问题描述：

springboot启动时遇到错误：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-10-09 16:10:19.148 ERROR 3668 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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APPLICATION FAILED TO START
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Description:

Failed to bind properties under '' to com.zaxxer.hikari.HikariDataSource:

    Property: driver-class-name
    Value: com.mysql.cj.jdbc.Driver
    Origin: "driverClassName" from property source "source"
    Reason: java.lang.RuntimeException: Failed to load driver class com.mysql.cj.jdbc.Driver in either of HikariConfig class loader or Thread context classloader

Action:

Update your application's configuration

原因分析：

springBoot作测试的时候默认的是h2数据库 而我用的是mysql所以需要在 application.properties中指定一下

解决方案：

在 application.properties中指定一下

spring.datasource.driver-class-name=com.mysql.jdbc.Driver