#784 - Introduce UBER+JSON mediatype.

src/main/java/org/springframework/hateoas/MediaTypes.java

@@ -76,4 +76,14 @@ public class MediaTypes {
 	 * Public constant media type for {@code application/vnd.collection+json}.
 	 */
 	public static final MediaType COLLECTION_JSON = MediaType.valueOf(COLLECTION_JSON_VALUE);
+
+	/**
+	 * A String equivalent of {@link MediaTypes#UBER_JSON_VALUE}.
+	 */
+	public static final String UBER_JSON_VALUE = "application/vnd.amundsen-uber+json";
+
+	/**
+	 * Public constant media type for {@code application/vnd.amundsen-uber+json}.
+	 */
+	public static final MediaType UBER_JSON = MediaType.parseMediaType(UBER_JSON_VALUE);
 }

src/main/java/org/springframework/hateoas/ResourceSupport.java

@@ -55,7 +55,9 @@ public Optional<Link> getId() {
 	 * @param link
 	 */
 	public void add(Link link) {
+
 		Assert.notNull(link, "Link must not be null!");
+
 		this.links.add(link);
 	}
 
@@ -65,7 +67,9 @@ public void add(Link link) {
 	 * @param links
 	 */
 	public void add(Iterable<Link> links) {
+
 		Assert.notNull(links, "Given links must not be null!");
+
 		links.forEach(this::add);
 	}
 
@@ -75,7 +79,9 @@ public void add(Iterable<Link> links) {
 	 * @param links must not be {@literal null}.
 	 */
 	public void add(Link... links) {
+
 		Assert.notNull(links, "Given links must not be null!");
+
 		add(Arrays.asList(links));
 	}
 

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

@@ -43,6 +43,8 @@
 import org.springframework.hateoas.hal.forms.Jackson2HalFormsModule;
 import org.springframework.hateoas.hal.forms.Jackson2HalFormsModule.HalFormsHandlerInstantiator;
 import org.springframework.hateoas.mvc.TypeConstrainedMappingJackson2HttpMessageConverter;
+import org.springframework.hateoas.uber.Jackson2UberModule;
+import org.springframework.hateoas.uber.Jackson2UberModule.UberHandlerInstantiator;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
@@ -96,7 +98,7 @@ public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
 		if (converters.stream()
 			.filter(MappingJackson2HttpMessageConverter.class::isInstance)
 			.map(AbstractJackson2HttpMessageConverter.class::cast)
-			.map(converter -> converter.getObjectMapper())
+			.map(AbstractJackson2HttpMessageConverter::getObjectMapper)
 			.anyMatch(Jackson2HalModule::isAlreadyRegisteredIn)) {
 
 			return;
@@ -124,8 +126,29 @@ public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
 		if (hypermediaTypes.contains(HypermediaType.COLLECTION_JSON)) {
 			converters.add(0, createCollectionJsonConverter(objectMapper, linkRelationMessageSource));
 		}
+
+		if (hypermediaTypes.contains(HypermediaType.UBER)) {
+			converters.add(0, createUberJsonConverter(objectMapper));
+		}
 	}
 
+	/**
+	 * @param objectMapper
+	 * @return
+	 */
+	protected MappingJackson2HttpMessageConverter createUberJsonConverter(ObjectMapper objectMapper) {
+
+		ObjectMapper mapper = objectMapper.copy();
+
+		mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
+		mapper.registerModule(new Jackson2UberModule());
+		mapper.setHandlerInstantiator(new UberHandlerInstantiator());
+
+		return new TypeConstrainedMappingJackson2HttpMessageConverter(
+			ResourceSupport.class, Arrays.asList(UBER_JSON), mapper);
+	}
+
+
 	/**
 	 * @param objectMapper
 	 * @param linkRelationMessageSource

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

@@ -86,7 +86,14 @@ enum HypermediaType {
 		 *
 		 * @see http://amundsen.com/media-types/collection/format/
 		 */
-		COLLECTION_JSON;
+		COLLECTION_JSON,
+
+		/**
+		 * UBER Hypermedia
+		 *
+		 * @see http://uberhypermedia.org/
+		 */
+		UBER;
 
 		private static Set<HypermediaType> HAL_BASED_MEDIATYPES = EnumSet.of(HAL, HAL_FORMS);
 

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

@@ -37,6 +37,7 @@
 import org.springframework.hateoas.config.EnableHypermediaSupport.HypermediaType;
 import org.springframework.hateoas.hal.HalLinkDiscoverer;
 import org.springframework.hateoas.hal.forms.HalFormsLinkDiscoverer;
+import org.springframework.hateoas.uber.UberLinkDiscoverer;
 import org.springframework.util.ClassUtils;
 
 /**
@@ -96,6 +97,9 @@ private AbstractBeanDefinition getLinkDiscovererBeanDefinition(HypermediaType ty
 			case COLLECTION_JSON:
 				definition = new RootBeanDefinition(CollectionJsonLinkDiscoverer.class);
 				break;
+			case UBER:
+				definition = new RootBeanDefinition(UberLinkDiscoverer.class);
+				break;
 			default:
 				throw new IllegalStateException(String.format("Unsupported hypermedia type %s!", type));
 		}

src/main/java/org/springframework/hateoas/support/JacksonHelper.java

@@ -15,6 +15,9 @@
  */
 package org.springframework.hateoas.support;
 
+import org.springframework.hateoas.Resource;
+import org.springframework.hateoas.Resources;
+
 import com.fasterxml.jackson.databind.JavaType;
 
 /**
@@ -36,4 +39,18 @@ public static JavaType findRootType(JavaType contentType) {
 			return contentType;
 		}
 	}
+
+	/**
+	 * Is this a {@literal Resources<Resource<?>>}?
+	 * 
+	 * @param type
+	 * @return
+	 */
+	public static boolean isResourcesOfResource(JavaType type) {
+
+		return
+			Resources.class.isAssignableFrom(type.getRawClass())
+			&&
+			Resource.class.isAssignableFrom(type.containedType(0).getRawClass());
+	}
 }

src/main/java/org/springframework/hateoas/support/PropertyUtils.java

@@ -61,7 +61,9 @@ public static Map<String, Object> findProperties(Object object) {
 			.collect(HashMap::new,
 				(hashMap, descriptor) -> {
 					try {
-						hashMap.put(descriptor.getName(), descriptor.getReadMethod().invoke(object));
+						Method readMethod = descriptor.getReadMethod();
+						ReflectionUtils.makeAccessible(readMethod);
+						hashMap.put(descriptor.getName(), readMethod.invoke(object));
 					} catch (IllegalAccessException | InvocationTargetException e) {
 						throw new RuntimeException(e);
 					}
@@ -85,9 +87,9 @@ public static List<String> findPropertyNames(Class<?> clazz) {
 			.collect(Collectors.toList());
 	}
 
-	public static Object createObjectFromProperties(Class<?> clazz, Map<String, Object> properties) {
+	public static <T> T createObjectFromProperties(Class<T> clazz, Map<String, Object> properties) {
 
-		Object obj = BeanUtils.instantiateClass(clazz);
+		T obj = BeanUtils.instantiateClass(clazz);
 
 		properties.forEach((key, value) -> {
 			Optional<PropertyDescriptor> possibleProperty = Optional.ofNullable(BeanUtils.getPropertyDescriptor(clazz, key));