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AEM 6.3 ResourceProvider resourceResolve.getResource always returns null

Forum|Forum|8 years ago
August 21, 2017
11 replies
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I am having trouble solving the following issue: I have a ResourceProvider with a root mapped at '/synthetic/config'. In the getResource() method I retrieve the resourceResolver and try to fetch the resource (this resource does exists!) but this never succeeds, I always get a 'null'.

Here is my code (I based mine on https://svn.apache.org/repos/asf/sling/trunk/launchpad/test-services/src/main/java/org/apache/sling/launchpad/testservic… ):

@Component
@Service(value=ResourceProvider.class)
@Properties({
        @Property(name = ResourceProvider.PROPERTY_NAME, value = "Planets"),
        @Property(name = ResourceProvider.PROPERTY_ROOT, value= ConfigResourceProvider.SYNTHETIC_CONFIG_ROOT)
})
public class ConfigResourceProvider extends ResourceProvider<ConfigResourceProvider.DoesNotNeedAContext> {
    public static final String SYNTHETIC_CONFIG_ROOT = "/synthetic/config";
    @Override
    public Resource getResource(ResolveContext<DoesNotNeedAContext> resolveContext, String s, ResourceContext resourceContext, Resource resource) {
        Resource resource1 = resolveContext.getResourceResolver().getResource("/content/we-retail");
        return null;
    }
    @Override
    public Iterator<Resource> listChildren(ResolveContext<DoesNotNeedAContext> resolveContext, Resource resource) {
        return null;
    }
    /** If this provider required a context this would be more elaborate,
     *  but for this simple example we don't need one.
     */
    public static class DoesNotNeedAContext {
    };
}

How can I fix this? Thanks in advance!

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Best answer by smacdonald2008

IS that the value that appears when you open the Manifest file in the bundle? You need to make sure they match exactly. Also make sure the system user has the correct permissions. These are 2 things that can explain the null.

smacdonald2008

Level 10

You need to use a System user and Sling Mapping as you do when you get a Session object.

J

JeroenDruweAuthor

Level 4

smacdonald2008 I have a service user and the 'Apache Sling Service User Mapper Service' has the default user set to this user. Am I missing something?

smacdonald2008

Level 10

You are missing the code required to create a ResourceResolver. I did not see it in that link.

Map<String, Object> param = new HashMap<String, Object>();

param.put(ResourceResolverFactory.SUBSERVICE, "datawrite");

ResourceResolver resolver = null;

try {

//Create a valid ResourceResolver

resolver = resolverFactory.getServiceResourceResolver(param);

.

See this article -- Scott's Digital Community: Querying Adobe Experience Manager 6 data using the Sling getServiceResourceResolver method

Ratna_Kumar

Level 10

Hey,

Scott is right. In order to create ResourceResolver, you have to use mentioned code:

Map<String, Object> param = new HashMap<String, Object>();

param.put(ResourceResolverFactory.SUBSERVICE, "datawrite");

ResourceResolver resolver = null;

try {

//Create a valid ResourceResolver

resolver = resolverFactory.getServiceResourceResolver(param);

~Ratna

J

JeroenDruweAuthor

Level 4

I added the following line in the 'Apache Sling Service User Mapper Service':

aem-company-platform-core-bundle:datawrite=platform-company-service (NOTE: aem-company-platform-core-bundle is the symbolic bundle name)

And I have the following code:

//Inject a Sling ResourceResolverFactory
@Reference
private ResourceResolverFactory resolverFactory;
@Override
public Resource getResource(ResolveContext<DoesNotNeedAContext> resolveContext, String s, ResourceContext resourceContext, Resource resource) {
    Map<String, Object> param = new HashMap<String, Object>();
    param.put(ResourceResolverFactory.SUBSERVICE, "datawrite");
    ResourceResolver resolver = null;
    //Create a valid ResourceResolver
    try {
        resolver = resolverFactory.getServiceResourceResolver(param);
        Resource thisResouceIsNull = resolver.getResource("/content/we-retail");
    } catch (LoginException e) {
        e.printStackTrace();
    }
    return null;
}

I still get null If I try to get a resource using that resolver:

Is something still missing?

smacdonald2008

Level 10

Post screen shot of the Sling Mapping Service. Make sure you are specifying the correct Symbolic Bundle name in that service.

J

JeroenDruweAuthor

Level 4

Mapper service: Apache Sling Service User Mapper Service - Album on Imgur

Bundle that contains the class: Bundle - Album on Imgur

System User: System User - Album on Imgur

smacdonald2008Accepted solution

Level 10

IS that the value that appears when you open the Manifest file in the bundle? You need to make sure they match exactly. Also make sure the system user has the correct permissions. These are 2 things that can explain the null.

J

JeroenDruweAuthor

Level 4

I was missing the correct permission, thank you very much both of you!