code: @Bean(name = "requestAdditionalDescriptors")
      public IAdditionalDescriptors getRequestAdditionalDescriptors() {
          final MediatingAdditionalDescriptors rslt = new MediatingAdditionalDescriptors();
          final List<IAdditionalDescriptors> delegateDescriptors = new ArrayList<>();
          delegateDescriptors.add(getSessionScopeAdditionalDescriptors());
          delegateDescriptors.add(getRequestScopeAdditionalDescriptors());
          rslt.setDelegateDescriptors(delegateDescriptors);
          return rslt;
      }
docs: Session-scoped descriptors object. One of these will exist for each user in their session. It
  will store the attributes from the request set by the requestAttributeSourceFilter. This must
  hold both a session-scoped bean and request-scoped bean. See
  http://permalink.gmane.org/gmane.comp.java.jasig.uportal/10771 for more information.