Use this method to convert a GSSName and GSSCredential into a
Subject. Typically this would be done by a server that wants to
impersonate a client thread at the Java level by setting a client
Subject in the current access control context. If the server is merely
interested in using a principal based policy in its local JVM, then
it only needs to provide the GSSName of the client.
The elements from the GSSName are placed in the principals set of this
Subject and those from the GSSCredential are placed in the private
credentials set of the Subject. Any Kerberos specific elements that
are added to the subject will be instances of the standard Kerberos
implementation classes defined in javax.security.auth.kerberos.
principals - a GSSName containing one or more mechanism specific
representations of the same entity. These mechanism specific
representations will be populated in the returned Subject's principal
credentials - a GSSCredential containing one or more mechanism
specific credentials for the same entity. These mechanism specific
credentials will be populated in the returned Subject's private
credential set. Passing in a value of null will imply that the private
credential set should be left empty.
a Subject with the entries that contain elements from the
given GSSName and GSSCredential.