5 files changed, 12 insertions, 8 deletions
diff --git a/railties/lib/initializer.rb b/railties/lib/initializer.rb
index b3b409dc4d..1bd7baed62 100644
--- a/railties/lib/initializer.rb
+++ b/railties/lib/initializer.rb
@@ -5,12 +5,9 @@ require 'pathname'
 $LOAD_PATH.unshift File.dirname(__FILE__)
 require 'railties_path'
 require 'rails/version'
-require 'rails/plugin/locator'
-require 'rails/plugin/loader'
 require 'rails/gem_dependency'
 require 'rails/rack'
 
-
 RAILS_ENV = (ENV['RAILS_ENV'] || 'development').dup unless defined?(RAILS_ENV)
 
 module Rails
@@ -244,6 +241,7 @@ module Rails
     # Set the paths from which Rails will automatically load source files, and
     # the load_once paths.
     def set_autoload_paths
+      require 'active_support/dependencies'
       ActiveSupport::Dependencies.load_paths = configuration.load_paths.uniq
       ActiveSupport::Dependencies.load_once_paths = configuration.load_once_paths.uniq
 
@@ -263,6 +261,8 @@ module Rails
     # list. By default, all frameworks (Active Record, Active Support,
     # Action Pack, Action Mailer, and Active Resource) are loaded.
     def require_frameworks
+      require 'active_support'
+      require 'active_support/core/all'
       configuration.frameworks.each { |framework| require(framework.to_s) }
     rescue LoadError => e
       # Re-raise as RuntimeError because Mongrel would swallow LoadError.
@@ -289,10 +289,12 @@ module Rails
     # Adds all load paths from plugins to the global set of load paths, so that
     # code from plugins can be required (explicitly or automatically via ActiveSupport::Dependencies).
     def add_plugin_load_paths
+      require 'active_support/dependencies'
       plugin_loader.add_plugin_load_paths
     end
 
     def add_gem_load_paths
+      require 'rails/gem_dependency'
       Rails::GemDependency.add_frozen_gem_path
       unless @configuration.gems.empty?
         require "rubygems"
@@ -1037,12 +1039,14 @@ Run `rake gems:install` to install the missing gems.
       end
 
       def default_plugin_locators
+        require 'rails/plugin/locator'
         locators = []
         locators << Plugin::GemLocator if defined? Gem
         locators << Plugin::FileSystemLocator
       end
 
       def default_plugin_loader
+        require 'rails/plugin/loader'
         Plugin::Loader
       end
 
diff --git a/railties/lib/rails/backtrace_cleaner.rb b/railties/lib/rails/backtrace_cleaner.rb
index 923ed8b31d..1605429e8b 100644
--- a/railties/lib/rails/backtrace_cleaner.rb
+++ b/railties/lib/rails/backtrace_cleaner.rb
@@ -1,3 +1,6 @@
+require 'active_support/backtrace_cleaner'
+require 'rails/gem_dependency'
+
 module Rails
   class BacktraceCleaner < ActiveSupport::BacktraceCleaner
     ERB_METHOD_SIG = /:in `_run_erb_.*/
diff --git a/railties/lib/rails/plugin.rb b/railties/lib/rails/plugin.rb
index bc28bec57e..0f924724cd 100644
--- a/railties/lib/rails/plugin.rb
+++ b/railties/lib/rails/plugin.rb
@@ -1,8 +1,3 @@
-require 'active_support'
-require 'active_support/core_ext/kernel/reporting'
-require 'active_support/core_ext/symbol'
-require 'active_support/dependencies'
-
 module Rails
   # The Plugin class should be an object which provides the following methods:
   #
diff --git a/railties/test/boot_test.rb b/railties/test/boot_test.rb
index 08fcc82e6f..2dd68857c3 100644
--- a/railties/test/boot_test.rb
+++ b/railties/test/boot_test.rb
@@ -1,6 +1,7 @@
 require 'abstract_unit'
 require 'initializer'
 require "#{File.dirname(__FILE__)}/../environments/boot"
+require 'rails/gem_dependency'
 
 class BootTest < Test::Unit::TestCase
   def test_boot_returns_if_booted
diff --git a/railties/test/gem_dependency_test.rb b/railties/test/gem_dependency_test.rb
index d9cd5148a3..da7bda9bee 100644
--- a/railties/test/gem_dependency_test.rb
+++ b/railties/test/gem_dependency_test.rb
@@ -1,4 +1,5 @@
 require 'plugin_test_helper'
+require 'rails/gem_dependency'
 
 class Rails::GemDependency
   public :install_command, :unpack_command