title: Validate a kerberos token with a keytab
body: <p>I'm using Java on the server side and I want to validate a kerberos ticket with java code.  I have a keytab file.  How do I do this?  I keep finding all of these samples which don't use a keytab but I believe I need to use this.  Also, I don't want to use spring or anything like that, just the GSSAPI.  I have a krb5.ini file as well.  Has anyone else done this?</p>