[keycloak-user] Is there a good JWK authorisation grant example?

Hi all, Could someone please point me in the direction of some sample code, preferably Java, that illustrates a client generated JWT being used as a or to generate an access token from Keycloak. This page http://blog.keycloak.org/2015/10/authentication-of-clients-with-signed.html seemed to be a good start. But the link to documentation was dead. So far I have been unable to Google a good code example. Thank you. Regards, Michael Chester