Usage of asset processing library apis from AEMaaCS

[Mshaji]

I am using following code for getting resourceResolver ResourceResolver resolver = this.resolverFactory.getServiceResourceResolver(AssetComputeConstants.AUTH_INFO);

this code is in my custom core  bundle com.xxxx.mycore it is returning org.apache.sling.api.resource.LoginException: Cannot derive user name for bundle com.xxxx.mycore [663] and sub service createrendition

I don't have user mapping as AssetComputeConstants.AUTH_INFO is in different bundle com.adobe.cq.dam.cq-dam-processor-nui. This bundle is available from adobe  asset processing library bundle for aws, dropbox, gcp, azure. I need to utilize the mapping services and apis from adobe's bundle in my custom bundle.

I tried to create a user mapping  link this service mapping between my bundle and adobe using service in cfg.json 

"com.xxxx.mycore:createrendition=[com.adobe.cq.dam.cq-dam-processor-nui]"

How do we use the mapping service and getResourceResolver from other bundles for our custom development in core bundle. 

[Jörg_Hoh]

Why do you want to use an existing service-user for code of your own? 

[MohammedSh6]

@Jörg_Hoh  I am trying to utilize the adobe code and services if its already available rather than reinventing wheel. I see that adobe artifact cq-dam-processor-nui   is declared in bundle with Private-Package. It is not publicly available in maven repo, it is adobe private repo in https://git.corp.adobe.com/CQ/dam/tree/master/bundles/processor-nui

Jar is available in console bundles, can we download jar and add to maven and use it. What is the best approach?