Workaround jruby issue with protected module attr_accessor showing up as public in included class

actionpack/lib/action_controller/test_case.rb

@@ -127,9 +127,14 @@ module ActionController
     #
     # The exception is stored in the exception accessor for further inspection.
     module RaiseActionExceptions
-      protected
-        attr_accessor :exception
+      def self.included(base)
+        base.class_eval do
+          attr_accessor :exception
+          protected :exception, :exception=
+        end
+      end
 
+      protected
         def rescue_action_without_handler(e)
           self.exception = e