Simple JavaFX app in JRuby

command_lines.txt

java --module-path /Users/headius/Downloads/javafx-sdk-15/lib --add-modules javafx.controls \
        -Djruby.home=`pwd` -cp lib/jruby.jar org.jruby.Main javafx2.rb

jruby -e 'Dir["/Users/headius/Downloads/javafx-sdk-15/lib/*.jar"].each {|f| require f}; load "javafx2.rb"'

javafx.rb

# Java version: https://twitter.com/johanvos/status/1309423474121814017
javafx.application.Platform.startup do
  stage = javafx.stage.Stage.new
  label = javafx.scene.control.Label.new("Hi!")
  pane = javafx.scene.layout.Pane.new(label)
  scene = javafx.scene.Scene.new(pane)

  stage.scene = scene
  stage.show
end