No problem.
Hopefully the java forum search and google are now your friends. They will certainly yield better results than asking for the code on here.
People are here to 'help', not to send you solutions. It took me a while, trial and error. Use the tutorial, also have a look at http://forum.java.sun.com/thread.jspa?forumID=51&threadID=395518.
I did a search and that was the 3rd one down. Why couldnt you try that first?
Now, when anyone does a search for kerberos they will stumble across this thread, tsk!
I'm no expert but if you have a go (like I did) then maybe I can help solve some more specific questions.
Ted.