Recreating journal sub classes if Journal was reloaded

vendor/plugins/acts_as_journalized/lib/acts_as_journalized.rb

@@ -85,7 +85,20 @@ module Redmine
         def journal_class
           journal_class_name = "#{name.gsub("::", "_")}Journal"
           if Object.const_defined?(journal_class_name)
-            Object.const_get(journal_class_name)
+            jclass = Object.const_get(journal_class_name)
+            if jclass.superclass == Journal
+              jclass
+            else
+              # We are running into some nasty reloaded things in here. Journal
+              # is a reloaded version, jclass.superclass is an older version
+              # from a previous request.
+              #
+              # So we are just removing the const and triggering ourselves
+              # recursively to create a new up-to-date version of the
+              # journal_class with working superclass pointers.
+              Object.send :remove_const, journal_class_name
+              journal_class
+            end
           else
             Object.const_set(journal_class_name, Class.new(Journal)).tap do |c|
               # Run after the inherited hook to associate with the parent record.