无法在Spring AOP中检测类级自定义注释

Question

I am trying to intercept classes in Spring with following settings

Interceptor

@Aspect
@Component
public class MyInterceptor {

    @Around("execution(* com.example.services..*(..))")
    public Object intercept(ProceedingJoinPoint pjp) throws Throwable {
        if (pjp.getTarget() != null && pjp.getTarget().getClass().getAnnotation(MyAnnotation.class) != null) {
            System.out.println("Yes annotation present");
        } else {
            System.out.println("Annotation not present");
        }

        return = pjp.proceed();
    }   
}

and the class being intercepted is as follows

@Component
@MyAnnotation
public class MyAlert implements IAlert {

}

Every thing is working fine until and unless I make the following changes

@Configuration
@PropertySource(value = { "file:${catalina.home}/conf/my.properties" })
@Component
@MyAnnotation
public class MyAlert implements IAlert {
    @Autowired
    private Environment environment;
} 

I wanted to read properties located in conf folder of tomcat7, after making these changes my interceptor is unable to read my custom annotation @MyAnnotation . it says (custom message written in interceptor)

Annotation not present

and here is custom annotation

@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {

}

I really want the class should be intercepted and annotation must be detected on class if it is annotated. I also want to read properties from conf folder in that intercepted class.

Answer 1

Your check for the annotation fails because you are checking on the dynamic proxy's type instead of the actual annotated class's one. You can work around it like this:

pjp.getSignature().getDeclaringType().getAnnotation(RestController.class) != null