Prior to this commit, one couldn't configure Jackson's ObjectMapper
with (De)SerializerModifiers or advanced configuration features
using XML configuration.

This commit updates the FactoryBean and adds a setModule method
that will register Modules with the ObjectMapper.

Note that this commit is only about XML configuration, since
this feature was already available with JavaConfig.

Issue: SPR-10429

Prior to this commit, Multipart databinding would only support
MultiPartFile databinding using commons-multipart.

Now the WebRequestDataBinder supports Part and List<Part>
databinding for Servlet 3.0 compliant containers.

Issue: SPR-10591

Issue: SPR-10539

Prior to this commit, RestTemplate would not would
not accept IPv6 raw addresses in URLs because UriComponentsBuilder
would not parse/encode the Host part correctly.

The UriComponentsBuilder now parses and encode raw IPv6 addresses
in the "[1abc:2abc:3abc::5ABC:6abc]" format and also supports the
use of IPv6 scope_ids (see JDK8 java.net.Inet6Address),
like "[1abc:2abc:3abc::5ABC:6abc%eth0]".

Issue: SPR-10539

Added extension to Future with capabilities for registering callbacks
when the future is complete.

- Added ListenableFuture, ListenableFutureCallback,
  ListenableFutureCallbackRegistry, and ListenableFutureTask.
- Using ListenableFuture in AsyncRestOperations/AsyncRestTemplate.
- Added AsyncListenableTaskExecutor, implemented in
  SimpleAsyncTaskExecutor.
- Added FutureAdapter and ListenableFutureAdapter.

Changed return values of Future<Void> to Future<?> in AsyncRestTemplate
and AsyncRestOperations.

Issue: SPR-8804

Restoring consistency with AnnotationConfigApplicationContext.

Issue: SPR-10852

Previously the method signatures for includes and isCompatibleWith were
incompatible with Spring 3.2.x since the argument was now MimeType.
This caused NoSuchMethodError to be thrown when a class was compiled
against MediaType from Spring 3.2.x and ran against MediaType
from Spring 4.x.

This commit restores the signatures and implements each method by
invoking the super class method.

Issue: SPR-10860

Added AsyncRestTemplate, the asynchronous counterpart to the
RestTemplate that was introduced in Spring 3. All methods on the
AsyncRestTemplate are similar to those found on the synchronous
RestTemplatem, except that they return Future wrappers instead of
concrete results.

To enable this, this commit introduces the AsyncClientHttpRequest and
AsyncClientHttpRequestFactory, similar to the ClientHttpRequest and
ClientHttpRequestFactory, except that ClientHttpRequest returns a
Future<ClientHttpResponse> for the execute method. Two implementations
of these interfaces are provided, one based on the HttpURLConnection
incombination with a Spring AsyncTaskExecutor and one based on Apache
HttpComponents HttpAsyncClient.

Issue: SPR-8804

ResourceHttpMessageConverter tries to use the filename to determine the
media type, but for Resource implementations such as ByteArrayResource
it is null, which causes NullPointerException. The fix checks whether
getFilename returns null before attempting to determine the media type
by it.

Issue: SPR-10848

Issue: SPR-10810

Issue: SPR-10647

Issue: SPR-8738

Although ServletHttpRequest provides access to Cookies, other
implementations may not. At the moment this was only needed
for SockJS to check the value of the JSESSIONID cookie. This
is now down by parsing the raw cookie values locally.

If comprehensive cookie support is to be added, we should
probably consider HttpHeaders as a potential candidate.

Issue: SPR-10463

Update methods available on WebSocketSession interface.
Introduce DelegatingWebSocketSession interface.

Introduced  DefaultParameterNameDiscoverer which checks JDK 8's standard reflection first and then falls back to ASM-based debug symbol analysis

Also, StandardReflectionParameterNameDiscoverer calls "Parameter.isNamePresent()" now to return null (and pass on to the next discoverer) if no JDK 8 parameters are available. Note that this requires OpenJDK 8 b100 or higher to compile now.

Issue: SPR-10532

Issue: SPR-10817

This change enables having @ResponseBody on the type-level in which
case it inherited and does not need to be added on the method level.

For added convenience, there is also a new @RestController annotation,
a meta-annotation in turn annotated with @Controller and @ResponseBody.
Classes with the new annotation do not need to have @ResponseBody
declared on the method level as it is inherited.

Issue: SPR-10814

MimeType is available in core-spring and does not include support
for quality parameters and media used in HTTP content negotiation.
The MediaType sub-class in org.springframework.http adds q-parameters.

Disable by default external entity resolution when using Spring OXM
with jaxb. This prevents a XML entity from being able to resolve a
local file on the host system.

See:
https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing

Issue: SPR-10806

This commit polishes the Javadoc and assertion failure messages for
AbstractContextLoaderInitializer and its subclasses.

Issue: SPR-10713

Issue: SPR-10648

Add a factory method in ServerHttpRequest for creating a
ServerHttpAsyncRequestControl.

See javadoc in SockJsService for details.

Also remove ReadOnlyMultiValueMap, CollectionUtils has a method for
that already.

The method returning query parameters now returns only query string
parameters as opposed to any Servlet request parameter.

This commit also adds a ReadOnlyMultiValueMap.

ServerHttpAsyncResponseControl wraps a ServetHttpRequest and -Response
pair and allows putting the processing of the request in async mode
so that the response remains open until explicitly closed, either from
the current or from another thread.

ServletServerHttpAsyncResponseControl provides a Serlvet-based
implementation.

A getCookies method is now available on ServerHttpRequest with one
ServletServerCookie implementation that wraps a Servlet cookie.

The SockJS service makes use of this to check for an existing session
cookie in the request.

Issue: SPR-10413

Issue: SPR-10752
Issue: SPR-10627
(cherry picked from commit ae0f23e9)

Issue: SPR-10591

Issue: SPR-10779