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

第一次搭建springboot 写HelloWorld报错

2019-06-11 13:56:23.485 INFO 13816 — [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService ‘applicationTaskExecutor’
2019-06-11 13:56:23.487 INFO 13816 — [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-06-11 13:56:23.497 INFO 13816 — [ main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2019-06-11 13:56:23.501 ERROR 13816 — [ 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).

Process finished with exit code 1

加上@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)这个就行了
原因就是没有配置数据源

正式项目中这个问题待总结