Deprecate ClassUtils.isCglibProxy methods in favor of AOP-level checks

Closes gh-22706

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -166,7 +166,7 @@ class CglibAopProxy implements AopProxy, Serializable {
 			Assert.state(rootClass != null, "Target class must be available for creating a CGLIB proxy");
 
 			Class<?> proxySuperClass = rootClass;
-			if (ClassUtils.isCglibProxyClass(rootClass)) {
+			if (rootClass.getName().contains(ClassUtils.CGLIB_CLASS_SEPARATOR)) {
 				proxySuperClass = rootClass.getSuperclass();
 				Class<?>[] additionalInterfaces = rootClass.getInterfaces();
 				for (Class<?> additionalInterface : additionalInterfaces) {

spring-aop/src/main/java/org/springframework/aop/support/AopUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -66,8 +66,8 @@ public abstract class AopUtils {
 	 * @see #isCglibProxy
 	 */
 	public static boolean isAopProxy(@Nullable Object object) {
-		return (object instanceof SpringProxy &&
-				(Proxy.isProxyClass(object.getClass()) || ClassUtils.isCglibProxyClass(object.getClass())));
+		return (object instanceof SpringProxy && (Proxy.isProxyClass(object.getClass()) ||
+				object.getClass().getName().contains(ClassUtils.CGLIB_CLASS_SEPARATOR)));
 	}
 
 	/**
@@ -91,7 +91,8 @@ public abstract class AopUtils {
 	 * @see ClassUtils#isCglibProxy(Object)
 	 */
 	public static boolean isCglibProxy(@Nullable Object object) {
-		return (object instanceof SpringProxy && ClassUtils.isCglibProxy(object));
+		return (object instanceof SpringProxy &&
+				object.getClass().getName().contains(ClassUtils.CGLIB_CLASS_SEPARATOR));
 	}
 
 	/**

spring-core/src/main/java/org/springframework/util/ClassUtils.java

@@ -841,7 +841,9 @@ public abstract class ClassUtils {
 	 * @param object the object to check
 	 * @see #isCglibProxyClass(Class)
 	 * @see org.springframework.aop.support.AopUtils#isCglibProxy(Object)
+	 * @deprecated as of 5.2, in favor of custom (possibly narrower) checks
 	 */
+	@Deprecated
 	public static boolean isCglibProxy(Object object) {
 		return isCglibProxyClass(object.getClass());
 	}
@@ -850,7 +852,9 @@ public abstract class ClassUtils {
 	 * Check whether the specified class is a CGLIB-generated class.
 	 * @param clazz the class to check
 	 * @see #isCglibProxyClassName(String)
+	 * @deprecated as of 5.2, in favor of custom (possibly narrower) checks
 	 */
+	@Deprecated
 	public static boolean isCglibProxyClass(@Nullable Class<?> clazz) {
 		return (clazz != null && isCglibProxyClassName(clazz.getName()));
 	}
@@ -858,7 +862,9 @@ public abstract class ClassUtils {
 	/**
 	 * Check whether the specified class name is a CGLIB-generated class.
 	 * @param className the class name to check
+	 * @deprecated as of 5.2, in favor of custom (possibly narrower) checks
 	 */
+	@Deprecated
 	public static boolean isCglibProxyClassName(@Nullable String className) {
 		return (className != null && className.contains(CGLIB_CLASS_SEPARATOR));
 	}