Remove the extra 's' from the class name

Minor polish to formatting and assertion messages.

Issue: SPR-10587

Effectively rename HttpHeaders.getIfNotModifiedSince() to
getIfModifiedSince() by adding a new method and deprecating the
old one.

Issue: SPR-10600

Refine the SQL statements contained in exceptions thrown from batch
updates based on BatchUpdateException.getUpdateCounts().

Issue: SPR-10677

Update the reference guide jdbcTemplate update example to include the
column name.

Issue: SPR-10625

Ensure any exception from calls to batchUpdate, on databases that
support batch operations, contains all the SQL statements. Prior to this
commit only the last SQL statement would be returned with the exception.

Issue: SPR-10677

A new type MessageHeaderAccesssor provides read/write access to
MessageHeaders along with typed getter/setter methods along the lines
of the existing MessageBuilder methods (internally MessageBuilder
merely delegates to MessageHeaderAccessor). This class is extensible
with sub-classes expected to provide typed getter/setter methods for
specific categories of message headers.

NativeMessageHeaderAccessor is one specific sub-class that further
provides read/write access to headers from some external message
source (e.g. STOMP headers). Native headers are stored in a separate
MultiValueMap and kept under a specific key.

# By Nick Williams
* SPR-10644:
  Improving method validation support for BV 1.1

Update MethodValidationPostProcessor.setValidator(...) to use
LocalValidatorFactoryBean.getValidator() when possible.

This is required because LocalValidatorFactoryBean does not directly
implement the forExecutables() method introduced in bean validation v1.1.

Issue: SPR-10644

Update the cached MethodExecutor in MethodReference to include the
method argument types. Prevents the incorrect use of the cache when the
SpEL expression refers to a class that has overloaded methods.

Issue: SPR-10657

Ensure RmiInvocationWrapperRTD.xml is packaged inside spring-context.jar

Issue: SPR-10649

Allow the @CachePut 'key' SpEL to refer to the result of the method call
via a '#result' variable.

This change is particularly useful when working with JPA entities that
have generated @Id values since the ID will often not be available
until the entity has been saved.

Issue: SPR-10664

Polish cache abstraction code and refactor CacheAspectSupport.

Introduce new SimpleKeyGenerator class to supersede DefaultKeyGenerator.
Unlike DefaultKeyGenerator, no collisions will occur with the keys
generated by SimpleKeyGenerator as the full parameter values are
considered within the SimpleKey.equals(...) method.

The SimpleKeyGenerator is now the default class used when no explicit
generator is configured.

Issue: SPR-10237

Update queryForObject calls in the JDBC reference documentation to
use 'Integer.class' rather than the unsupported 'int.class'.

Issue: SPR-10651

Update BeanFactory.getBeansWithAnnotation() to skip any abstract
bean definitions.

Issue: SPR-10663

Add EnhancedConfigurationBeanPostProcessor to inject the BeanFactory
into EnhancedConfiguration classes before the
AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues method
is called.

Prior to this commit it was possible for @Autowire in a @Configuration
class to invoke an enhanced configuration class method before the
BeanFactory was injected. This is due to the fact that the
AutowiredAnnotationBeanPostProcessor was called before
AbstractAutowireCapableBeanFactory.invokeAwareMethods().

Issue: SPR-10668

Issue: SPR-10519

Issue: SPR-10603

Issue: SPR-10390

Issue: SPR-10041, SPR-10652

Add 'mvc:' namespace prefix to 'mapping' and 'exclude-mapping' elements
in the reference documentation.

Issue: SPR-10670

SPR-10402 in Spring Framework 3.2.3 treated empty request parameter
values as missing values, if the empty value was turned into a null
by a PropertyEditor or Converter. This caused the regression.

Issue: SPR-10578, SPR-10402, SPR-10584

Similar to @ExceptionHandler but for message processing. Such a method
can send messages to both the message broker channel and the client
channel provided the client is subscribed to the target destination.

The "system" STOMP session is established at startup and can be used
to send messages without a client session, e.g. to support broadcasting
from a REST/HTTP handler method.

MessageHolder holds the currently processed message in a ThreadLocal,
which allows PubSubMessageBuilder to automatically add a session id
to messages to be sent.

Rename to PubSubHeaderAccessor and StompHeaderAccessor
Move the renamed classes to support packages

Remove fromPayloadAndHeaders from MessageBuilder, just use
withPayload(..).copyHeaders(..) instead.

The use of an AtomicBoolean and no lock meant that it was possible
for a message to be queued and then never be flushed and sent to the
broker:

1. On t1, a message is received and isConnected is false. The message
   will be queued.
2. On t2, CONNECTED is received from the broker. isConnected is set
   to true, the queue is drained and the queued messages are forwarded
3. On t1, the message is added to the queue

To fix this, checking that isConnected is false (step 1 above) and the
queueing of a message (step 3 above) need to be performed as a unit
so that the flushing of the queued messages can't be interleaved. This
is achieved by synchronizing on a monitor and performing steps 1
and 3 and synchronizing on the same monitor while performing step 2.

The monitor is held while the messages are actually being forwarded
to the broker. An alternative would be to drain the queue into
a local variable, release the monitor, and then forward the messages.
The main advantage of this alternative is that the monitor is held for
less time. It also reduces the theoretical risk of deadlock by not
holding the monitor while making an alien call. The downside of the
alternative is that it may lead to messages being forwarded out of
order. For this reason the alternative approach was rejected.