initial_context.rb

if RUBY_PLATFORM == "java"
  require 'java'
  module JndiProperties
    java_import javax.naming.InitialContext

    def self.getProperty(name)
      begin
        env.lookup(name).to_s
      rescue
        nil
      end
    end

    def self.[](name)
      getProperty(name)
    end

    private
    def self.env
      context = InitialContext.new
      
      puts "initial context = #{context}"

      environment = context.lookup 'java:comp/env'
      environment
    end
  end
else
  module JndiProperties
    def self.getProperty(name)
      nil
    end

    def self.[](name)
      getProperty(name)
    end
  end
end

puts JndiProperties['ANTARCTICLE_DB_USER'].inspect

# output from jruby initial_context.rb :
# $ initial context = javax.naming.InitialContext@9d2f333
# $ nil