JRuby Prism - A new parser for a new era Thomas E. Enebo - Feb 23, 2024 Introduction JRuby has added support for the new backend parser Prism via the gem: jruby-prism-parser. Installing this gem will give you access to enable Prism (export JRUBY_OPTS="-Xparser.prism"). At this stage jruby-prism-parser is at the technology preview stage but capable of running pretty much everything: Rake, RSpec, Ru