@PostMapping("/join") 
    public String join(MemberForm memberForm) { 
        System.out.println(memberForm.toString()); 

        Member member = memberForm.toEntity(); 
        System.out.println(member.toString()); 

        Member saved = memberRepository.save(member); 
        System.out.println(saved.toString()); 
        return ""; 
    } 
}