LazyInitializationException: failed to lazily initialize a collection of role: web.entity.Users.boardList, could not initialize proxy - no Session

code in controller:

result = boardService.getBoardListByUser(user);
         List<Boards> boardList = new ArrayList<Boards>((List)result.getObject());
         model.put("boards",boardList);




code in service:

@Transactional(readOnly = false)
    public ResultImpl getBoardListByUser(Users user){
        List<Boards> boardList = new ArrayList<Boards>(user.getBoardList());
        if(!boardList.isEmpty()){
            result.setIsSuccessful(true);
            result.setObject(boardList);
        }else{
            result.setIsSuccessful(false);
        }
        return result;
    }