Adapters are no longer included with the appliance or war distribution. Each adapter is a separate download on the Keycloak download site. They are also available as a maven artifact.

You must unzip the adapter distro into Tomcat’s lib/ directory. Including adapter’s jars within your WEB-INF/lib directory will not work! The Keycloak SAML adapter is implemented as a Valve and valve code must reside in Tomcat’s main lib/ directory.