Currently 1.12 EnderIO is not on any maven. Could we somehow make this work properly? I am in touch with the EnderIO Devs to figure out a solution for this.

Actually I have already removed EnderIO dependency and Jenkins works fine since then. However, the most recent build on Travis has failed due to some unresolved dependencies (HERE). I'm going to look into it soon.

SleepyTrousers/EnderIO-1.5-1.12#4856

And I will take a look at Jenkins, apparently they deprecate the old service integration. Moved it to the new github app. Lets see if this works in the future.

EnderIO has merged the commit, so you can get the newer versions (nightly builds) via their maven.