1.
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
在配置文件中添加：
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
2.
Caused by: java.sql.SQLException: No timezone mapping entry for 'GMT+'
修改数据库URL的参数值： serverTimezone=GMT%2B --> serverTimezone=UTC
jdbc:mysql://localhost:3306/shopping?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
来源：
1. https://blog.csdn.net/BeauXie/article/details/75948457
2. https://stackoverflow.com/questions/26515700/mysql-jdbc-driver-5-1-33-time-zone-issue