1. 에러

Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution

2. 해결

• hibernate:
  ddel-auto: update 주석
  jpa: hibernate.hbm2ddl.auto: update로 변경해 해결

3. 출처

https://velog.io/@ssonzm/SPRING-%EC%97%90%EB%9F%AC-%ED%95%B4%EA%B2%B0