Jruby and Spork

When you try run spork you have to enable fork for spork (instead you will have error

spork/forker.rb:18:in `initialize': fork is unsafe and disabled by default on JRuby (NotImplementedError)

). So it should like:

jruby -J-Djruby.fork.enabled=true <path-to-jruby-binaries>/spork