@EnableAspectJAutoProxy does not work

Question

I am using Spring Boot, and I would like to use AspectJ with it.

The following works (of course):

@Aspect
@Component
public class RequestMappingAspect {

    @Before("@annotation(org.springframework.web.bind.annotation.RequestMapping)")
    public void advice(JoinPoint joinPoint) {
        ...
    }
}

However, if @Component is removed and @EnableAspectJAutoProxy is added, the following does not work.

@SpringBootApplication
@EnableSwagger2
@EnableAspectJAutoProxy
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

How to enable AspectJ auto proxy correctly?

With @EnableAspectJAutoProxy you do not use AspectJ, but proxy-based Spring AOP. But probably that is what you want anyway. — kriegaex
Ofcourse it won't work... I you remove @Component no instance of the aspect will be created, hence no aspects available so nothing to use. You need both @Component and @Aspect to make it work (or define the aspect as a @Bean method). Either way an instance of the aspect has to be there to make it work. — M. Deinum

vegaasen vegaasen · Accepted Answer · 2017-01-23T09:07:17

Wondering about the same thing, we ended up doing something similar to this:

@EnableAspectJAutoProxy(proxyTargetClass = true)
@Configuration("Main applicationContext")
@ComponentScan(
    basePackages = {"com.where.ever"},
    excludeFilters = {@ComponentScan.Filter(Aspect.class)})
public class ApplicationConfiguration {
    @Bean(autowire = Autowire.BY_TYPE)
    public SomeAspect someAspect() {
        return Aspects.aspectOf(SomeAspect.class);
    }
    ...
    ...
}

This enabled us to just add the @Aspect-annotation on the aspects, which also wired them correctly. Might be that this was a pointless reply, however, it explains how we solved the issue - and not the actual solution to the problem. Let me know if you want this to be deleted.

@EnableAspectJAutoProxy does not work

2 Answers