Requires JRUBY!!!! This little thing helps us lazy people in connecting java and ruby classes. Pop the javable.rb into your lib and include it where ever you want to use it. this GITS includes: the javable.rb => does all the work the javable_init.rb => helps you initialize and have this injected into whatever (see instructions at the end of the …

bridge.rb

require 'javable'

#this example uses neo4j.rb. 
class Bridge < Neo4j::Rails::Model
  include Javable
  require_jar_folder #by default imports all .jar files from lib/
  
  def initialize
    super
    #Create a ruby instance from the full java class name
    @instance_of_java = javable("com.wikibrains.core.SomeSmartJavaClass").new
  end

  def get_me_some_smart_answers(a)
    #invoke on a method
    @instance_of_java.getSmart a
  end

end

javable.rb

# MIT License
# written by one lazy-eye developer for Wikibrains.com
require 'java'

module Javable
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def require_jar_folder lib_folder="lib"
      jar_folder = File.expand_path("#{Rails.root}/#{lib_folder}", __FILE__)
      jars = Dir.new(jar_folder).entries.find_all { |x| x =~ /\.jar$/ }
      jars.each { |jar| require File.expand_path(jar, jar_folder) }
      
      class_eval "include Javable::InstanceMethods"
    end

  end

  module InstanceMethods
    def javable full_java_name
      name_a = full_java_name.split(".")
      class_name = name_a.pop
      package_name = name_a.join("_").camelize
      eval "Java::#{package_name}::#{class_name}"
    end
  end
end
# Optional: to push this automaticly into all the models etc.
# unmark this line: 
#Neo4j::Rails::Model.send(:include, Javable)

#and then include this file in an initializer 
# refere to next file:

javable_init.rb

require "javable"