static CasBanner getInstance() {
        val subTypes = ServiceLoader.load(CasBanner.class)
            .stream()
            .map(ServiceLoader.Provider::get)
            .toList();
        return subTypes.isEmpty() ? new DefaultCasBanner() : subTypes.getFirst();
    }
Gets cas banner instance.

@return the cas banner instance
core/cas-server-core-util-api/src/main/java/org/apereo/cas/util/spring/boot/CasBanner.java