nested exception is java.lang.IllegalArgumentException: jdbcUrl is required with driverClassName.]

请把配置文件中：

url:jdbc:mysql.....中的url 改为：

jdbc-url: jdbc:mysql....

spring.datasource.jdbc-url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver