Polish "Add support for Async invocation in a native image"

This registers the hints if the annotation post processor is active,
rather than statically.

See gh-28710

spring-context/src/main/java/org/springframework/scheduling/annotation/AsyncAnnotationBeanPostProcessor.java

@@ -25,9 +25,14 @@ import org.apache.commons.logging.LogFactory;
 
 import org.springframework.aop.framework.autoproxy.AbstractBeanFactoryAwareAdvisingPostProcessor;
 import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.support.RuntimeHintsUtils;
 import org.springframework.beans.factory.BeanFactory;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.core.task.TaskExecutor;
 import org.springframework.lang.Nullable;
+import org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor.AsyncAnnotationRuntimeHints;
 import org.springframework.util.Assert;
 import org.springframework.util.function.SingletonSupplier;
 
@@ -62,6 +67,7 @@ import org.springframework.util.function.SingletonSupplier;
  * @see ScheduledAnnotationBeanPostProcessor
  */
 @SuppressWarnings("serial")
+@ImportRuntimeHints(AsyncAnnotationRuntimeHints.class)
 public class AsyncAnnotationBeanPostProcessor extends AbstractBeanFactoryAwareAdvisingPostProcessor {
 
 	/**
@@ -154,4 +160,13 @@ public class AsyncAnnotationBeanPostProcessor extends AbstractBeanFactoryAwareAd
 		this.advisor = advisor;
 	}
 
+	static class AsyncAnnotationRuntimeHints implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			RuntimeHintsUtils.registerAnnotation(hints, Async.class);
+		}
+
+	}
+
 }

spring-context/src/main/java/org/springframework/scheduling/annotation/SchedulingRuntimeHints.java

@@ -1,37 +0,0 @@
-/*
- * Copyright 2002-2022 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.scheduling.annotation;
-
-import org.springframework.aot.hint.RuntimeHints;
-import org.springframework.aot.hint.RuntimeHintsRegistrar;
-import org.springframework.aot.hint.support.RuntimeHintsUtils;
-import org.springframework.lang.Nullable;
-
-/**
- * {@link RuntimeHintsRegistrar} for scheduling annotations.
- *
- * @author Stephane Nicoll
- * @since 6.0
- */
-class SchedulingRuntimeHints implements RuntimeHintsRegistrar {
-
-	@Override
-	public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
-		RuntimeHintsUtils.registerAnnotation(hints, Async.class);
-	}
-
-}

spring-context/src/main/resources/META-INF/spring/aot.factories

@@ -1,5 +1,2 @@
-org.springframework.aot.hint.RuntimeHintsRegistrar= \
-org.springframework.scheduling.annotation.SchedulingRuntimeHints
-
 org.springframework.beans.factory.aot.BeanRegistrationAotProcessor= \
 org.springframework.context.aot.ReflectiveProcessorBeanRegistrationAotProcessor