You can use below Sling APIs to create and manage a collection -ResourceCollectionManager ("The Adobe AEM Quickstart and Web Application.") ResourceCollection ("The Adobe AEM Quickstart and Web Application.")

The error can occur in case of a node reorder event as the node reorder event doesn't have source path. For e.g. the error might occur while activating a page and it's referenced assets.

By default only admin user has access to the Felix console. You can add more users/groups from the config : /system/console/configMgr/org.apache.sling.extensions.webconsolesecurityprovider.internal.SlingWebConsoleSecurityProviderAlso note that OSGi Console doesn't have any notion of RBAC (Role-based_access_control) – once you have access to it, you can do everything.