用Spring-Factory创建的ENUM bean，但从未调用@PostConstruct

Question

I have an Enum :

public enum MyEnum {

    INSTANCE;

    @Autowired
    Regroupements regroupements;

    @PostConstruct
    public void initi()
    {
        System.out.println("---------- i am not called!");
    }

    private MyEnum() {
        System.out.println("---------- i am called!");
    }

}

And a Spring-Factory

@Component
public class MyEnumFactory implements FactoryBean<MyEnum>{

    @Override
    public MyEnum getObject() throws Exception {
        return MyEnum.INSTANCE;
    }

    @Override
    public Class<?> getObjectType() {
        return MyEnum.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

}

The problem is : when in call the method of the factory to give me the unique INSTANCE, the init() method is never called! you'll notice that, as it is an Enum, the class don't have @Component annotation. it's why I use a factory.

what I want is to launch a post-construct, it doesn't matter the way.

Answer 1

You can't use enum as bean (and normally you don't have to), so you can neither use @PostConstruct on it, nor even autowire anything inside: your dependency Regroupements regroupements; is going to be null .