use @autowired in abstract base class

Question

As I know, field injection is not recommended. Should use constructor instead.

What I\'m trying to do here is using @Autowired in

Answer 1

I'd suggest using @Configuration classes. That way you can remove Spring annotations entirely from your business classes:

public class Sub extends Base {

    private final MySubService mySubService;

    public Sub(MySubService mySubService, MyDemoService myDemoService){
        super(myDemoService);
        this.mySubService = mySubService;
    }
} 

Spring config:

@Configuration
public class SubConfig{

    @Bean
    public Sub sub(MySubService subService, MyDemoService demoService){
        return new Sub(subService, demoService);
    }
}

With Configuration classes, you no longer rely on magical classpath scanning, but actually instantiate beans manually again. There's a lot less surprises in this approach.