Need help in understanding Sling Models Annotations like @Model, @Inject, and @PostConstruct

[aem101]

What are use of @Model, @inject, and @PostConstruct annotations in Adobe Experience Manager (AEM)? Help me explain this in details. I'd like to gain a deeper understanding of how these annotations work and their practical applications when creating Sling Models in AEM. Any insights or examples would be greatly appreciated!

[Mahedi_Sabuj]

Hi @aem101,

Please refer to the following blog posts, provides details explanation of Sling models.
http://www.sgaemsolutions.com/2017/08/deep-dive-on-sling-models-part-1.html
http://www.sgaemsolutions.com/2017/08/deep-dive-on-sling-model-in-aem-63-part.html

You might consider checking out the following discussion thread as well.
https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/annotations-in-sling-model... 

[EstebanBustamante]

Hi

In my opinion, there is nothing better than the official source, you can learn and understand about sling models on the official sling site. Also, there is a specific section talking about the Available Injectors with some examples, you can read more here: https://sling.apache.org/documentation/bundles/models.html#available-injectors 

[aanchal-sikka · Accepted solution]

Hello @aem101 

For @Model & @PostConstruct, please refer to the documentation shared by @EstebanBustamante 

@Inject is rarely used in Sling Models now. There are many alternatives are available which are specific to the needs.

Please refer to AEM Sling Model Injectors Annotations Cheat Sheet Reference Guide - Sourced Code

They have beautifully explained the mappings between old @Inject way to new recommended annotations like 

1. @ScriptVariable
2. @ValueMapValue
3. @ResourcePath
4. @ChildResource
5. @RequestAttribute
6. @OSGiService
7. @Self
8. @SlingObject