В чем заключается взаимосвязь между механизмом Self-Injection и аспектно-ориентированным программированием в Spring?

In Spring, aspect-oriented programming (AOP) allows injecting additional behavior (aspects) into beans without modifying their code, usually through proxies. However, if a method annotated with an aspect (e.g., @Transactional) is called within the same bean, the aspect will not be triggered because the call is direct, bypassing the proxy.

The Self-Injection mechanism solves this problem: the bean injects itself through the Spring container (for example, via @Autowired), and when methods are called through this injected proxy instance, the aspects are applied correctly. Thus, Self-Injection ensures the proper functioning of aspects during internal method calls within the same bean.

Example:

@Component
public class MyService {
    @Autowired
    private MyService selfProxy;

    @Transactional
    public void transactionalMethod() {
        // ...
    }

    public void callTransactional() {
        // Call through selfProxy to trigger the aspect
        selfProxy.transactionalMethod();
    }
}