Consider annotated methods in AnnotationRevisionMetadata.

We now detect annotated methods.

Closes #2569

src/main/java/org/springframework/data/history/AnnotationRevisionMetadata.java

@@ -23,6 +23,7 @@ import java.util.Date;
 import java.util.Optional;
 
 import org.springframework.data.util.AnnotationDetectionFieldCallback;
+import org.springframework.data.util.AnnotationDetectionMethodCallback;
 import org.springframework.data.util.Lazy;
 import org.springframework.util.Assert;
 import org.springframework.util.ReflectionUtils;
@@ -34,6 +35,7 @@ import org.springframework.util.ReflectionUtils;
  *
  * @author Oliver Gierke
  * @author Jens Schauder
+ * @author Mark Paluch
  */
 public class AnnotationRevisionMetadata<N extends Number & Comparable<N>> implements RevisionMetadata<N> {
 
@@ -98,11 +100,19 @@ public class AnnotationRevisionMetadata<N extends Number & Comparable<N>> implem
 		return (T) entity;
 	}
 
+	@SuppressWarnings("unchecked")
 	private static <T> Lazy<Optional<T>> detectAnnotation(Object entity, Class<? extends Annotation> annotationType) {
 
 		return Lazy.of(() -> {
 
-			var callback = new AnnotationDetectionFieldCallback(annotationType);
+			AnnotationDetectionMethodCallback<? extends Annotation> methodCallback = new AnnotationDetectionMethodCallback<>(
+					annotationType);
+			ReflectionUtils.doWithMethods(entity.getClass(), methodCallback);
+			if (methodCallback.getMethod() != null) {
+				return Optional.ofNullable((T) ReflectionUtils.invokeMethod(methodCallback.getRequiredMethod(), entity));
+			}
+
+			AnnotationDetectionFieldCallback callback = new AnnotationDetectionFieldCallback(annotationType);
 			ReflectionUtils.doWithFields(entity.getClass(), callback);
 			return Optional.ofNullable(callback.getValue(entity));
 		});

src/main/java/org/springframework/data/util/AnnotationDetectionMethodCallback.java

@@ -21,6 +21,7 @@ import java.lang.reflect.Method;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.util.ReflectionUtils.MethodCallback;
 
 /**
@@ -28,6 +29,7 @@ import org.springframework.util.ReflectionUtils.MethodCallback;
  *
  * @author Oliver Gierke
  * @author Christoph Strobl
+ * @author Mark Paluch
  */
 public class AnnotationDetectionMethodCallback<A extends Annotation> implements MethodCallback {
 
@@ -121,6 +123,8 @@ public class AnnotationDetectionMethodCallback<A extends Annotation> implements
 			}
 
 			this.annotation = foundAnnotation;
+
+			ReflectionUtils.makeAccessible(method);
 			this.foundMethod = method;
 		}
 	}