Sling Model: Post Construct v/s COnstructor

[AniketSi]

Hello 

I am curious about how Sling handles Sling Model. 

Say, I instantiate a Sling Model in Sightly, then a PostConstruct is called. Why not a constructor?

[aanchal-sikka · Accepted solution]

@AniketSi 

The @PostConstruct annotation essentially serves as an alternative to a constructor. If you were to employ a constructor in your model, you would observe that, upon its execution, the fields annotated with @Inject are still unassigned. Attempting further initialization with these fields at this point would result in a NullPointerException.

The entire sequence unfolds as follows:

1. Sling generates a new instance of your model (e.g., new MyModel()).
2. Sling populates all the dependencies you’ve declared using the @Inject annotation.
3. Sling proceeds to invoke the method annotated with @PostConstruct.

Sling model annotations: Basics – Adobe Experience Manager Blog (techrevel.blog) (Refer to PostConstruct Annotation section)