Issue: SPR-12223

Optimize ReflectionUtils.isCglibRenamedMethod by removing the regular
expression.

Issue: SPR-12227

Update SystemEnvironmentPropertySource to attempt optimized Map lookups
first, and only fall-back to the defensive SecurityManager safe-mode
if these fail.

Issue: SPR-12224

SystemEnvironmentPropertySource uses regular property names check instead of optimized Map lookup (for defensiveness in SecurityManager scenarios)

Issue: SPR-12224

Issue: SPR-12223

The WebSocket messaging namespace now exposes configuration options for
custom argument resolvers and return value handlers.

Issue: SPR-12217

This change defers determination of whether to invoke a message
converter in case of a null @ResponseBody value (or ResponseEntity with
a null body) until after the invocation of the ResponseBodyAdvice
chain. This allows a ResponseBodyAdvice to handle null values
potentially turning them into non-null value.s

Issue: SPR-12152

This change extends the "websocket" scope to ApplicationContext events
published from StompSubProtocolHandler. This however will only work
with ApplicationEventMulticaster that multicasts events in the same
thread.

Issue: SPR-12172

Refine property source ordering so that sources already contained in the
environment remain before those added by @PropertySource annotations.

Issue: SPR-12198

Improve the performance of MapPropertySource by directly implementing
the containsProperty property.

Issue: SPR-12224

Update JndiLocatorDelegate.isDefaultJndiEnvironmentAvailable() to
call `getEnvironment()` on the `InitialContext` in order to actually
trigger a NamingException if JNDI is not available.

Issue: SPR-12223

Issue: SPR-12198
(cherry picked from commit 205e6812)

Issue: SPR-12187
(cherry picked from commit 29abca53)

Issue: SPR-12198

Issue: SPR-12187

SessionDisconnectEvent now extends AbstractSubProtocolEvent.

Issue: SPR-12156

Issue: SPR-12215

Issue: SPR-12186

Update ConditionEvaluator to collect then sort Conditions before
evaluation. By annotating Conditions with @Ordered expensive operations
can be pushed to the back of the queue.

Issue: SPR-12219

Scheduled/JmsListenerAnnotationBeanPostProcessor avoids needless re-scanning of non-annotated classes

Issue: SPR-12189

Issue: SPR-12177

Issue: SPR-12167

Issue: SPR-12161

Issue: SPR-12185

Issue: SPR-12185

ConfigurationClassParser avoids double registration of nested classes which extend their containing class

Issue: SPR-12195

Issue: SPR-12196

Issue: SPR-12196

Issue: SPR-12185

Issue: SPR-12181