https://sling.apache.org/apidocs/sling6/org/apache/sling/api/resource/ResourceResolver.html#close()

Either you need to do Session.logout() just to close the session and not the resource, If you are doing ResourceResolver.close() then you dont have to explicitly do session logout. 

Ot you can download the required bundles from [1] and upload to felix console[1] http://mvnrepository.com/artifact/com.cognifide.cq

If you refer the OOB workflow 'DAM Update Asset' workflow, there you can configure which file types should be allowed. Similarly, you can write custom workflowprocess service to check the type and size of the asset and restrict the uploads accordingly.

I think this will return only the ValueMap object and the parent resource object may not be available via this API. refer [1] [2] for more details[1] https://docs.adobe.com/docs/en/cq/5-6-1/javadoc/com/day/cq/commons/inherit/HierarchyNodeInheritanceValueMap.html[2] http://labs.6dglobal.com/blog/2012...

Yes.. You will have to close the session by session.logout()

We should not be using loginAdministrative()when you are using resourceResolver.adaptTo(Session.class)make sure you close resourceResolver in the final block

Can you try replacing your maven bundle plugin as mentioned belowI want to try configuring import package  <plugin>                <groupId>org.apache.felix</groupId>                <artifactId>maven-bundle-plugin</artifactId>                <extensions>true</extensions>                <configuratio...

I know its custom text.jsp but the xtype you are using for RTE is custom or OOB ??can you share your dialog.xml

While I take a look at it, you can download these bundles here [1] and upload it manually from the console and check if that resolves the issue[1] http://mvnrepository.com/artifact/com.fasterxml.jackson.core