public boolean isValid(){
  return System.currentTimeMillis() < creationTime + lifetime + (lifetime / 4);
}

public boolean isValid ( ) { return System . currentTimeMillis ( ) < creationTime + lifetime + ( lifetime / 4 ) ; }
return security token validity . security token is still valid if it has expired up to 25 % after its lifetime . ( see part 6 , 5 . 5 . 2 . 1 / 3 )
