Delegation Pattern for Sling Models returns null object | Community
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TarunKumar
Community Advisor
TarunKumarCommunity Advisor
Community Advisor
November 12, 2021

Delegation Pattern for Sling Models returns null object

  • November 12, 2021
  • 1 reply
  • 3794 views

I am trying to delegate core navigation component for my proxy navigation component. I have used below code snippet for that purpose in my sling model class.

@1961677
@2434638(type = ResourceSuperType.class)
private Navigation nav;

 

But  this type of injection is providing null object when creating model object using modelfactory. Any suggestion would be helpful.

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1 reply

Asutosh_Jena_
Community Advisor
Asutosh_Jena_Community Advisor
Community Advisor
November 12, 2021

Hi @tarunkumar 

 

Please refer the below links:

https://levelup.gitconnected.com/aem-extend-core-component-models-using-resource-type-association-and-delegation-b8855ed281e2

 

https://aemexplained.wordpress.com/aem-guide/extending-component-using-sling-delegation/

 

Thanks!

    TarunKumar
    Community Advisor
    TarunKumarCommunity AdvisorAuthor
    Community Advisor
    November 12, 2021

    HI @asutosh_jena_ 

    I have followed the same approach as mentioned the article provided by you. However, I am facing issue when I am trying to instantiate my custom model class using below line of codes:

    NavigationCustomModel navigation= resource.adaptTo(NavigationCustomModel.class);

    Above returns navigation as null.

      MohitKumarK
      MohitKumarK
      Level 3
      November 16, 2021

      Hi @mohitkumark 

      Thanks for your reply. I have tried adapting to resource "myproject/components/content/navigation" as well but this also doesn't serve the purpose and my navigation object appear as null.

      Also attached is the screen print of my navigation component which is extending the core navigation component.

       

       


      @tarunkumar ,

      Resource resource = req.getResourceResolver().getResource("/content/hq/en/testpage");

      in this line what ever the path you are giving, that resource should be of type myproject/components/content/navigation.

       

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