public void initialize(Subject subject,CallbackHandler callbackHandler,Map<String,?> sharedState,Map<String,?> options){
  unauthenticatedIdentity=(String)options.get("unauthenticatedIdentity");
  handler=callbackHandler;
  this.subject=subject;
}

public void initialize ( Subject subject , CallbackHandler callbackHandler , Map < String , ? > sharedState , Map < String , ? > options ) { unauthenticatedIdentity = ( String ) options . get ( "unauthenticatedIdentity" ) ; handler = callbackHandler ; this . subject = subject ; }
initialize the login module , get options from configuration
