Welcome to the Jazz Community Forum
extending EWM with Custom Widget interacting with Custom Server Extension

Hi all,
Accepted answer

It is possible to expose a custom service, as far as I know using the extension point com.ibm.team.repository.service.serviceProvider .
Comments

Is there some tutorial or architecture doc available about concepts for doing mulithreading in an AbstractService extension to avoid blocking the whole Jazz server (e.g. implementing some workflow process)?

I do not know. You would have to search the SDK. The code uses runnables and there is also a job concept. It is also possible to elevate permission to administrative level.

when running the custom widget in context of the logged in user, and widget calls a method in the custom AbstractService via exposed interface, in which permission context will the server method run?
