DefaultAdvisorChainFactory never passes null into ClassFilter, enabling async advisor to work without target class as well

Issue: SPR-11910
(cherry picked from commit a9b650f)

spring-aop/src/main/java/org/springframework/aop/framework/AdvisorChainFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -32,10 +32,10 @@ public interface AdvisorChainFactory {
 	 * for the given advisor chain configuration.
 	 * @param config the AOP configuration in the form of an Advised object
 	 * @param method the proxied method
-	 * @param targetClass the target class
+	 * @param targetClass the target class (may be {@code null} to indicate a proxy without
+	 * target object, in which case the method's declaring class is the next best option)
 	 * @return List of MethodInterceptors (may also include InterceptorAndDynamicMethodMatchers)
 	 */
-	List<Object> getInterceptorsAndDynamicInterceptionAdvice(
-			Advised config, Method method, Class<?> targetClass);
+	List<Object> getInterceptorsAndDynamicInterceptionAdvice(Advised config, Method method, Class<?> targetClass);
 
 }

spring-aop/src/main/java/org/springframework/aop/framework/DefaultAdvisorChainFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -50,19 +50,21 @@ public class DefaultAdvisorChainFactory implements AdvisorChainFactory, Serializ
 	public List<Object> getInterceptorsAndDynamicInterceptionAdvice(
 			Advised config, Method method, Class<?> targetClass) {
 
-		// This is somewhat tricky... we have to process introductions first,
+		// This is somewhat tricky... We have to process introductions first,
 		// but we need to preserve order in the ultimate list.
 		List<Object> interceptorList = new ArrayList<Object>(config.getAdvisors().length);
-		boolean hasIntroductions = hasMatchingIntroductions(config, targetClass);
+		Class<?> actualClass = (targetClass != null ? targetClass : method.getDeclaringClass());
+		boolean hasIntroductions = hasMatchingIntroductions(config, actualClass);
 		AdvisorAdapterRegistry registry = GlobalAdvisorAdapterRegistry.getInstance();
+
 		for (Advisor advisor : config.getAdvisors()) {
 			if (advisor instanceof PointcutAdvisor) {
 				// Add it conditionally.
 				PointcutAdvisor pointcutAdvisor = (PointcutAdvisor) advisor;
-				if (config.isPreFiltered() || pointcutAdvisor.getPointcut().getClassFilter().matches(targetClass)) {
+				if (config.isPreFiltered() || pointcutAdvisor.getPointcut().getClassFilter().matches(actualClass)) {
 					MethodInterceptor[] interceptors = registry.getInterceptors(advisor);
 					MethodMatcher mm = pointcutAdvisor.getPointcut().getMethodMatcher();
-					if (MethodMatchers.matches(mm, method, targetClass, hasIntroductions)) {
+					if (MethodMatchers.matches(mm, method, actualClass, hasIntroductions)) {
 						if (mm.isRuntime()) {
 							// Creating a new object instance in the getInterceptors() method
 							// isn't a problem as we normally cache created chains.
@@ -78,7 +80,7 @@ public class DefaultAdvisorChainFactory implements AdvisorChainFactory, Serializ
 			}
 			else if (advisor instanceof IntroductionAdvisor) {
 				IntroductionAdvisor ia = (IntroductionAdvisor) advisor;
-				if (config.isPreFiltered() || ia.getClassFilter().matches(targetClass)) {
+				if (config.isPreFiltered() || ia.getClassFilter().matches(actualClass)) {
 					Interceptor[] interceptors = registry.getInterceptors(advisor);
 					interceptorList.addAll(Arrays.asList(interceptors));
 				}
@@ -88,18 +90,19 @@ public class DefaultAdvisorChainFactory implements AdvisorChainFactory, Serializ
 				interceptorList.addAll(Arrays.asList(interceptors));
 			}
 		}
+
 		return interceptorList;
 	}
 
 	/**
 	 * Determine whether the Advisors contain matching introductions.
 	 */
-	private static boolean hasMatchingIntroductions(Advised config, Class<?> targetClass) {
+	private static boolean hasMatchingIntroductions(Advised config, Class<?> actualClass) {
 		for (int i = 0; i < config.getAdvisors().length; i++) {
 			Advisor advisor = config.getAdvisors()[i];
 			if (advisor instanceof IntroductionAdvisor) {
 				IntroductionAdvisor ia = (IntroductionAdvisor) advisor;
-				if (ia.getClassFilter().matches(targetClass)) {
+				if (ia.getClassFilter().matches(actualClass)) {
 					return true;
 				}
 			}