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S
sagarv13144480
Level 2
September 27, 2019
Solved

TagManager.getNameSpaces giving null

  • September 27, 2019
  • 10 replies
  • 5964 views

Hi Experts,

Whenever I am trying to do TagManager.getNameSpaces()
or TagManager.getTags(resource)

I am getting null pointer Exception.

My Tags are present under /content/cq:tags/

Also I have installed Service Pack 6.4.3

Also  resourceResolver is having readSystem as subservice.

Can you anyone help on this?

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Best answer by ArpitVarshney

Hi sagarv13144480 ,

As you're using the service user to read the tags.Can you please make sure the below things:

  • After creating the service user , you need to add an entry in the “Apache Sling Service User Mapper Service”. This entry is to allow your bundle to access the permissions of the system user.Go to Configuration Manager in the system console and search for “User Mapper Service”

          <bundle symbolic name>:<any name of service>=<system user id>

         Reference: How to get Service Resource Resolver? – Rahul Mengji

  • Check whether the service user has read permission to appropriate folder(/content/cq:tags).Please verify this on  http://<host>:port/useradmin URL and search for service user and check the permissions

10 replies

arunpatidar
Community Advisor
arunpatidarCommunity Advisor
Community Advisor
September 27, 2019

Hi,

Can you please check if resourceResolver is not null?

If it is not null, then you can do

TagManager tm = resourceResolver.adaptTo(TagManager.class)

tm.getNameSpaces()

TagManager ("The Adobe AEM Quickstart and Web Application.")

Arun Patidar
    S
    sagarv13144480Author
    Level 2
    September 28, 2019

    Hi Arun,

    resourceResolver is not null and I am doing the same as suggested by you hence confused.

    Is it a bug?

      joerghoh
      Adobe Employee
      joerghohAdobe Employee
      Adobe Employee
      September 29, 2019

      How have you acquired the TagManager? What kind of resource resolver are you using?

        S
        sagarv13144480Author
        Level 2
        September 30, 2019

        Hi

        resourceResolver = resourceResolverFactory.getServiceResourceResolver(Map having readSystem subservice)

        Resource resource = resourceResolver.getResource("/content/cq:Tags");

        TagManager tagMgr = resource.adaptTo(TagManager.class);

        Tag[] Tags = tagMgr.getNamespaces();

          joerghoh
          Adobe Employee
          joerghohAdobe Employee
          Adobe Employee
          October 1, 2019

          In which statement do you get the NPE? Please ensure that you check the return value of the adaptTo() call. But also resourceResolver.getResource() can return null if the resource does not exist.

          Does your service user have read permission on /content/cq:tags?

            BrijeshYadav
            BrijeshYadav
            Level 5
            October 2, 2019

            At line number 3.

            adapt TagManager from ResourceResolver instead of Resource.

            TagManager tagManager = resourceResolver.adaptTo(TagManager.class);

              joerghoh
              Adobe Employee
              joerghohAdobe Employee
              Adobe Employee
              October 4, 2019

              To see the full list of available adaptions please check [1].

              [1] localhost:4502/system/console/adapters

                joerghoh
                Adobe Employee
                joerghohAdobe Employee
                Adobe Employee
                October 4, 2019

                A resource can also be adapted to the TagManager.

                  R
                  ragulmsd
                  October 9, 2019

                  Hi,

                  I think its because, the sling request is not sent in your servlet.I also faced the same issue.Try using sling request in resource resolver.I Hope it will work.

                  private static final String tagid = "/content/cq:tags/properties";

                  TagManager tagManager = slingRequest.getResourceResolver().adaptTo(TagManager.class);

                  Tag tag = tagManager.resolve(tagid);

                  Resource resource = slingRequest.getResourceResolver().getResource(tagid);

                  Tag[] pagetag = tagManager.getTags(resource);

                  out.print(tag.getNamespace());

                    ArpitVarshney
                    Community Advisor
                    ArpitVarshneyCommunity AdvisorAccepted solution
                    Community Advisor
                    October 9, 2019

                    Hi sagarv13144480 ,

                    As you're using the service user to read the tags.Can you please make sure the below things:

                    • After creating the service user , you need to add an entry in the “Apache Sling Service User Mapper Service”. This entry is to allow your bundle to access the permissions of the system user.Go to Configuration Manager in the system console and search for “User Mapper Service”

                              <bundle symbolic name>:<any name of service>=<system user id>

                             Reference: How to get Service Resource Resolver? – Rahul Mengji

                    • Check whether the service user has read permission to appropriate folder(/content/cq:tags).Please verify this on  http://<host>:port/useradmin URL and search for service user and check the permissions
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