Issue: SPR-13992

Issue: SPR-13992

Issue: SPR-13992

Issue: SPR-13992

This commit picks up where 8ff9e818
left off.

Specifically, this commit introduces support that allows a single
element attribute to override an array attribute with a matching
component type when synthesizing annotations (e.g., in annotations
synthesized from attributes that have been merged from the annotation
hierarchy above a composed annotation).

Issue: SPR-13972

Add period unit in the description so that it shows up in the summary
description.

* pr/985:
  Add table title for @Transactional settings

Closes gh-985

The MVC config now plugs the configured ContentNegotiationManager into
resource request handling.

Issue: SPR-13658

The ResourceHttpRequestHandler now relies on the conifgured
ContentNegotiationManager to determine the content type for resource
requests rather than implementing that internally.

First we check against the matched resource based on the resource file
extension. Then we expand the check against the request with any
configured content negotiation strategy.

Issue: SPR-13658

Issue: SPR-14018

This commit updates the WEBJARS_LOCATION in WebJarResourceResolver to
avoid getting duplicate slashes in resolved resources locations such
as `/webjars//bootstrap/3.3.2/js/bootstrap.min.js`.

Issue: SPR-14018

The DefaulUriTemplateHandler now provides a strictEncoding property
which if turned on encodes everything outside the reserved char set.

This is in contrast to the default policy of encoding only illegal
charaters depending on the URI component type.

Issue: SPR-11652

This commit adds a newline char at the beginning of textarea tags
values. As per the HTML 4.01 spec (and browsers behavior), a line break
following a start tag is ignored.

This can lead to Spring's textarea tag to ignore a line break char at
the beginning of a tag value.

See https://www.w3.org/TR/html401/appendix/notes.html#notes-line-breaks

Issue: SPR-13503

Issue: SPR-13614

Issue: SPR-13614

This commit changes the visibility of the getTestContext() method in
TestContextManager from 'protected' to 'public' in order to support
test method injection in JUnit 5 and similar use cases.

Issue: SPR-14011

Prior to this change, SPR-13867 made sure that any class extending
WebContentGenerator would not overwrite existing HTTP "Cache-Control"
response headers - set by a filter, a Controller handler, etc.

This caused issues with resource handling, since specifying a cache
configuration there would not overwrite default headers set by filters,
for example by Spring Security.

This commit restricts the previous changes to the
RequestMappingHandlerAdapter, in order to avoid overwriting header set
by a filter or a Controller handler in those cases.

Issue: SPR-14005

This commit demonstrates how to register one or more @Configuration
classes via an ApplicationContextInitializer in a composed annotation so
that certain @Configuration classes are always registered whenever the
composed annotation is used, even if the composed annotation is used to
declare additional @Configuration classes.

The new Filter is simply a new way of packaging the ability to extract
X-Forwarded-* headers already available via UriComponentsBuilder.

The Filter wraps the request and the effect is that anything using the
request will see the original schem, host, and port.

Issue: SPR-13614

Issue: SPR-13975

Issue: SPR-13978

Prior to this commit, `ServletWebRequest.checkNotModified` would only
support conditional GET/HEAD requests with "If-Modified-Since" and/or
"If-None-Match" request headers. In those cases, the server would return
"HTTP 304 Not Modified" responses if the resource didn't change.

This commit adds support for conditional update requests, such as
POST/PUT/DELETE requests with "If-Unmodified-Since" request headers.
If the underlying resource has been modified since the specified date,
the server will return a "409 Precondition failed" response status
to prevent concurrent updates.

Even if the modification status of the resource is reversed here
(modified vs. not modified), we're keeping here the same intent for the
return value, which signals if the response requires more processing or
if the handler method can return immediately:

```
if (request.checkNotModified(lastModified)) {
  // shortcut exit - no further processing necessary
  return null;
}
```

Issue: SPR-13863

Issue: SPR-14004

Before this commit, specifying the charset to use with produces or
consumes @RequestMapping attributes resulted in default charset
loss. That was really annoying for JSON for example, where using
UTF-8 charset is mandatory in a lot of use cases.

This commit adds a defaultCharset property to
AbstractHttpMessageConverter in order to avoid losing the
default charset when specifying the charset with these
@RequestMapping attributes.

It changes slightly the default behavior (that's why we have waited
4.3), but it is much more error prone, and will match with most
user's expectations since the charset loss was accidental in most
use cases (users usually just want to limit the media type supported
by a specific handler method).

Issue: SPR-13631

* SPR-13992:
  Introduce composed annotations for @RequestMapping

This commit introduces the following common composed annotations for
@RequestMapping in Spring MVC and Spring MVC REST.

- @GetMapping
- @PostMapping
- @PutMapping
- @DeleteMapping
- @PatchMapping

Issue: SPR-13992

This commit adds an annotation that should be used to mark any usage of
the `sun.misc` API.

* SPR-13993:
  Introduce composed annotations for web scopes

This commit introduces the following common composed annotations for
web scopes.

- @RequestScope
- @SessionScope
- @ApplicationScope

Issue: SPR-13993

Prior to this commit, the TransactionalTestExecutionListener required
@Transactional test methods to be public; however, neither TestNG nor
JUnit 5 require that @test methods are public. Consequently, non-public
transactional test methods silently run *without* a transaction.

This commit removes the 'public' restriction on transactional test
methods by setting the 'publicMethodsOnly' flag in
AnnotationTransactionAttributeSource to false.

Issue: SPR-14000