controller/MemberController.java

(생략)

@Slf4j

@Controller
public class MemberController {
    @Autowired
    MemberRepository memberRepository;

    @GetMapping("/signup")
    public String signUpPage() {
        return "members/new";
    }

    @PostMapping("/join")
    public String join(MemberForm memberForm) {

        log.info(memberForm.toString());

        Member member = memberForm.toEntity();

        log.info(member.toString());

        Member saved = memberRepository.save(member);

        log.info(saved.toString());

        return "";
    }
}

dto/MemberForm.java

(생략)

@AllArgsConstructor
@ToString

public class MemberForm {
    private String email;
    private String password;

    // MemberForm 생성자와 toString() 메서드 삭제

    public Member toEntity() {
        return new Member(null, email, password);
    }
}