMaps, and reuses the existing postProcessingLock which will typically be active already when registerExternallyManaged* calls come in from the bean factory's post-processing phase.

Issue: SPR-11343

Also optimized getTypeForFactoryMethod's implementation for non-generic factory methods, and reduced calls to getResolvedFactoryMethod in order to avoid repeated synchronization.

Issue: SPR-11034

Issue: SPR-10374

Issue: SPR-10130

Following the introduction of spring-beans-4.0.xsd and the corresponding removal of the pre-2.0 spring-beans.dtd.

Issue: SPR-10437

Use JDK 1.6's Collections.newSetFromMap instead of manually accessing Maps with dummy Boolean values

Issue: SPR-10335

This reverts commit 45fa5082, reversing
changes made to a312d900.

Issue: SPR-10130

Fix serialization warnings by applying @SuppressWarnings("serial")
when appropriate.

In certain cases and for unknown reasons, a correctly-placed
@SuppressWarnings("serial") annotation will fix the warning at the
javac level (i.e. the Gradle command-line), but will produce an
"unnecessary @SuppressWarnings" warning within Eclipse. In these
cases, a private static final serialVersionUID field has been added
with the default value of 1L.

Issue: SPR-10128

In particular, avoiding synchronized Sets and Maps wherever possible (preferring a ConcurrentHashMap even instead of a synchronized Set) and specifying appropriate ConcurrentHashMap initial capacities (even if we end up choosing 16).

Issue: SPR-8956

This renaming more intuitively expresses the relationship between
subprojects and the JAR artifacts they produce.

Tracking history across these renames is possible, but it requires
use of the --follow flag to `git log`, for example

    $ git log spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history up until the renaming event, where

    $ git log --follow spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history for all changes to the file, before and after the
renaming.

See http://chrisbeams.com/git-diff-across-renamed-directories

revised constructor argument caching for highly concurrent creation scenarios (follow-up to SPR-7423)

AbstractInterceptorDrivenBeanDefinitionDecorator exposes decorated BeanDefinition for early type checking in AbstractBeanFactory (SPR-7006)

revised support for annotated factory methods (merged @FactoryMethod functionality into JavaConfig facility)