启动一个微服务的时候报如下错：
 

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APPLICATION FAILED TO START
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Description:

Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-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

原因是我修改了实体类配置，然后没有配置数据源，所以启动的时候初始化数据源失败了，导致启动失败。

经过查阅资料，解决方法是在启动类加上exclude = {DataSourceAutoConfiguration.class}