Add required AspectJ field hints

This commit adds reflection hints on fields for
classes compiled by AspectJ.

Closes gh-31575

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/AbstractAspectJAdvisorFactory.java

@@ -87,7 +87,7 @@ public abstract class AbstractAspectJAdvisorFactory implements AspectJAdvisorFac
 	 * We need to detect this as "code-style" AspectJ aspects should not be
 	 * interpreted by Spring AOP.
 	 */
-	private boolean compiledByAjc(Class<?> clazz) {
+	static boolean compiledByAjc(Class<?> clazz) {
 		// The AJTypeSystem goes to great lengths to provide a uniform appearance between code-style and
 		// annotation-style aspects. Therefore there is no 'clean' way to tell them apart. Here we rely on
 		// an implementation detail of the AspectJ compiler.

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/AspectJAdvisorBeanRegistrationAotProcessor.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2002-2023 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.aop.aspectj.annotation;
+
+import org.springframework.aot.generate.GenerationContext;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.beans.factory.aot.BeanRegistrationAotContribution;
+import org.springframework.beans.factory.aot.BeanRegistrationAotProcessor;
+import org.springframework.beans.factory.aot.BeanRegistrationCode;
+import org.springframework.beans.factory.support.RegisteredBean;
+
+/**
+ * An AOT {@link BeanRegistrationAotProcessor} that detects the presence of
+ * classes compiled with AspectJ and adds the related required field hints.
+ *
+ * @author Sebastien Deleuze
+ * @since 6.1
+ */
+public class AspectJAdvisorBeanRegistrationAotProcessor implements BeanRegistrationAotProcessor {
+
+	@Override
+	public BeanRegistrationAotContribution processAheadOfTime(RegisteredBean registeredBean) {
+		Class<?> beanClass = registeredBean.getBeanClass();
+		if (AbstractAspectJAdvisorFactory.compiledByAjc(beanClass)) {
+			return new AspectJAdvisorContribution(beanClass);
+		}
+		return null;
+	}
+
+	private static class AspectJAdvisorContribution implements BeanRegistrationAotContribution {
+
+		private final Class<?> beanClass;
+
+		public AspectJAdvisorContribution(Class<?> beanClass) {
+			this.beanClass = beanClass;
+		}
+
+		@Override
+		public void applyTo(GenerationContext generationContext, BeanRegistrationCode beanRegistrationCode) {
+			generationContext.getRuntimeHints().reflection().registerType(this.beanClass, MemberCategory.DECLARED_FIELDS);
+		}
+	}
+
+}