code: protected void createGenerateServiceTicketAction(final Flow flow) {
          val handler = createActionState(flow,
              CasWebflowConstants.STATE_ID_GENERATE_SERVICE_TICKET,
              createEvaluateAction(CasWebflowConstants.ACTION_ID_GENERATE_SERVICE_TICKET));
          createTransitionForState(handler, CasWebflowConstants.TRANSITION_ID_SUCCESS, CasWebflowConstants.STATE_ID_REDIRECT);
          createTransitionForState(handler, CasWebflowConstants.TRANSITION_ID_WARN, CasWebflowConstants.STATE_ID_WARN);
          createTransitionForState(handler, CasWebflowConstants.TRANSITION_ID_AUTHENTICATION_FAILURE, CasWebflowConstants.STATE_ID_HANDLE_AUTHN_FAILURE);
          createTransitionForState(handler, CasWebflowConstants.TRANSITION_ID_ERROR, CasWebflowConstants.STATE_ID_INIT_LOGIN_FORM);
          createTransitionForState(handler, CasWebflowConstants.TRANSITION_ID_GATEWAY, CasWebflowConstants.STATE_ID_GATEWAY_SERVICES_MGMT_CHECK);
      }
docs: Create generate service ticket action.
  
  @param flow the flow