gistfile1.rb

require 'rbconfig'
require 'java'
require '../../tool/signature'

class MyRubyClass
  def helloWorld
    puts "Hello from Ruby"
  end

  def goodbyeWorld(a,b="JRuby")
    puts b+a
  end

  signature :helloWorld, [] => Java::void
  signature :goodbyeWorld, [java.lang.String,java.lang.String.optional] => Java::void
end