#1061 - Reenable default codecs for WebFlux configuration.

With Spring WebFlux properly handling custom codecs, no need to disable the default handlers.

This commit verifies WebFlux configuration in test cases, and also adds an equivalent set of test cases verifying Web MVC configuration as well.

Supercedes: #1047

Author: gregturn

src/main/java/org/springframework/hateoas/config/WebFluxHateoasConfiguration.java

@@ -124,21 +124,14 @@ static class HypermediaWebFluxConfigurer implements WebFluxConfigurer {
 		@Override
 		public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
 
-			CodecConfigurer.CustomCodecs customCodecs = configurer.customCodecs();
-
 			this.hypermediaTypes.forEach(hypermedia -> {
 
-				MimeType[] mimeTypes = hypermedia.getMediaTypes().toArray(new MimeType[0]);
-
 				ObjectMapper objectMapper = hypermedia.configureObjectMapper(this.mapper.copy());
-				customCodecs.encoder(new Jackson2JsonEncoder(objectMapper, mimeTypes));
-				customCodecs.decoder(new Jackson2JsonDecoder(objectMapper, mimeTypes));
+				MimeType[] mimeTypes = hypermedia.getMediaTypes().toArray(new MimeType[0]);
+				
+				configurer.customCodecs().encoder(new Jackson2JsonEncoder(objectMapper, mimeTypes));
+				configurer.customCodecs().decoder(new Jackson2JsonDecoder(objectMapper, mimeTypes));
 			});
-
-			customCodecs.encoder(CharSequenceEncoder.allMimeTypes());
-			customCodecs.decoder(StringDecoder.allMimeTypes());
-
-			configurer.registerDefaults(false);
 		}
 	}
 }

src/main/java/org/springframework/hateoas/mediatype/collectionjson/Jackson2CollectionJsonModule.java

@@ -65,7 +65,7 @@
  * @author Greg Turnquist
  * @author Oliver Drotbohm
  */
-class Jackson2CollectionJsonModule extends SimpleModule {
+public class Jackson2CollectionJsonModule extends SimpleModule {
 
 	private static final long serialVersionUID = -6540574644565592709L;
 

src/main/java/org/springframework/hateoas/mediatype/hal/forms/Jackson2HalFormsModule.java

@@ -73,7 +73,7 @@
  * @author Greg Turnquist
  * @author Oliver Gierke
  */
-class Jackson2HalFormsModule extends SimpleModule {
+public class Jackson2HalFormsModule extends SimpleModule {
 
 	private static final long serialVersionUID = -4496351128468451196L;
 

src/test/java/org/springframework/hateoas/config/HypermediaWebFluxConfigurerTest.java

@@ -255,15 +255,22 @@ void registeringAllHypermediaTypesShouldAllowCreatingThroughAllFormats() {
 	}
 
 	/**
+	 * When requesting an unregistered media type, fallback to Spring Framework's default JSON handler.
+	 *
 	 * @see #728
 	 */
 	@Test
-	void callingForUnregisteredMediaTypeShouldFail() {
+	void callingForUnregisteredMediaTypeShouldFallBackToDefaultHandler() {
 
 		setUp(HalWebFluxConfig.class);
 
-		this.testClient.get().uri("/").accept(MediaTypes.UBER_JSON).exchange().expectStatus().is4xxClientError()
-				.returnResult(String.class).getResponseBody().as(StepVerifier::create).verifyComplete();
+		this.testClient.get().uri("/").accept(MediaTypes.UBER_JSON) //
+				.exchange() //
+				.expectStatus().isOk() //
+				.returnResult(String.class).getResponseBody() //
+				.as(StepVerifier::create) //
+				.expectNext("{\"links\":[{\"rel\":\"self\",\"href\":\"/\"},{\"rel\":\"employees\",\"href\":\"/employees\"}]}")
+				.verifyComplete();
 	}
 
 	/**