Performs the authentication attempt by interacting with the single configured realm, which is significantly
simpler than performing multi-realm logic.
@param realm the realm to consult for AuthenticationInfo.
@param token the submitted AuthenticationToken representing the subject's (user's) log-in principals and credentials.
@return the AuthenticationInfo associated with the user account corresponding to the specified {@code token}
Performs the authentication attempt by interacting with the single configured realm, which is significantly simpler than performing multi-realm logic.
@param realm the realm to consult for AuthenticationInfo. @param token the submitted AuthenticationToken representing the subject's (user's) log-in principals and credentials. @return the AuthenticationInfo associated with the user account corresponding to the specified {@code token}