UpgradeManager has a major liability in the way it instantiates classes

            while (actions.hasMoreElements())
            {
                final Element action = (Element) actions.nextElement();
                final String className = action.getElement("class").getTextString();
                try
                {
                    final UpgradeTask task = (UpgradeTask) JiraUtils.loadComponent(className, this.getClass());

                  .....
                    }
                }
                catch (final Exception e)
                {
                    log.error("Exception loading type: " + className, e);
                }
            }
        }