code: protected void createDefaultGlobalExceptionHandlers(final Flow flow) {
          val h = new TransitionExecutingFlowExecutionExceptionHandler();
          h.add(UnauthorizedSsoServiceException.class, CasWebflowConstants.STATE_ID_VIEW_LOGIN_FORM);
          h.add(NoSuchFlowExecutionException.class, CasWebflowConstants.STATE_ID_VIEW_SERVICE_ERROR);
          h.add(UnauthorizedServiceException.class, CasWebflowConstants.STATE_ID_SERVICE_UNAUTHZ_CHECK);
          h.add(UnauthorizedServiceForPrincipalException.class, CasWebflowConstants.STATE_ID_SERVICE_UNAUTHZ_CHECK);
          h.add(PrincipalException.class, CasWebflowConstants.STATE_ID_SERVICE_UNAUTHZ_CHECK);
          flow.getExceptionHandlerSet().add(h);
      }
docs: Create default global exception handlers.
  
  @param flow the flow