Order of loading during Spring Java Config

4
votes

I have a Java Config class that looks similar to:

@Configuration
public class MyConfig {

    @Autowired(required = true)
    private MyRegistry registry;

    public CustomAttributeConfig() {
        . . .
    }

    @Bean
    public IBeanApiType someBeanApi() {
       return new SomeBeanApi();
    }

    @PostConstruct
    public void postConstructionCodeHere() {
        registry.register(someBeanApi());
    }
    . . .

Is the order of execution of the @Autowired, @Bean, and @PostConstruct guaranteed in any way? What if the @Bean used the @Autowired registry value?

The order of execution I am seeing in my real code is:

  1. the autowired field
  2. the @PostConstruct annotated method
  3. the @Bean annotated method

My goal is to have 2 and 3 to execute in reverse order. How do I know the order of mixtures of these annotations in a Java Config file and what options are available to control that order?

EDITTED! Thought about this some more and while I am interested in the order, that may not really be critical. I modified the code above slightly to reflect the fact that I want to call the @Bean constructor from the @PostConstruct code.

This seems to work fine for the very limited tests I have done. Does anyone know if all the necessary Spring initialization is guaranteed to be finished when a @PostConstruct is called such that calling an @Bean annotated method will always work? I did step into the calls and see the interceptors being invoked, but I don't know that the proxy I will get back will always be the "right" one, with all the advisors, advice, etc properly attached.

2
javaspringdependency-injectionconfig

2 Answers

0
votes

Yes, in the current construct where you are using bean creation method, Spring will ensure that this method returns created bean. And of course ensures that the bean is properly initialized

0
votes

you can have following code inside your SomeBeanApi rather than MyConfig 

   @Autowired(required = true)
    private MyRegistry registry;

   @PostConstruct
    public void postConstructionCodeHere() {
        registry.register(this);
    }