才写了一行代码又报错了..
***************************APPLICATION FAILED TO START***************************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 classAction: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).Disconnected from the target VM, address: ‘127.0.0.1:58792‘, transport: ‘socket‘Process finished with exit code 0未指定“url”属性，无法配置嵌入的数据源。
原因：由于添加了数据库组件，所以autoconfig会去读取数据源配置，新建的项目还没有配置数据源，所以会导致异常出现。
解决办法：
在启动类添加如下内容
即：@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
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转自：悟世君子的博客
Failed to configure a DataSource 'url' attribute问题解决
原文地址：https://www.cnblogs.com/zilongmao/p/10351315.html