My SQLDelete annotaion Code is not working

Question

I want to make Soft delete code at Spring Boot... But, @SQLDelete is not working This code is not working on my server. And I have no idea about that.

Entity

@Entity // DB와의 연결을 위하여
@Data   // getter setter
// @Where(clause = "is_deleted = false")
@SQLDelete(sql = "UPDATE board SET is_deleted = true WHERE id = ?")
public class Board {
    @Id // id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotNull
    private String title;

    @Lob
    @Column(columnDefinition="TEXT", nullable = false)
    private String content;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="user_id", referencedColumnName = "id")
    private User user;

    @ColumnDefault("false")
    private boolean isDeleted;

Service

public void deleteBoard(Long boardId){
    boardRepository.deleteById(boardId);
}

Test

@Test
public void 삭제서비스테스트() throws Exception {
    //given
    User user = new User(1L, "찬", "[email protected]", "picture", Role.GUEST);
    userRepository.save(user);
    for(int i=0; i<100; i++){
        Board board = new Board((long) i, "제목"+i, "내용"+i, user);
        boardRepository.save(board);
    }

    //when
    boardService.deleteBoard(4L);
    boardService.deleteBoard(15L);

    Board board = boardService.findBoard(5L);
    Board board2 = boardService.findBoard(15L);

    //then
    System.out.println("~~~~~~~~~~~~~~~~~~~~~");
    System.out.println(board);
    System.out.println(board2);
    System.out.println("~~~~~~~~~~~~~~~~~~~~~");
}

and result is

~~~~~~~~~~~~~~~~~~~~~
Board(id=5, title=제목5, content=내용5, user=com.board.board.domain.oauth.User@346690d6, isDeleted=false)
null
~~~~~~~~~~~~~~~~~~~~~

I can not understand why it does not work on source.. Can I receive some advice??