We are using a Jenkins Shared Library to centralize some code for all our (scripted) pipelines. Now we factored out some Groovy code into a `.jar` library (written in Kotlin, compiled to be Java 8 compatible). We published this library to our in-house maven repo and now want to use it in our Shared Libary.

We are using `@Grab` to load our library and up until that point it works like a charm. However we are getting `NoSuchMethodError`'s. We pinpointed it down a bit, we are using OkHttp in our Kotlin lib. OkHttp internally uses Okio. When we call methods that internally call OkHttp-Code from our pipeline, everything is fine. However when the OkHttp-Code call Okio internally, we get a `NoSuchMethodError`.

We already checked the published `.jar` file, it contains the classes with the methods that seem to be missing. Does anybody have an idea what the issue could be?

While we are at it, we can't access environment variables set on Jenkins in our Kotlin library, is there a way we can fix this?