I have just released a pre-release version of JRubyArt-2.1.0. Developed and tested and on 64bit linux, requires testing on MacOS and Windows, does not require an installed version of vanilla processing. To install as a gem:-
gem install jruby_art --pre
k9 --install # to install jruby-complete and samples
cd k9_samples # in home directory
rake # to run examples
Default setup expects jruby-9.2.7.0 to be installed, to use jruby-complete instead edit ~/.jruby_art/config.yml requires jdk11 (openjdk11 is fine).
See https://github.com/ruby-processing/JRubyArt