DATAREST-957 - Improved PUT handling for transient properties not backed by a field.

When copying the transient properties of an aggregate, we now try field based access first and fall back to accessor based copying in case both a setter and getter are exposed on the type.

Previously we always expected a field to be present which doesn't necessarily has to be the case.

Related ticket: DATAREST-986.

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/json/DomainObjectReaderUnitTests.java

@@ -92,6 +92,7 @@ public class DomainObjectReaderUnitTests {
 		mappingContext.getPersistentEntity(Outer.class);
 		mappingContext.getPersistentEntity(Parent.class);
 		mappingContext.getPersistentEntity(Product.class);
+		mappingContext.getPersistentEntity(TransientReadOnlyProperty.class);
 		mappingContext.afterPropertiesSet();
 
 		PersistentEntities entities = new PersistentEntities(Collections.singleton(mappingContext));
@@ -441,6 +442,15 @@ public class DomainObjectReaderUnitTests {
 		assertThat(result.map.get(Locale.GERMAN), is(new LocalizedValue("schlussendlich")));
 	}
 
+	@Test // DATAREST-987
+	public void handlesTransientPropertyWithoutFieldProperly() throws Exception {
+
+		ObjectMapper mapper = new ObjectMapper();
+		JsonNode node = mapper.readTree("{ \"name\" : \"Foo\" }");
+
+		reader.readPut((ObjectNode) node, new TransientReadOnlyProperty(), mapper);
+	}
+
 	@SuppressWarnings("unchecked")
 	private static <T> T as(Object source, Class<T> type) {
 
@@ -564,4 +574,15 @@ public class DomainObjectReaderUnitTests {
 	static class LocalizedValue {
 		String value;
 	}
+
+	@JsonAutoDetect(getterVisibility = Visibility.ANY)
+	static class TransientReadOnlyProperty {
+
+		@Transient
+		public String getName() {
+			return null;
+		}
+
+		public void setName(String name) {}
+	}
 }