Log public final method at warn level for non-interface case as well

Closes gh-33939

Author: jhoeller

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

@@ -289,9 +289,15 @@ private void doValidateClass(Class<?> proxySuperClass, @Nullable ClassLoader pro
 				int mod = method.getModifiers();
 				if (!Modifier.isStatic(mod) && !Modifier.isPrivate(mod)) {
 					if (Modifier.isFinal(mod)) {
-						if (logger.isWarnEnabled() && implementsInterface(method, ifcs)) {
-							logger.warn("Unable to proxy interface-implementing method [" + method + "] because " +
-									"it is marked as final, consider using interface-based JDK proxies instead.");
+						if (logger.isWarnEnabled() && Modifier.isPublic(mod)) {
+							if (implementsInterface(method, ifcs)) {
+								logger.warn("Unable to proxy interface-implementing method [" + method + "] because " +
+										"it is marked as final, consider using interface-based JDK proxies instead.");
+							}
+							else {
+								logger.warn("Public final method [" + method + "] cannot get proxied via CGLIB, " +
+										"consider removing the final marker or using interface-based JDK proxies.");
+							}
 						}
 						if (logger.isDebugEnabled()) {
 							logger.debug("Final method [" + method + "] cannot get proxied via CGLIB: " +