public interface WLSUser extends Principal
WLSUser interface is a marker interface used to signify that a principal
 represents a WebLogic Server user. Therefore, any principal that is going to represent a
 WebLogic Server user should implement this interface.
 
 If you want to get the name of a subject or the WLSUser within it,
 the SubjectUtils class has helper methods that may be useful.
SubjectUtils