There should be a link to the Kerberos 5 GSS-API Mechanism doc (http://docs.oracle.com/javase/8/docs/technotes/guides/security/jgss/jgss-api-mechanism.html) from the SE Security Contents page (http://docs.oracle.com/javase/8/docs/technotes/guides/security/index.html) in the Java Generic Security Services (Java GSS-API) section.