Rework the dependencies and some of the code to support retro rubies better

Gemfile

@@ -5,6 +5,8 @@ gemspec
 group :development do
   gem 'jbundler', :platform => :jruby
   gem 'rake'
+  gem 'i18n', '~> 0.6.11', :platform => :mri_18
+  gem 'activesupport', '~> 3.x', :platform => :mri_18
   gem 'ruby-maven', '~> 3.1.1.0', :platform => :jruby
   gem 'jar-dependencies', :platform => :jruby
   gem 'rake-compiler'

hermann.gemspec

@@ -24,10 +24,12 @@ Gem::Specification.new do |s|
   s.rubygems_version = '2.2.2'
   s.specification_version = 3 if s.respond_to?(:specification_version)
 
-  s.add_dependency 'concurrent-ruby', '~> 0.7.0'
+  s.add_dependency 'json', '~> 1.8.2'
   s.add_dependency 'thread_safe', '~> 0.3.4'
 
   if RUBY_PLATFORM == "java"
+    s.add_dependency 'concurrent-ruby', '~> 0.7.0'
+
     # IMPORTANT: make sure that jar-dependencies is only a development
     # dependency of your gem. if it is a runtime dependencies the require_jars
     # file will be overwritten during installation.

lib/hermann/java.rb

@@ -1,6 +1,7 @@
 module Hermann
   require 'java'
   require 'hermann_jars'
+  require 'concurrent'
 
   module JavaUtil
     include_package 'java.util'

lib/hermann/provider/java_producer.rb

@@ -1,6 +1,5 @@
-require 'hermann'
-require 'concurrent'
 require 'json'
+require 'hermann'
 require 'hermann/errors'
 
 module Hermann

spec/consumer_spec.rb

@@ -55,7 +55,7 @@ describe Hermann::Consumer do
   end
 
   context 'on Jruby', :platform => :java do
-    subject(:consumer) { described_class.new(topic, group_id: groupId, zookeepers: zookeepers) }
+    subject(:consumer) { described_class.new(topic, :group_id => groupId, :zookeepers => zookeepers) }
 
     let(:zookeepers) { 'localhost:2181' }
     let(:groupId)    { 'groupId' }

spec/integration/producer_spec.rb

@@ -3,12 +3,12 @@ require 'spec_helper'
 require 'hermann/producer'
 require 'hermann/consumer'
 require 'hermann/discovery/zookeeper'
-require 'concurrent'
 
 require 'protobuf'
-require_relative '../fixtures/testevent.pb'
 
-describe 'producer' do
+require 'spec/fixtures/testevent.pb'
+
+describe 'producer', :platform => :java  do
   include_context 'integration test context'
 
   let(:timeout) { 10 }