@Override
    public void contribute(final Formatter formatter, final Environment environment) {
        formatter.format("Pac4j Version: %s%n", BaseClient.class.getPackage().getImplementationVersion());
    }
This is {@link Pac4jBannerContributor}.

@author Misagh Moayyed
@since 7.1.0
support/cas-server-support-pac4j-webflow/src/main/java/org/apereo/cas/pac4j/Pac4jBannerContributor.java