Sling-based ResourceChangeListener

With AEM 6.2, a new sling observation support has been provided. The Sling alternative, called “ResourceChangeListener” is only recommended for resource change events. Non-resource events (ex. Workflow events), should be handled via Sling Event Handlers.

For more parameters to help resolve the choice between listener and sling events, refer to link

Benefits of ResourceChangeListener:

  • Avoid long-lived sessions.
  • Avoid Oak observation queue size issues.

Sample Implementation:

@Component(immediate = true)
@Service(value = ResourceChangeListener.class)
@Properties(value = {
@Property(name = ResourceChangeListener.PATHS, value = { "/content/techrevel/intranet" }),
@Property(name = ResourceChangeListener.CHANGES, value = { "CHANGED", "ADDED"}, propertyPrivate=true)
public class PropertyMergeListener implements ResourceChangeListener {

    private ResourceResolverFactory resourceResolverFactory;

    * Called when a resource is added/deleted/modified in Target path
    * @param resourceChangeList List of resource Changes identified by Listener
    public void onChange(List<ResourceChange> resourceChangeList) {
        Map<String, Object> param = new HashMap<String, Object>();
        param.put(ResourceResolverFactory.SUBSERVICE, "SubServiceName");
        ResourceResolver resourceResolver = null;
        try {
            resourceResolver = resourceResolverFactory.getServiceResourceResolver(param);

            for (ResourceChange resourceChange : resourceChangeList) {
                String resourcePath = resourceChange.getPath();
                Resource resource = resourceResolver.getResource(resourcePath);


One thought on “Sling-based ResourceChangeListener

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s