400 에러 :: There was an unexpected error (type=Bad Request, status=400)

There was an unexpected error (type=Bad Request, status=400).

Required request parameter 'loginId' for method parameter type String is not present

org.springframework.web.bind.MissingServletRequestParameterException: Required request parameter 'loginId' for method parameter type String is not present

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원인:

- JSP의 AJAX에서 data를 받지 못함

- formData를 쓰려면 input의 name으로 데이터를 받아야 하는데 id로 받음