Extract principal on server side from outToken/KRB_AP_REQ

Hey,
I have a Kerberos SSO application with JAAS/JGSSAPI according to the tutorial which can be found here: http://java.sun.com/j2se/1.4.2/docs/guide/security/jgss/single-signon.html
Mutual authentication with initSecContext() and acceptSecContext() works fine. Now, on the server side, I would like to extract the principal from the outToken. In Kerberos terms this means the KRB_AP_REQ message which is generated by initSecContext() and send to the server.
Is there any possibility to get the principal's name from this byte array?

Don't you have to use GSSUtil.createSubject on the server side to obtain a Subject, from which the principal name of the client can be obtained?
Alec

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