Environment JRuby version (jruby -v) and command line (flags, JRUBY_OPTS, etc) $ jruby -v jruby 9.2.1.0-SNAPSHOT (2.5.0) 2018-07-31 cbccb8d Java HotSpot(TM) 64-Bit Server VM 25.181-b13 on 1.8.0_181...