[SOLVED] Order of constructor calls in Spring boot

Order of constructor calls in Spring boot

I have a class ServiceClass annotated with @Service, inside that I do constructor injection for an object.

@Service
public class ServiceClass
{
    Dog dog;

    @Autowired
    public ServiceClass(Dog dog) {
        this.dog = dog;
    }
}

Now I also need to add some configuration code, that should run just once and prior to any other method call inside ServiceClass.

I thought of creating a no arg constructor and put those configuration inside those, but spring doesn't call that constructor.

Should I put it inside constructor where I do injection, or is there some other way to achieve it.

Solution

There are in this case two suitable options to go for without implementing the initialization logic in your constructor.

The First one is an @PostConstruct where you define your configuration logic. Another option would be to let your ServiceClass implement the InitializingBean interface and put this configuration logic in your afterPropertiesSet method.