html, jsp쪽 둘다 선언 안됐을 때 알아놓기

@RequestMapping(value="/jpa/board", method=RequestMethod.GET)
public ModelAndView openBoardList() throws Exception {
    ModelAndView mv = new ModelAndView("thymeleaf/board/jpaBoardList");

    List<Board> list = jpaBoardService.selectBoardList();
    mv.addObject("list", list);

    return mv;
}

th:each="list : ${list}">
    <td th:text="${list.boardIdx}"></td>

thymeleaf안에 있는 jpaBoardList.html 들어가보면 이렇게 선언 잘 되어있다고 나옴.