ResourceChangeListener onChange event not getting trigger | Community
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kranthivulpe
Level 2
April 23, 2019

ResourceChangeListener onChange event not getting trigger

  • April 23, 2019
  • 1 reply
  • 8807 views

Hi All,

the following code for onChange used to work in AEM 6.2 but after we migrated to 6.3 , I see onChange is not getting fired, not sure what is going wrong.

@Component(immediate = true)

@Service
@Properties(value = { @Property(name = ResourceChangeListener.PATHS, value = { CommunityConstants.CONTENT_ROOT_PATH }),

   @Property(name = ResourceChangeListener.CHANGES, value = { "ADDED", "CHANGED" }, propertyPrivate = true) })

public class xyz implements ResourceChangeListener {

@Reference
private ResourceResolverFactory resourceResolverFactory;

@Reference
private ContentModelService contentModelService;

@Override
public void onChange(@Nonnull List<ResourceChange> changes) {

//some logic here

}

}

Please help me to understand it further.

Many Thanks,

Kranthi

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    1 reply

    joerghoh
    Adobe Employee
    joerghohAdobe Employee
    Adobe Employee
    April 23, 2019

    Some basic checks first:

    * Please check that the bundle containing this service is active.

    * Please check that the component "xyz" is active (check on the Components list in the OSGI webconsole).

    Jörg

      smacdonald2008
      smacdonald2008
      Level 10
      April 23, 2019

      Issue is how session is obtained. You need to use a system user and give correct permissions. This works....

      Component(immediate=true,

      service= EventListener.class)

      public class SimpleResourceListener implements EventListener{

       

          Logger log = LoggerFactory.getLogger(this.getClass());

           private Session adminSession;

           

          

           @Reference

           org.apache.sling.jcr.api.SlingRepository repository;

           

           @Activate

           public void activate(ComponentContext context) throws Exception {

           log.info("activating ExampleObservation");

           try {

               adminSession = repository.loginService("datawrite",null);

               adminSession.getWorkspace().getObservationManager().addEventListener(

                this, //handler

                Event.PROPERTY_ADDED|Event.NODE_ADDED, //binary combination of event types

                "/apps/example", //path

                true, //is Deep?

                null, //uuids filter

                null, //nodetypes filter

                false);

           

               

           } catch (RepositoryException e){

            log.error("unable to register session",e);

            throw new Exception(e);

           }

          }

          @Deactivate

          public void deactivate(){

           if (adminSession != null){

            adminSession.logout();

           }

          }

           

          public void onEvent(EventIterator eventIterator) {

            try {

              while (eventIterator.hasNext()){

                log.info("something has been added : {}", eventIterator.nextEvent().getPath());

              }

             } catch(RepositoryException e){

             log.error("Error while treating events",e);

            }

           }

          }

        arunpatidar
        Community Advisor
        arunpatidarCommunity Advisor
        Community Advisor
        April 25, 2019

        smacdonald2008​, yes we are using 6.3 Uber JAR file. onChange event is getting triggerd but I see problem in getting the ResourceResolver

        I created the system user too

        1. Create one system user from /crx/explorer console
        2. Give access permissions  from /useradmin console
        3. Go to /system/console/configMgr and search for User Mapper Service
        4. Add your bundles:systemUser:systemUser

        now write a method to get the resolver

        public static final String CONTENT_ENGINE_SERVICE = "systemUser";

        @Reference
        private ResourceResolverFactory resourceResolverFactory;

        private ResourceResolver getResourceResolver() {

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

          param.put(ResourceResolverFactory.SUBSERVICE, CONTENT_ENGINE_SERVICE);

          ResourceResolver resolver = null;

           try {

          resolver = resolverFactory.getServiceResourceResolver(param);

          } catch (Exception e) {

           LOG.error("Exception", e);

          }

           return resolver;

        }

        but I am not getting the ResourceResolver. not sure what is going wrong.

        when I install the bundle, I see the following error in the error.log file

        1.  bind method [bindResolverFactory] not found; Component  will fail

        2. org.apache.sling.resourceresolver FrameworkEvent ERROR (java.lang.NullPointerException)

        25.04.2019 05:58:40.625 *ERROR* [Background Update com.xyz.help.content-engine-core-bundle (833)] com.xyz.help.content-engine-core-bundle [                                                                      com.xyz.help.conteenginecore.listener.GenerateArticleIdOnAddingArticleNumber(3787)] bind method [bindResolverFactory] not found; Component                                                                       will fail

        25.04.2019 05:58:40.625 *ERROR* [Background Update com.xyz.help.content-engine-core-bundle (833)] com.xyz.help.content-engine-core-bundle [                                                                      com.xyz.help.conteenginecore.listener.GenerateArticleIdOnAddingArticleNumber(3787)] bind method [bindResolverFactory] not found

        25.04.2019 05:58:41.621 *ERROR* [FelixDispatchQueue] org.apache.sling.resourceresolver FrameworkEvent ERROR (java.lang.NullPointerExcepti                                                                      on)

        java.lang.NullPointerException: null


        Can you share your Apache Sling Service User Mapper service configuration:

        It should be in below format because in point 4 above you shared is not correct format

        Correct Format is below:

        service-name:[sub-service-name]=system-user


        Service-name: The service-name is the symbolic name of the bundle providing the service.

        Sub-Service-Name:A Service may be comprised of multiple parts, so each part of the service may be further identified by a Subservice Name. This field is optional.

        System-User :This will be the name of system user having access to get the resource.

        com.demo.aem:dataService=dataUser

        Arun Patidar
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