springboot项目启动报错 url' attribute is not specified and no embedded datasource could be configured

报错相关信息：

2019-07-22 17:12:48.971 ERROR 8312 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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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).

　　原因：maven父子聚合工程，pom父项目中如果添加了数据库驱动依赖的话，boot项目的autoconfig回去读取加载DataSource相关的配置，读取不到即报错。在一些新项目初始或者不需要db的项目（比如eureka）中，可配置boot的启动类：

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})

　　排除DataSource的自动扫描装配。