Spring autowired bean for @Aspect aspect is null

For Spring Boot to use @Autowired with AspectJ I have found the following method. In configuration class add your aspect:

@Configuration
@ComponentScan("com.kirillch.eqrul")
public class AspectConfig {

    @Bean
    public EmailAspect theAspect() {
        EmailAspect aspect = Aspects.aspectOf(EmailAspect.class);
        return aspect;
    }

}

Then you can successfully autowire your services in your aspect class:

@Aspect
public class EmailAspect {

    @Autowired
    EmailService emailService;

The aspect is a singleton object and is created outside the Spring container. A solution with XML configuration is to use Spring's factory method to retrieve the aspect.

<bean id="syncLoggingAspect" class="uk.co.demo.SyncLoggingAspect" 
     factory-method="aspectOf" />

With this configuration the aspect will be treated as any other Spring bean and the autowiring will work as normal.

You have to use the factory-method also on Enum objects and other objects without a constructor or objects that are created outside the Spring container.

Another option is to add @Configurable to your aspect class instead of messing around with XML.