Delegate fails for Custom Container Component

[chintan1997]

Hello,

I am writing custom container component by extending AEM core container component. I am trying to use delegation pattern for updating a method. But delegation fails with Null Pointer Exception.

So far, I have AEM container component with sling:resourceSuperType="core/wcm/components/container/v1/container" set and no other logic set from frontend side. I created an interface ContainerModel.java extending Container model from 

com.adobe.cq.wcm.core.components.models to have a testMethod as addition method. I created 

ContainerModelImpl.class that implements ContainerModel.

My @Model looks like below.

@Model(
        adaptables = SlingHttpServletRequest.class,
        adapters = { Container.class, ComponentExporter.class},
        resourceType = ContainerModelImpl.RESOURCE_TYPE,
        defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL
)

The RESOURCE_TYPE is set as mysite/components/container pointing to container component. I am initializing delegate as below.

@Deleted Account
@Via(type = ResourceSuperType.class)
private Container delegate;

Now, all I am trying is to Override getId method that just returns delegate.getId() to test it out but it fails as well. Just a note that I am using Exporter as below.

@exporter(
        name = ExporterConstants.SLING_MODEL_EXPORTER_NAME,
        extensions = ExporterConstants.SLING_MODEL_EXTENSION
)

All other methods follow same logic and I am delegating to parent methods.

I am getting below warning and then null pointer exception pointing back to delegate.getId() statement.

*WARN*  GET /content/mysite/us/en/mysitepage.model.json HTTP/1.1] org.apache.sling.models.impl.via.ResourceSuperTypeViaProvider Could not determine forced resource type for ResourceTypeForcingResourceWrapper, type=wcm/foundation/components/responsivegrid, path=/content/mysite/us/en/mysitepage/jcr:content/root, resource=[ResourceTypeForcingResourceWrapper, type=core/wcm/components/container/v1/container, path=/content/mysite/us/en/mysitepage/jcr:content/root, resource=[JcrNodeResource, type=mysite/components/container, superType=null, path=/content/mysite/us/en/mysitepage/jcr:content/root]] using via value .

Am I missing some additional requirements for delegating Container component? The warning mentions about  wcm/foundation/components/responsivegrid. Do I need to configure something for that part? I am using delegation pattern for other components in same codebase with same approach but they are working fine and can initialize delegate as expected.

[Vijayalakshmi_S]

If container resource export path (PAGENAME/jcr:content/root/container.<<default/custom>>.json) works fine per your confirmation with both default selector(model) as well as custom selector, then it should be the same response at page level unless you have customization for Page model or you are checking a different property.