Relaxed BeanFactory assertion in resolveInterceptorNames

Issue: SPR-16347

spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAutoProxyCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -544,13 +544,13 @@ public abstract class AbstractAutoProxyCreator extends ProxyProcessorSupport
 	 * @see #setInterceptorNames
 	 */
 	private Advisor[] resolveInterceptorNames() {
-		Assert.state(this.beanFactory != null, "BeanFactory required for resolving interceptor names");
-		ConfigurableBeanFactory cbf = (this.beanFactory instanceof ConfigurableBeanFactory ?
-				(ConfigurableBeanFactory) this.beanFactory : null);
+		BeanFactory bf = this.beanFactory;
+		ConfigurableBeanFactory cbf = (bf instanceof ConfigurableBeanFactory ? (ConfigurableBeanFactory) bf : null);
 		List<Advisor> advisors = new ArrayList<>();
 		for (String beanName : this.interceptorNames) {
 			if (cbf == null || !cbf.isCurrentlyInCreation(beanName)) {
-				Object next = this.beanFactory.getBean(beanName);
+				Assert.state(bf != null, "BeanFactory required for resolving interceptor names");
+				Object next = bf.getBean(beanName);
 				advisors.add(this.advisorAdapterRegistry.wrap(next));
 			}
 		}