LoadError: no such file to load -- rubygems
  require at org/jruby/RubyKernel.java:944
    <top> at <script>:9
org.jruby.embed.EvalFailedException: (LoadError) no such file to load -- rubygems
    at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:131)
    at org.jruby.embed.jsr223.JRubyEngine.eval(JRubyEngine.java:118)
    at burp.il.<init>(Unknown Source)
    at burp.hog.a(Unknown Source)
    at burp.adb.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- rubygems
    at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:944)
    at RUBY.<top>(<script>:9)

/usr/local/Cellar/jruby/9.1.2.0/libexec/lib/ruby/stdlib/rubygems
/usr/local/Cellar/jruby/9.1.2.0/libexec/lib/ruby/truffle/mri/rubygems
/usr/local/Cellar/jruby/9.1.2.0/libexec/lib/ruby/truffle/stdlib/rubygems
/usr/local/Cellar/jruby/9.1.2.0/libexec/lib/ruby/truffle/truffle/rubygems

MacBook-Pro:gems july$ which Ruby
/usr/bin/Ruby
MacBook-Pro:gems july$ Which Jruby
/usr/local/bin/Jruby
MacBook-Pro:gems july$ which gem
/usr/bin/gem