private void registerMultifactorFlowExceptionHandlers(final Flow mfaFlow) {
        createViewState(mfaFlow, CasWebflowConstants.STATE_ID_VIEW_WEBFLOW_CONFIG_ERROR, CasWebflowConstants.VIEW_ID_WEBFLOW_CONFIG_ERROR);
        val handler = new TransitionExecutingFlowExecutionExceptionHandler();
        handler.add(NoMatchingTransitionException.class, CasWebflowConstants.STATE_ID_VIEW_WEBFLOW_CONFIG_ERROR);
        mfaFlow.getExceptionHandlerSet().add(handler);
    }
The flow definition registry for the mfa flow.
core/cas-server-core-webflow-mfa-api/src/main/java/org/apereo/cas/web/flow/configurer/AbstractCasMultifactorWebflowConfigurer.java