in src/main/java/org/apache/sling/jcr/jackrabbit/base/security/MultiplexingAuthorizableAction.java [58:66]
public MultiplexingAuthorizableAction(BundleContext context){
this.context = context;
this.tracker = new ServiceTracker(context, createFilter(context),this);
this.tracker.open();
Hashtable<String, String> properties = new Hashtable<>();
properties.put("jackrabbit.extension","true");
reg = context.registerService(AuthorizableAction.class.getName(),this, properties);
}