Simplified JRuby plugin 2.2.0 is out with one headline feature. It has first class support for

<http://gem.coop|gem.coop>

. If this is your thing, just use

<http://ruby.coop|ruby.coop>()

instead of

ruby.gems()

https://jruby-gradle.ysb33r.org/jruby-simple/2.2.0/rubygem-repositories.html#_customising_gem_repositories P.S. For Asciidoctor Gradle people, this will be in the 5.0.0-alpha.2 release.