Fix handling of annotations on super classes in AnnotationsPropertySource

Closes gh-6006

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/properties/AnnotationsPropertySource.java

@@ -87,13 +87,24 @@ public class AnnotationsPropertySource extends EnumerablePropertySource<Class<?>
 		List<Annotation> mergedAnnotations = new ArrayList<Annotation>();
 		for (Annotation annotation : AnnotationUtils.getAnnotations(source)) {
 			if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)) {
-				mergedAnnotations.add(AnnotatedElementUtils.getMergedAnnotation(root,
+				mergedAnnotations
-						annotation.annotationType()));
+						.add(findMergedAnnotation(root, annotation.annotationType()));
 			}
 		}
 		return mergedAnnotations;
 	}
 
+	private Annotation findMergedAnnotation(Class<?> source,
+			Class<? extends Annotation> annotationType) {
+		if (source == null) {
+			return null;
+		}
+		Annotation mergedAnnotation = AnnotatedElementUtils.getMergedAnnotation(source,
+				annotationType);
+		return mergedAnnotation != null ? mergedAnnotation
+				: findMergedAnnotation(source.getSuperclass(), annotationType);
+	}
+
 	private void collectProperties(Annotation annotation, Method attribute,
 			PropertyMapping typeMapping, Map<String, Object> properties) {
 		PropertyMapping attributeMapping = AnnotationUtils.getAnnotation(attribute,

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/properties/AnnotationsPropertySourceTests.java

@@ -169,6 +169,22 @@ public class AnnotationsPropertySourceTests {
 		new AnnotationsPropertySource(PropertyMappedWithSelfAnnotatingAnnotation.class);
 	}
 
+	@Test
+	public void typeLevelAnnotationOnSuperClass() {
+		AnnotationsPropertySource source = new AnnotationsPropertySource(
+				PropertyMappedAnnotationOnSuperClass.class);
+		assertThat(source.getPropertyNames()).containsExactly("value");
+		assertThat(source.getProperty("value")).isEqualTo("abc");
+	}
+
+	@Test
+	public void aliasedPropertyMappedAttributeOnSuperClass() {
+		AnnotationsPropertySource source = new AnnotationsPropertySource(
+				AliasedPropertyMappedAnnotationOnSuperClass.class);
+		assertThat(source.getPropertyNames()).containsExactly("aliasing.value");
+		assertThat(source.getProperty("aliasing.value")).isEqualTo("baz");
+	}
+
 	static class NoAnnotation {
 
 	}
@@ -359,4 +375,13 @@ public class AnnotationsPropertySourceTests {
 
 	}
 
+	static class PropertyMappedAnnotationOnSuperClass extends TypeLevel {
+
+	}
+
+	static class AliasedPropertyMappedAnnotationOnSuperClass
+			extends PropertyMappedAttributeWithAnAlias {
+
+	}
+
 }