Community Advisor

Delegation Pattern for Sling Models returns null object

Forum|Forum|4 years ago
November 12, 2021
1 risposta
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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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Asutosh_Jena_

Community Advisor

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

Autore

Community Advisor

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

Level 3

Hi @tarunkumar ,

In order to use sling delegation, you have to have adaptable of your sling model as SlingHttpServletRequest and resourceType property in model annotation.

your component should have property slingResourceSuperType pointed to right component.

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

In your case whatever the resource you are trying to adapt. It should point to a component which has this slingResourceSuperType in it.

if you can share sample model class how you are trying to do. I can help you. (Also component xml under apps is needed)

Thanks!

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