SpringBoot启动报错Failed-to-determine-a-suitable-driver-class

SpringBoot 启动报错如下

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-05-06 21:27:18.275 ERROR 10968 --- [main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
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Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).


Process finished with exit code 1

把这个依赖注释掉就好了

原因

应用没有使用到 DataSource，但是在 pom.xml 里引入了 mybatis-spring-boot-starter

问题解决办法
有两种：
把 mybatis-spring-boot-starter 的依赖去掉，这样就不会触发 spring boot 相关的代码
把 spring boot 自动初始化 DataSource 相关的代码禁止掉

禁止的办法有两种：

在启动类的 @SpringBootApplication 加上

    @SpringBootApplication(exclude = { DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class})

在 application.properties 里配置：

    spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration

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