Failed to configure a DataSource 'url' attribute问题解决

才写了一行代码又报错了..

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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).

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