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vitis90
New Participant
November 2, 2018
Solved

JCR event listener is not working in aem 6.4

  • November 2, 2018
  • 15 replies
  • 12115 views

Hi all,

Looks like the JCR event listener in 6.4 is broken. Events dont get triggered at all. Is anyone else facing the same issue? Is there any solution?

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    Best answer by arunpatidar

    Hi Scott,

    It does work with system user as well. But you need JCR repository session in order to get jcr events work.

    Below code works for me.

    aem63app-repo/SampleJCREvent.java at master · arunpatidar02/aem63app-repo · GitHub

    @Reference
    private SlingRepository repository;
    private Session session;
    private ObservationManager observationManager;
    protected void activate(ComponentContext context) throws Exception {
    session = repository.loginService("readService",null);
    observationManager = session.getWorkspace().getObservationManager();
    observationManager.addEventListener(this, Event.PROPERTY_ADDED | Event.PROPERTY_CHANGED, "/content/AEM64App/fr", true, null,
    new String[]{"cq:PageContent","nt:unstructured"} , true);
    logger.info("*************added JCR event listener");
    }

    15 replies

    arunpatidar
    arunpatidar
    New Participant
    May 29, 2019

    Hi,

    I've just checked below example in 6.5, working fine for me.

    I created a system user arch17sysuser, gave CRUD permissions, created mapping with sub service readService

    mapping look like below where com.acc.arch17.arch17.core is bundle symbolic name.

    com.acc.arch17.arch17.core:readService=arch17sysuser

    aem63app-repo/SampleJCREvent.java at master · arunpatidar02/aem63app-repo · GitHub

    Arun Patidar
      K
      karthick1356
      New Participant
      January 11, 2023

      @arunpatidar 

      onEvent method never triggered for me. is it still working for you?

      bcz I followed the same from here:aem63app-repo/SampleJCREvent.java at master · arunpatidar02/aem63app-repo · GitHub.

      I saw the log event that get registered and unregistered.

       

      public void onEvent(EventIterator it) {
          while (it.hasNext()) {
              Event event = it.nextEvent();
              try {
                  logger.info("********INSIDE TRY *****");
                  Property changedProperty = session.getProperty(event.getPath());
                  if (changedProperty.getName().equalsIgnoreCase("jcr:title")
                          && !changedProperty.getString().endsWith("!")) {
                      changedProperty.setValue(changedProperty.getString() + "!");
                      logger.info("*************Property updated: {}", event.getPath());
                      session.save();
                  }
              }
              catch (Exception e) {
                  logger.error(e.getMessage(), e);
              }
          }
      }

       

      arunpatidar
      arunpatidar
      New Participant
      January 11, 2023

      HI @karthick1356 
      Which AEM version are you using?

      Arun Patidar
      ajinkayk6258253
      ajinkayk6258253
      New Participant
      May 29, 2019

      not getting any error. bundle is also active, eventlistner not working. it worked with administrativelogin.but not with servicelogin

        A
        andrija_sm
        New Participant
        March 25, 2021

        It's 2021 Same problem on Cloud AEM when switched to version 2021.3.5087.20210322T071003Z. On version: AEM v2021.1.4794.20210121T150042Z. it was working fine.

        arunpatidar
        arunpatidar
        New Participant
        May 29, 2019

        Hi,

        What error are you getting? Is bundle active?

        Arun Patidar
          ajinkayk6258253
          ajinkayk6258253
          New Participant
          May 29, 2019

          this solution is not  working for 6.5

            smacdonald2008
            smacdonald2008
            New Participant
            November 3, 2018

            Confirmed this output was created:  com.adobe.community.listeners.SimpleResourceListener something has been added : /apps/example/config

            Code:

            package com.adobe.community.listeners;

            import java.util.HashMap;

            import java.util.Map;

            import javax.jcr.Property;

            import javax.jcr.RepositoryException;

            import javax.jcr.Session;

            import javax.jcr.observation.Event;

            import javax.jcr.observation.EventListener;

            import javax.jcr.observation.ObservationManager;

            import org.apache.sling.api.resource.LoginException;

            import org.apache.sling.api.resource.Resource;

            import org.apache.sling.api.resource.ResourceResolver;

            import org.apache.sling.api.resource.ResourceResolverFactory;

            import org.osgi.service.component.annotations.Activate;

            import org.osgi.service.component.annotations.Component;

            import org.osgi.service.component.annotations.Deactivate;

            import org.osgi.service.component.annotations.Modified;

            import org.osgi.service.component.annotations.Reference;

            import org.osgi.service.metatype.annotations.Designate;

            import org.slf4j.Logger;

            import org.slf4j.LoggerFactory;

            import org.osgi.service.component.ComponentContext;

            import javax.jcr.observation.EventIterator ;

            @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);

                  }

                 }

                }

            6.4 article  -- https://helpx.adobe.com/experience-manager/using/aem64_event_listener.html

            smacdonald2008
            smacdonald2008
            New Participant
            November 3, 2018

            that is great! We will create a 6.4 HELXP article and show this code.

            arunpatidar
            arunpatidarAccepted solution
            New Participant
            November 3, 2018

            Hi Scott,

            It does work with system user as well. But you need JCR repository session in order to get jcr events work.

            Below code works for me.

            aem63app-repo/SampleJCREvent.java at master · arunpatidar02/aem63app-repo · GitHub

            @Reference
            private SlingRepository repository;
            private Session session;
            private ObservationManager observationManager;
            protected void activate(ComponentContext context) throws Exception {
            session = repository.loginService("readService",null);
            observationManager = session.getWorkspace().getObservationManager();
            observationManager.addEventListener(this, Event.PROPERTY_ADDED | Event.PROPERTY_CHANGED, "/content/AEM64App/fr", true, null,
            new String[]{"cq:PageContent","nt:unstructured"} , true);
            logger.info("*************added JCR event listener");
            }
            Arun Patidar
              V
              vitis90Author
              New Participant
              November 2, 2018

              hi Scott, even this code didn't work

              adminSession = repository.loginAdministrative(null);

              observationManager = adminSession.getWorkspace().getObservationManager();

              observationManager.addEventListener(this, Event.NODE_ADDED | Event.NODE_MOVED | Event.NODE_REMOVED, "/content/dam/products",true, null, null, false);

                V
                vitis90Author
                New Participant
                November 2, 2018

                I'm getting via subservice and a system user, the usual way.

                  V
                  vitis90Author
                  New Participant
                  November 2, 2018

                  Hi Scott,

                  I'm actually getting a session object in this way, using the subservice and system user. It is the recommended way right? Is there any workaround for this? I wouldn't want to get the session by passing null object because it is not the secure way.

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