Support multiple @ImportRuntimeHints in the type hierarchy

This commit copies and adapts the logic from
DefaultListableBeanFactory#findMergedAnnotationOnBean
private method to make it suitable for returning multiple
annotations found in the type hierarchy in order
to support this use case with @ImportRuntimeHints.

Closes gh-29361

spring-context/src/main/java/org/springframework/context/aot/RuntimeHintsBeanFactoryInitializationAotProcessor.java

@@ -16,8 +16,12 @@
 
 package org.springframework.context.aot;
 
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -32,8 +36,12 @@ import org.springframework.beans.factory.aot.AotServices;
 import org.springframework.beans.factory.aot.BeanFactoryInitializationAotContribution;
 import org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor;
 import org.springframework.beans.factory.aot.BeanFactoryInitializationCode;
+import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.annotation.ImportRuntimeHints;
+import org.springframework.core.annotation.MergedAnnotation;
+import org.springframework.core.annotation.MergedAnnotations;
 import org.springframework.core.log.LogMessage;
 import org.springframework.lang.Nullable;
 
@@ -45,6 +53,7 @@ import org.springframework.lang.Nullable;
  * classes or bean methods.
  *
  * @author Brian Clozel
+ * @author Sebastien Deleuze
  */
 class RuntimeHintsBeanFactoryInitializationAotProcessor implements BeanFactoryInitializationAotProcessor {
 
@@ -66,15 +75,50 @@ class RuntimeHintsBeanFactoryInitializationAotProcessor implements BeanFactoryIn
 		Set<Class<? extends RuntimeHintsRegistrar>> registrarClasses = new LinkedHashSet<>();
 		for (String beanName : beanFactory
 				.getBeanNamesForAnnotation(ImportRuntimeHints.class)) {
-			ImportRuntimeHints annotation = beanFactory.findAnnotationOnBean(beanName,
-					ImportRuntimeHints.class);
-			if (annotation != null) {
-				registrarClasses.addAll(extractFromBeanDefinition(beanName, annotation));
-			}
+			findAnnotationsOnBean(beanFactory, beanName,
+					ImportRuntimeHints.class).forEach(annotation ->
+					registrarClasses.addAll(extractFromBeanDefinition(beanName, annotation)));
 		}
 		return registrarClasses;
 	}
 
+	private <A extends Annotation> List<A> findAnnotationsOnBean(ConfigurableListableBeanFactory beanFactory,
+			String beanName, Class<A> annotationType) {
+
+		List<A> annotations = new ArrayList<>();
+		Class<?> beanType = beanFactory.getType(beanName, true);
+		if (beanType != null) {
+				MergedAnnotations.from(beanType, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
+						.stream(annotationType)
+						.filter(MergedAnnotation::isPresent)
+						.forEach(mergedAnnotation -> annotations.add(mergedAnnotation.synthesize()));
+		}
+		if (beanFactory.containsBeanDefinition(beanName)) {
+			BeanDefinition bd = beanFactory.getBeanDefinition(beanName);
+			if (bd instanceof RootBeanDefinition rbd) {
+				// Check raw bean class, e.g. in case of a proxy.
+				if (rbd.hasBeanClass() && rbd.getFactoryMethodName() == null) {
+					Class<?> beanClass = rbd.getBeanClass();
+					if (beanClass != beanType) {
+						MergedAnnotations.from(beanClass, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
+								.stream(annotationType)
+								.filter(MergedAnnotation::isPresent)
+								.forEach(mergedAnnotation -> annotations.add(mergedAnnotation.synthesize()));
+					}
+				}
+				// Check annotations declared on factory method, if any.
+				Method factoryMethod = rbd.getResolvedFactoryMethod();
+				if (factoryMethod != null) {
+					MergedAnnotations.from(factoryMethod, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
+							.stream(annotationType)
+							.filter(MergedAnnotation::isPresent)
+							.forEach(mergedAnnotation -> annotations.add(mergedAnnotation.synthesize()));
+				}
+			}
+		}
+		return annotations;
+	}
+
 	private Set<Class<? extends RuntimeHintsRegistrar>> extractFromBeanDefinition(String beanName,
 			ImportRuntimeHints annotation) {