Level 3

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JCR event listener is not working in aem 6.4

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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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arunpatidarAccepted solution

New Participant

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

arunpatidar

New Participant

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

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Arun Patidar

K

karthick1356

Level 4

@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);
        }
    }
}

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arunpatidar

New Participant

HI @karthick1356
Which AEM version are you using?

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Arun Patidar

ajinkayk6258253

Level 3

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

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A

andrija_sm

Level 2

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.

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arunpatidar

New Participant

Hi,

What error are you getting? Is bundle active?

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Arun Patidar

ajinkayk6258253

Level 3

this solution is not working for 6.5

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smacdonald2008

Level 10

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

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smacdonald2008

Level 10

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

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arunpatidarAccepted solution

New Participant

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");
	}

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Arun Patidar

V

vitis90Author

Level 3

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);

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V

vitis90Author

Level 3

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

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V

vitis90Author

Level 3

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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