jruby - develop & test using jruby interpreter. Compile the code to Java bytecodes and run it straight away

Bar.rb

# encoding: utf-8

require "Foo"

class Bar

  def self.say_hello
    Foo.say_hello
  end

end

p Bar.say_hello

command line

jruby Bar.rb  
-> "Hello world!"

jrubyc Foo.rb
-> Creates Foo.class

jrubyc Bar.rb
-> Creates Bar.class

java -cp .:$GEM_HOME/gems/jruby-jars-1.6.4/lib/jruby-core-1.6.4.jar -Djruby.compat.version=RUBY1_9 Bar
-> "Hello world!"

commandline

jruby Bar.rb  
-> "Hello world!"

jrubyc Foo.rb
-> Creates Foo.class

jrubyc Bar.rb
-> Creates Bar.class

java -cp .:$GEM_HOME/gems/jruby-jars-1.6.4/lib/jruby-core-1.6.4.jar -Djruby.compat.version=RUBY1_9 Bar
-> "Hello world!"

Foo.rb

# encoding: utf-8

class Foo

  def self.say_hello
    "Hello world!"
  end

end