Produce IANA registered flavor of HAL media type by default.

Fixes GH-2454.

Author: odrotbohm

spring-data-rest-core/src/main/java/org/springframework/data/rest/core/config/RepositoryRestConfiguration.java

@@ -21,13 +21,10 @@
 import java.util.List;
 
 import org.springframework.data.repository.support.Repositories;
-import org.springframework.data.rest.core.annotation.RepositoryRestResource;
-import org.springframework.data.rest.core.annotation.RestResource;
 import org.springframework.data.rest.core.mapping.ExposureConfiguration;
 import org.springframework.data.rest.core.mapping.RepositoryDetectionStrategy;
 import org.springframework.data.rest.core.mapping.RepositoryDetectionStrategy.RepositoryDetectionStrategies;
 import org.springframework.data.rest.core.support.EntityLookup;
-import org.springframework.hateoas.LinkRelation;
 import org.springframework.hateoas.MediaTypes;
 import org.springframework.hateoas.server.LinkRelationProvider;
 import org.springframework.hateoas.server.core.AnnotationLinkRelationProvider;
@@ -57,7 +54,7 @@ public class RepositoryRestConfiguration {
 	private String pageParamName = "page";
 	private String limitParamName = "size";
 	private String sortParamName = "sort";
-	private MediaType defaultMediaType = MediaTypes.HAL_JSON;
+	private MediaType defaultMediaType = MediaTypes.VND_HAL_JSON;
 	private boolean useHalAsDefaultJsonMediaType = true;
 	private Boolean returnBodyOnCreate = null;
 	private Boolean returnBodyOnUpdate = null;

spring-data-rest-hal-explorer/src/test/java/org/springframework/data/rest/webmvc/halexplorer/HalExplorerIntegrationTests.java

@@ -80,7 +80,7 @@ void exposesJsonUnderApiRootByDefault() throws Exception {
 
 		mvc.perform(get(BASE_PATH).accept(MediaType.ALL)).//
 				andExpect(status().isOk()).//
-				andExpect(header().string(HttpHeaders.CONTENT_TYPE, startsWith(MediaTypes.HAL_JSON.toString())));
+				andExpect(header().string(HttpHeaders.CONTENT_TYPE, startsWith(MediaTypes.VND_HAL_JSON.toString())));
 	}
 
 	@Test // DATAREST-293

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.java

@@ -574,8 +574,8 @@ public TypeConstrainedMappingJackson2HttpMessageConverter halJacksonHttpMessageC
 			RepositoryRestConfiguration repositoryRestConfiguration) {
 
 		ArrayList<MediaType> mediaTypes = new ArrayList<>();
-		mediaTypes.add(MediaTypes.HAL_JSON);
 		mediaTypes.add(MediaTypes.VND_HAL_JSON);
+		mediaTypes.add(MediaTypes.HAL_JSON);
 
 		// Enable returning HAL if application/json is asked if it's configured to be the default type
 		if (repositoryRestConfiguration.useHalAsDefaultJsonMediaType()) {