The server time zone value 'KST' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
해결 방법은 두가지
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jdbc 접속 url query string에 serverTimezone=Asia/Seoul을 입력하기
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mysql 타임존 설정
[mysqld]