Java Security

Hi,
I am trying to run the GSSClient/GSSServer example in the JAAS/JGSS tutorial.

In the tutorial it says "So for the purposes of trying out this tutorial, you could use your user name as both the client user name and the service principal name. "

As I dont have permissions to make modifications to Active Directory, I thought I could use this to get away from having to create a SPN. So I am using my username for both the client user and the SPN.

When the GSSClient tries to establish a context with the server, it fails because it cant find the server in the kerberos database. But I am using my user name ffor server principal and simple JAAS authentication succeeds with my username so why cant GSSClient find it
when trying to establish a context ?

Any clues would be greatly appreciated.

Thanks !

Here is the stack trace ..

KrbException: Identifier doesn't match expected value (906)
at sun.security.krb5.internal.af.a(DashoA6275:134)
at sun.security.krb5.internal.ae.a(DashoA6275:63)
at sun.security.krb5.internal.ae.<init>(DashoA6275:58)
at sun.security.krb5.KrbTgsRep.<init>(DashoA6275:49)
at sun.security.krb5.KrbTgsReq.getReply(DashoA6275:222)
at sun.security.krb5.internal.az.a(DashoA6275:299)
at sun.security.krb5.internal.az.a(DashoA6275:111)
at sun.security.krb5.Credentials.acquireServiceCreds(DashoA6275:495)
at sun.security.jgss.krb5.Krb5Context.initSecContext(Krb5Context.java:580)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:213)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:158)
at GssClient$GssClientAction.run(GssClient.java:170)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:379)
at Jaas.loginAndAction(Jaas.java:94)
at GssClient.main(GssClient.java:97)
KrbException: Server not found in Kerberos database (7)
at sun.security.krb5.KrbTgsRep.<init>(DashoA6275:64)
at sun.security.krb5.KrbTgsReq.getReply(DashoA6275:222)
at sun.security.krb5.internal.az.a(DashoA6275:299)
at sun.security.krb5.internal.az.a(DashoA6275:111)
at sun.security.krb5.Credentials.acquireServiceCreds(DashoA6275:495)
at sun.security.jgss.krb5.Krb5Context.initSecContext(Krb5Context.java:580)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:213)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:158)
at GssClient$GssClientAction.run(GssClient.java:170)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:379)
at Jaas.loginAndAction(Jaas.java:94)
at GssClient.main(GssClient.java:97)
Caused by: KrbException: Identifier doesn't match expected value (906)
at sun.security.krb5.internal.af.a(DashoA6275:134)
at sun.security.krb5.internal.ae.a(DashoA6275:63)
at sun.security.krb5.internal.ae.<init>(DashoA6275:58)
at sun.security.krb5.KrbTgsRep.<init>(DashoA6275:49)
... 12 more
java.security.PrivilegedActionException: GSSException: No valid credentials provided (Mechanism level: Server not found in Kerberos database (7))
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:379)
at Jaas.loginAndAction(Jaas.java:94)
at GssClient.main(GssClient.java:97)
Caused by: GSSException: No valid credentials provided (Mechanism level: Server not found in Kerberos database (7))
at sun.security.jgss.krb5.Krb5Context.initSecContext(Krb5Context.java:665)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:213)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:158)
at GssClient$GssClientAction.run(GssClient.java:170)
... 4 more