In KerberosAuthExample , after an user authentication, a ticket is retrieved.
Using this ticket, a SMB folder is accessed and the files listed.
When using Java 6, this example works perfectly.
However, when using Java 7, I always receives
jcifs.smb.SmbAuthException: Access is denied."

refer to bugdb for reproducer.

jcifs.smb.SmbAuthException: Access is denied.
at jcifs.smb.SmbTransport.checkStatus(SmbTransport.java:596)
at jcifs.smb.SmbTransport.send(SmbTransport.java:722)
at jcifs.smb.Kerb5Authenticator.setup(Kerb5Authenticator.java:214)
at jcifs.smb.Kerb5Authenticator.access$000(Kerb5Authenticator.java:30)
at jcifs.smb.Kerb5Authenticator$1.run(Kerb5Authenticator.java:168)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at jcifs.smb.Kerb5Authenticator.sessionSetup(Kerb5Authenticator.java:166 )
at jcifs.smb.SmbSession.sessionSetup(SmbSession.java:320)
at jcifs.smb.SmbSession.send(SmbSession.java:239)
at jcifs.smb.SmbTree.treeConnect(SmbTree.java:176)
at jcifs.smb.SmbFile.doConnect(SmbFile.java:925)
 at jcifs.smb.SmbFile.connect(SmbFile.java:974)
at jcifs.smb.SmbFile.connect0(SmbFile.java:890)
at jcifs.smb.SmbFile.getType(SmbFile.java:1302)
at jcifs.smb.SmbFile.doEnum(SmbFile.java:1753)
at jcifs.smb.SmbFile.listFiles(SmbFile.java:1735)
at jcifs.smb.SmbFile.listFiles(SmbFile.java:1668)
at KerberosAuthExample.main(KerberosAuthExample.java:42)

As a workaround, KerberosAuthExample works on JDK7 if SMB signing is disabled on the Windows Server (http://support.exinda.com/topic/how-to-disable-smb-signing-on-windows-servers -to-improve-smb-performance).

Also I found replacing the following classes in JDK 1.7 with the ones from JDK 1.6 make KerberosAuthExample succeed.
com\sun\security\auth\module\Krb5LoginModule.class
sun\security\krb5\Credentials$1.class
sun\security\krb5\Credentials.class
 sun\security\krb5\EncryptedData.class
sun\security\krb5\EncryptionKey.class
sun\security\krb5\KrbAsrep.class
sun\security\krb5\KrbAsReq.class
sun\security\krb5\KrbKdcReq$1.class
sun\security\krb5\KrbKdcReq$BpType.class
sun\security\krb5\KrbKdcReq$KdcAccessibility.class
sun\security\krb5\KrbKdcReq$KdcCommunication.class
sun\security\krb5\KrbKdcReq.class
sun\security\krb5\KrbTgsRep.class
sun\security\krb5\internal\KerberosTime.class
sun\security\krb5\internal\KRBError.class