Issue: SPR-14420

Issue: SPR-14410

Issue: SPR-14321

Issue: SPR-14415

Originally handleNoMatch looked for partial matches based on URL
pattern, HTTP method, consumes, produces, and params in that order
but without narrowing down the set of partial matches resulting in
potentially inaccruate response status codes

Commit 473de0 added an improvement to narrow the set with partial
matches for URL pattern and HTTP method matches.

This commit overhauls handleNoMatch so that the narrowing down of
matches happens at each stage resulting in more accurate error
reporting for request mappings with fine-grained conditions.

Issue: SPR-14397

This commit fixes MessagingMessageConverter to no longer expose the lazy
message resolution algorithm. This restores proper behaviour for
converters used outside of that context.

Instead, such arrangement is now private to
AbstractAdaptableMessageListener (as it should).

Issue: SPR-14389

Issue: SPR-14370

Issue: SPR-14413

Issue: SPR-14412

The `CacheResolver` and `ErrorHandler` features introduced in 4.1 were
not properly enabled in AspectJ mode. This commit adds more tests from
the regular proxy-based mode and align the AspectJ caching configuration.

Issue: SPR-14413

This commit adds a `ClientHttpRequestInterceptor` that applies a BASIC
authorization header for each request.

It can be used as follows:

```
BasicAuthorizationInterceptor basicAuthorization =
    new BasicAuthorizationInterceptor("user", "secret");
restTemplate.getInterceptors().add(basicAuthorization);
```

Issue: SPR-14412

* pr/1092:
  Fix typo in asciidoc

Closes gh-1092

Issue: SPR-14391

Issue: SPR-14405

As of 4.3 ResourceHttpRequestHandler delegates to the configured
ContentNegotiationManager, or one created internally, to look up
the media type for are resource.

This commit ensures the internally created ContentNegotiationManager is
correctly injected with the ServletContext through which it can perform
lookups as before.

Also the ServletPathContentNegotiationStrategy now checks the
ServletContext first and then delegates to its parent the
PathContentNegotiationStrategy and not vice versa. This is
consistent with how handleNoMatch (also in the same class) works
and also matches how ResourceHttpRequestHandler worked before 4.3.

Issue: SPR-14368

Issue: SPR-14321

This commit sets the response content type to
"text/event-stream;charset=UTF-8". Even if the SSE spec says that the
encoding should always be UTF-8 and that specifying the charset is
optional, we're setting it in all cases, since some containers might use
the default encoding "ISO-8859-1" and confuse HTTP clients.

Issue: SPR-14407

Issue: SPR-14406

Issue: SPR-14385

Issue: SPR-14400

Issue: SPR-14399

Issue: SPR-14393

HibernateJpaVendorAdapter and LocalSessionFactoryBuilder enforce Hibernate 5.2's connection handling mode DELAYED_ACQUISITION_AND_HOLD

Issue: SPR-14393

Issue: SPR-14393

Issue: SPR-14394

This commit updates AbstractHandlerExceptionResolver to only log at the
WARN level exceptions that are actually resolved by the
ExceptionResolver.

In case developers wish to log each time an ExceptionResolver is called,
a DEBUG level log is still available.

Issue: SPR-14392

Issue: SPR-14367

Prior to this commit, any attempt to include a bean of type
ServletServerContainerFactoryBean in the WebApplicationContext for an
integration test class annotated with @WebAppConfiguration in
conjunction the Spring TestContext Framework (TCF) would have resulted
in an IllegalStateException stating that "A ServletContext is required
to access the javax.websocket.server.ServerContainer instance."

In such scenarios, the MockServletContext was in fact present in the
WebApplicationContext; however there was no WebSocket ServerContainer
stored in the ServletContext.

This commit addresses this issue by introducing the following.

- MockServerContainer: a private mock implementation of the
  javax.websocket.server.ServerContainer interface.

- MockServerContainerContextCustomizer: a ContextCustomizer that
  instantiates a new MockServerContainer and stores it in the
  ServletContext under the attribute named
  "javax.websocket.server.ServerContainer".

- MockServerContainerContextCustomizerFactory: a
  ContextCustomizerFactory which creates a
  MockServerContainerContextCustomizer if WebSocket support is present
  in the classpath and the test class is annotated with
  @WebAppConfiguration. This factory is registered by default via the
  spring.factories mechanism.

Issue: SPR-14367

Issue: SPR-14367

Issue: SPR-14388

Issue: SPR-14373

Issue: SPR-14328