This commit makes several improvements to MultiValueMap:
- asSingleValueMap offers a single-value view (as opposed to the
existing toSingleValueMap, which offers a copy)
- fromSingleValue is a static method that adapts a Map<?,?> to the
MultiValueMap interface
- fromMultiValue is a static method that adapts a Map<?,List<?>> to the
MultiValueMap interface
Closes gh-32832
Prior to this commit, `@ExceptionHandler` annotated controller methods
could be mapped using the exception type declaration as an annotation
attribute, or as a method parameter.
While such methods support a wide variety of method arguments and return
types, it was not possible to declare the same exception type on
different methods (in the same controller/controller advice).
This commit adds a new `produces` attribute on `@ExceptionHandler`; with
that, applications can vary the HTTP response depending on the exception
type and the requested content-type by the client:
```
@ExceptionHandler(produces = "application/json")
public ResponseEntity<ErrorMessage> handleJson(IllegalArgumentException exc) {
return ResponseEntity.badRequest().body(new ErrorMessage(exc.getMessage(), 42));
}
@ExceptionHandler(produces = "text/html")
public String handle(IllegalArgumentException exc, Model model) {
model.addAttribute("error", new ErrorMessage(exc.getMessage(), 42));
return "errorView";
}
```
This commit implements support in both Spring MVC and Spring WebFlux.
Closes gh-31936
Prior to this commit, the `ReactiveTypeHandler` would handle `Flux`-like
return types from controller methods and adapt them to SSE streams using
the `SseEmitter`/`ResponseBodyEmitter` APIs. In case an `IOException` is
thrown while writing to the HTTP response stream, the
`ReactiveTypeHandler` would rely on the Servlet container to call
`AsyncListener#onError` - this would be the signal for Spring MVC to
complete the async exchange. To prevent racing issues between this
signal and the actual handling of the exception, changes like gh-20173
were applied. Since then, robust checks were added with gh-32340 in
`StandardServletAsyncWebRequest.LifecycleHttpServletResponse`.
With Jetty 12, `AsyncListener#onError` would not be called as the error
would happen while writing in blocking mode to the response (so, not
using the Servlet WriteListener contract). But still, such `IOException`
would still result in the closing of the HTTP connection. As of Jetty
12.0.4, this is no longer the case and the party managing the async
lifecycle is in charge of completing the exchange, as it should. This
means that the current behavior leaks HTTP connections for these cases
and causes memory issues.
This commit ensures that such exceptions happening during response
writes are caught and result in the completion of the `SSEEmitter` and
the closing of the exchange. Even if other Servlet containers still
propagate the error `AsyncListener#onError`, competing signals are still
managed with gh-32340.
Closes gh-32629
This commit ensures that a copy is made of old attributes before
replacing it with new attributes. Because new attributes can be
composed of old, clearing the old would also remove entries from the
new.
See gh-32245
This is equivalent of the same contract for WebFlux. It is implemented
by HandlerMappingIntrospector, and may be called directly by Spring
Security to handle a pre-flight request without delegate to the rest
of the filter chain.
HandlerMappingIntrospector also has the boolean method
allHandlerMappingsUsePathPatternParser that checks whether all handler
mappings are configured to use parsed PathPattern's.
See gh-31823
Previously, a UriComponents build based on a method would require the
given method to be the annotated one as method parameter resolution only
applied locally. This was a problem when a controller was specified on
a method whose mapping is defined in a parent.
This commit harmonies the lookup using AnnotatedMethod who provides
support for a synthesized method parameter that takes annotations from
parent parameter into account.
Closes gh-32553
This commit introduces support for org.webjars:webjars-locator-lite
via a new LiteWebJarsResourceResolver in Spring MVC and WebFlux, and
deprecates WebJarsResourceResolver which is performing a classpath
scanning that slows down application startup.
Closes gh-27619
This commit ensures pathExtension predicate is skipped when the value
is null, in order to provide a more predictable behavior, and allow
a better compatibility with collections not supporting null elements
like the ones created by List#of.
Closes gh-32404
This commit adds support for application/yaml in MediaType and leverages
jackson-dataformat-yaml in order to support Yaml in RestTemplate,
RestClient and Spring MVC.
See gh-32345
Arjen Poutsma
Stéphane Nicoll
Sam Brannen
Brian Clozel
rstoyanchev
Juergen Hoeller
Yanming Zhou
Sébastien Deleuze
Arjen Poutsma
ameinema
Johnny Lim
Brian Clozel
Hyoungjune