AbstractAutoProxyCreator and AbstractAdvisingBeanPostProcessor consistently not considering configuration callbacks and internal language interfaces as reasonable proxy interfaces

Issue: SPR-11715

AbstractAdvisingBeanPostProcessor uses target class check for existing proxy but checks against actual exposed object otherwise (catching introductions)

Issue: SPR-11725

Issue: SPR-11618

Issue: SPR-11416

Issue: SPR-11398

Issue: SPR-11107

Fix remaining Java compiler warnings, mainly around missing
generics or deprecated code.

Also add the `-Werror` compiler option to ensure that any future
warnings will fail the build.

Issue: SPR-11064

Issue: SPR-10430

Extended DefaultAopProxyFactory to create Objenesis based proxies if the
library is on the classpath. This allows classes without a default
constructor being CGLib proxied. We're now falling back to original CGLib
based behavior in case the proxy creation using Objenesis fails.

Objenesis 2.0 is now inlined into spring-core to avoid interfering with
other Objenesis versions on the classpath.

Issue: SPR-10594

Port the latest unreleased UndeclaredThrowableStrategy implementation
from cglib to fix a memory-leak present in v3.

Issue: SPR-10709

Issue: SPR-10130

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

Just AsyncAnnotationBeanPostProcessor switches "beforeExistingAdvisors" to "true" by default. So effectively, MethodValidation/PersistenceExceptionTranslationPostProcessor apply after existing advisors by default again, fixing the 3.1->3.2 regression.

Issue: SPR-10309

Minor formatting polish across that codebase. Primarily fixing
whitespace issues.

Issue: SPR-10144

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

Issue: SPR-10127

  find . -type f -name "*.java" -or -name "*.aj" | \
    xargs perl -p -i -e "s/[ \t]*$//g" {} \;

Issue: SPR-10127

Issue: SPR-10108

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).

DefaultSingletonBeanRegistry avoids singletonObjects lock wherever possible for non-singleton factory performance

Issue: SPR-9819

Throw an AopInvocationException when an AOP advisor returns null on
a method that should return a primitive type.

Issue: SPR-4675

 - Allow reset of GlobalAdvisorAdapterRegistry

   Provide a reset() method allowing the GlobalAdvisorAdapterRegistry
   instance to be replaced with a fresh instance. This method has
   primarily been added to allow unit tests to leave the registry
   in a known state.

 - Protect against the fact that calls to configuration class methods
   my occur in a random order.

Issue: SPR-9779

CGLIB 3 has been released in order to depend on ASM 4, which Spring now
depends on internally (see previous commit).

This commit eliminates spring-beans' optional dependency on cglib-nodep
v2.2 and instead repackages net.sf.cglib => org.springframework.cglib
much in the same way we have historically done with ASM.

This change is beneficial to users in several ways:

 - Eliminates the need to manually add CGLIB to the application
   classpath; especially important for the growing number of
   @Configuration class users. Java-based configuration functionality,
   along with proxy-target-class and method injection features now
   work 'out of the box' in Spring 3.2.

 - Eliminates the possibility of conflicts with other libraries that
   may dependend on differing versions of CGLIB, e.g. Hibernate
   3.3.1.ga and its dependency on CGLIB 2.1.3 would easily cause a
   conflict if the application were depending on CGLIB 3 for
   Spring-related purposes.

 - Picks up CGLIB 3's changes to support ASM 4, meaning that CGLIB is
   that much less likely to work well in a Java 7 environment due to
   ASM 4's support for transforming classes with invokedynamic
   bytecode instructions.

On CGLIB and ASM:

  CGLIB's own dependency on ASM is also transformed along the way to
  depend on Spring's repackaged org.springframework.asm, primarily to
  eliminate unnecessary duplication of ASM classfiles in spring-core and
  in the process save around 100K in the final spring-core JAR file size.

  It is coincidental that spring-core and CGLIB currently depend on the
  exact same version of ASM (4.0), but it is also unlikely to change any
  time soon. If this change does occur and versions of ASM drift, then
  the size optimization mentioned above will have to be abandoned. This
  would have no compatibility impact, however, so this is a reasonable
  solution now and for the forseeable future.

On a mysterious NoClassDefFoundError:

  During the upgrade to CGLIB 3.0, Spring test cases began failing due to
  NoClassDefFoundErrors being thrown from CGLIB's DebuggingClassWriter
  regarding its use of asm-util's TraceClassVisitor type. previous
  versions of cglib-nodep, particularly 2.2, did not cause this behavior,
  even though cglib-nodep has never actually repackaged and bundled
  asm-util classes. The reason for these NoClassDefFoundErrors occurring
  now is still not fully understood, but appears to be due to subtle JVM
  bytecode preverification rules. The hypothesis is that due to minor
  changes in DebuggingClassWriter such as additional casts, access to
  instance variables declared in the superclass, and indeed a change in
  the superclass hierarchy, preverification may be kicking in on the
  toByteArray method body, at which point the reference to the missing
  TraceClassVisitor type is noticed and the NCDFE is thrown. For this
  reason, a dummy implementation of TraceClassVisitor has been added to
  spring-core in the org.springframework.asm.util package. This class
  simply ensures that Spring's own tests never result in the NCDFE
  described above, and more importantly that Spring's users never
  encounter the same.

Other changes include:

 - rename package-private Cglib2AopProxy => CglibAopProxy
 - eliminate all 'cglibAvailable' checks, warnings and errors
 - eliminate all 'CGLIB2' language in favor of 'CGLIB'
 - eliminate all mention in reference and java docs of needing to add
   cglib(-nodep) to one's application classpath

Issue: SPR-9669

This patch fixes several compiler warnings that do not point to code
problems. Two kinds of warnings are fixed. First in a lot of cases
@SuppressWarnings("unchecked") is used although there are no unchecked
casts happening. This seems to be a leftover from when the code base
was on Java 1.4, now that the code base was moved to Java 1.5 these are
no longer necessary. Secondly there some places where the raw types of
List and Class are used where there wildcard types (List<?> and
Class<?>) would work just as well without causing any raw type warnings.

These changes are beneficial particularly when working in Eclipse or
other IDEs because it reduces 'noise', helping to isolate actual
potential problems in the code.

The following changes have been made:

 - remove @SuppressWarnings where no longer needed

 - use wildcard types instead of raw types where possible

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