Merge pull request #9914 from Dennis Kieselhorst

* gh-9914:
  Avoid NPE in AnnotationsPropertySource if getAnnotations returns null
  Polish "Avoid NPE in PropertyMappingContextCustomizer"
  Avoid NPE in PropertyMappingContextCustomizer

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

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -85,10 +85,13 @@ public class AnnotationsPropertySource extends EnumerablePropertySource<Class<?>
 
 	private List<Annotation> getMergedAnnotations(Class<?> root, Class<?> source) {
 		List<Annotation> mergedAnnotations = new ArrayList<Annotation>();
-		for (Annotation annotation : AnnotationUtils.getAnnotations(source)) {
-			if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)) {
-				mergedAnnotations
-						.add(findMergedAnnotation(root, annotation.annotationType()));
+		Annotation[] annotations = AnnotationUtils.getAnnotations(source);
+		if (annotations != null) {
+			for (Annotation annotation : annotations) {
+				if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)) {
+					mergedAnnotations
+							.add(findMergedAnnotation(root, annotation.annotationType()));
+				}
 			}
 		}
 		return mergedAnnotations;

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

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -79,12 +79,15 @@ class PropertyMappingContextCustomizer implements ContextCustomizer {
 			Set<Class<?>> components = new LinkedHashSet<Class<?>>();
 			Set<Class<?>> propertyMappings = new LinkedHashSet<Class<?>>();
 			while (beanClass != null) {
-				for (Annotation annotation : AnnotationUtils.getAnnotations(beanClass)) {
-					if (isAnnotated(annotation, Component.class)) {
-						components.add(annotation.annotationType());
-					}
-					if (isAnnotated(annotation, PropertyMapping.class)) {
-						propertyMappings.add(annotation.annotationType());
+				Annotation[] annotations = AnnotationUtils.getAnnotations(beanClass);
+				if (annotations != null) {
+					for (Annotation annotation : annotations) {
+						if (isAnnotated(annotation, Component.class)) {
+							components.add(annotation.annotationType());
+						}
+						if (isAnnotated(annotation, PropertyMapping.class)) {
+							propertyMappings.add(annotation.annotationType());
+						}
 					}
 				}
 				beanClass = beanClass.getSuperclass();