@Override
    public Event handle(final AuthenticationException exception, final RequestContext requestContext) {
        val id = handleAuthenticationException(exception, requestContext);
        WebUtils.trackFailedAuthenticationAttempt(requestContext);
        return EVENT_FACTORY.event(this, id);
    }
Ordered list of error classes that this class knows how to handle.
core/cas-server-core-webflow-api/src/main/java/org/apereo/cas/web/flow/authentication/DefaultCasWebflowAuthenticationExceptionHandler.java