@EnableAspectJAutoProxy not work with proxyTargetClass=false

Question

I am learning about Spring AOP at first time. I am reading about in this sites: Site2 and Site1 Following this I have made the next classes Main class: ``` public class App { public static void main(String[] args) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(); context.register(AppConfig.class); context.refresh(); MessagePrinter printer = context.getBean(MessagePrinter.class); System.out.println(printer.getMessage()); } } ``` App config class: ``` @Configuration @ComponentScan("com.pjcom.springaop") @EnableAspectJAutoProxy(proxyTargetClass=true) public class AppConfig { @PostConstruct public void doAlert() { System.out.println("Application done."); } } ``` Aspect class: ``` @Component @Aspect public class AspectMonitor { @Before("execution(* com.pjcom.springaop.message.impl.MessagePrinter.getMessage(..))") public void beforeMessagePointCut(JoinPoint joinPoint) { System.out.println("Monitorizando Mensaje."); } } ``` And others... Just like that…

Accepted Answer

```
@EnableAspectJAutoProxy(proxyTargetClass=false)
```

Indicates that JDK dynamic proxy will be created to support aspect execution on the object. And therefore as this type of proxy requires a class to implement an interface your `MessagePrinter` must implement some interface which declares method `getMessage`.

```
@EnableAspectJAutoProxy(proxyTargetClass=true)
```

On the opposite instruct to use CGLIB proxy which is able to create proxy for a class without an interface.

@EnableAspectJAutoProxy not work with proxyTargetClass=false

Solution

Problem