authenticate user on server side for Swing clients using kerberos/spnego

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I am using kerberos protocol to authenticate users for Java Swing applications. I am able to successfully authenticate at the client side, but having problems when getting the user credentials and roles on the server side, I have got ejbs which require certain roles to create those ejbs.

jboss-app.xml looks like

 <jboss-app>
    <security-domain>java:/jaas/spnego-server</security-domain>       
    <loader-repository>paymenttracker:loader=paymenttracker.ear</loader-repository>
 </jboss-app>

The client class calling Subject.doAs(s, lv); lv is a class which extends PrivilegedExceptionAction.

On the server side login-config.xml in jboss server got the following setting

     <application-policy name="spnego-server"><authentication> 
    <login-module code="com.sun.security.auth.module.Krb5LoginModule" flag="required" >
<module-option name="storeKey">true</module-option> 
<module-option name="debug">true</module-option> 
<module-option name="useKeyTab">true</module-option> 
<module-option name="keyTab">file://c:/ker/tem.keytab</module-option> 
<module-option name="principal">HTTP/ws6421.ebrd.com</module-option> 
<module-option name="doNotPrompt">true</module-option> 
<module-option name="isInitiator">false</module-option> 
</login-module></authentication>
</application-policy> 

getting the following error :

16:09:28,990 INFO  [STDOUT] Debug is  true storeKey true useTicketCache false useKeyTab true doNotPrompt true
ticketCache is null isInitiator false KeyTab is file://c:/kerberos/ws6421.keytab refreshKrb5Config is false pr
incipal is HTTP/ws6421.my.com tryFirstPass is false useFirstPass is false storePass is false clearPass is fa
lse
16:09:29,087 INFO  [STDOUT] principal's key obtained from the keytab
16:09:29,087 INFO  [STDOUT] principal is HTTP/[email protected]
16:09:29,088 INFO  [STDOUT] EncryptionKey: keyType=23 keyBytes (hex dump)=0000: A9 DD 6C AB C5 D3 A0 9D   C8 4
4 18 52 78 3E AB 82  ..l......D.Rx>..
16:09:29,094 INFO  [STDOUT] Added server's keyKerberos Principal HTTP/[email protected] Version 0key
 EncryptionKey: keyType=23 keyBytes (hex dump)=
0000: A9 DD 6C AB C5 D3 A0 9D   C8 44 18 52 78 3E AB 82  ..l......D.Rx>..
16:09:29,095 INFO  [STDOUT]             [Krb5LoginModule] added Krb5Principal  HTTP/[email protected] t
o Subject
16:09:29,098 INFO  [STDOUT] Commit Succeeded
16:09:29,135 ERROR [SecurityInterceptor] Error in Security Interceptor
java.lang.SecurityException: Denied: caller with subject=Subject:
        Principal: HTTP/[email protected]
        Private Credential: Kerberos Principal HTTP/[email protected] Version 0key EncryptionKey: ke
yType=23 keyBytes (hex dump)=
0000: A9 DD 6C AB C5 D3 A0 9D   C8 44 18 52 78 3E AB 82  ..l......D.Rx>..


 and security context post-mapping roles=null: ejbMethod=public abstract services.ejb.login.SBLogin services.e
jb.login.SBLoginHome.create() throws javax.ejb.CreateException,java.rmi.RemoteException
        at org.jboss.ejb.plugins.SecurityInterceptor.checkSecurityContext(SecurityInterceptor.java:368)
        at org.jboss.ejb.plugins.SecurityInterceptor.process(SecurityInterceptor.java:243)
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