Problem with @inject annotation in a sling model

[#1]

Hi everyone,

I have a issue with @inject annotation, I try to inject the Resource object inside a Sling Model, but when I debug the code it's null.

This is part of my code:

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ValueMap;
import org.apache.sling.commons.json.JSONArray;
import org.apache.sling.commons.json.JSONException;
import org.apache.sling.commons.json.JSONObject;
import org.apache.sling.models.annotations.Default;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.Optional;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import javax.servlet.jsp.PageContext;

@Model(adaptables = { Resource.class, SlingHttpServletRequest.class })

public class ProductFilter extends AbstractComponent {

   @Inject
   private Resource  resource;

Could someone help me with this issue?

[#2 · Accepted solution]

I found a solution to my problem, it was related with de Sling Models Injectors.

The solution was install the ACS Commons content package from here:
Adobe AEM Commons

This package add a new in injector into AEM, and this inject the Resource Object into the sling model.

Thank you for your answers, they were useful to fix another parts of my sling model.

[#3]

use

@SlingObject
private Resource resource; 

[#4]

Thats correct resource path will be exactly where current component is used.

To get page I always prefer PageManager and resourceResolver

  page = resourceResolver.adaptTo(PageManager.class).getContainingPage(resource);

@Inject @Source("sling-object")
private ResourceResolver resourceResolver;

This is because the present condition you are using may fail when you drop in other place.

[#5]

Hi @smacldonald2008

When i use the injection by constructor i can see that t's pointing to the node that containt the component that use the sling model, i think that it's pointing well.

Debug screen:

You will have to made zoom with the explorer, because this editor reduce the image size.

is the path well or i'm wrong?

Thanks!!

[#6]

Your Resource is not pointing to a valid AEM Resource. You must make sure that you are referencing something in the JCR to which the model binds to.

In our Multifield example here- the model binds to the products node in the dialog that represents the Multi-field node.

@Model(adaptables = Resource.class)

public class Multifield {

    // Inject the products node under the current node

    @Inject

    @Optional

    public Resource products;

    // No need of a post construct as we don't have anything to modify after the

    // model is constructed

}

Adobe Experience Manager Help | Creating a HTL Repeating Data Set 6.3 Component that uses Sling Mode...

In another example - we are using a Resource that we obtained:

resolver = resolverFactory.getServiceResourceResolver(param);

Resource resource = resolver.getResource("/content/testsling/slingmodel");

See how we have valid Resource. Now the Sling Model is bound to a valid JCR Resource and it works.

See this artilce - the only difference is front end is JSP.

Adobe Experience Manager Help | Creating Adobe Experience Manager 6.3 Sling Model Components

THis will point you in the correct direction.

Also - take note in this example - we are creating a system user, providing the correct permission and then use Sling Mapping service (which is the proper way now to get a ResourceResolver).

Hope this helps....

[#7]

Feike Visser I leave only one adaptable and

smacdonald2008​ i insert the @optional annotation and I change de javax.inject dependency with this dependency:

<dependency>

               <groupId>org.apache.geronimo.specs</groupId>

               <artifactId>geronimo-atinject_1.0_spec</artifactId>

               <version>1.0</version>

               <scope>provided</scope>

           </dependency>


But nothing works, the Resource propertie is still null.

On the other hand, if I made the Inject with a constructor it´s work well.

Like this:

But i need to know why @Inject annotation is not working.

There is something else to try?

[#8]

Why do you have two adapters ({ Resource.class, SlingHttpServletRequest.class })

One is simpler and easier to debug.

[#9]

@Self
	private Resource resource;

Should work

ref:acs-aem-samples/SampleSlingModel.java at master · Adobe-Consulting-Services/acs-aem-samples · GitHub

[#10]

Hi,

I am not a great Sling Models developer, but I would expect a @Self annotation:

@Self

Resource resource;

[#11]

What is that lining up with.

See this article that shows you how to inject a Multifield dialog.

Adobe Experience Manager Help | Creating a HTL Repeating Data Set 6.3 Component that uses Sling Mode...

When you use Sling Models - you need to make sure you are referencing a valid resource like a dialog node.