private long loadLargestMessageId(){
  ReleaseMessage releaseMessage=releaseMessageRepository.findTopByOrderByIdDesc();
  return releaseMessage == null ? 0 : releaseMessage.getId();
}

private long loadLargestMessageId ( ) { ReleaseMessage releaseMessage = releaseMessageRepository . findTopByOrderByIdDesc ( ) ; return releaseMessage == null ? 0 : releaseMessage . getId ( ) ; }
find largest message id as the current start point
