[Spring Boot] Loading class 'com.mysql.jdbc.Driver'. This is deprecated. The new driver class is 'com.mysql.cj.jdbc.Driver'.

log4jdbc.log4j2.properties 파일을 열어 다음 두 줄을 추가한다.

log4jdbc.drivers=com.mysql.cj.jdbc.Driver
log4jdbc.auto.load.popular.drivers=false

참고 https://verycrazy.tistory.com/22