今天新搭建了一個springboot+gradle框架，然而，剛搭建好運行的時候，就報了一個錯誤：
Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2018-11-19 13:59:44.020 ERROR 1256 — [ main] o.s.b.d.LoggingFailureAnalysisReporter :
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 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).
問過度娘娘後，才知道，需要在啓動類的@EnableAutoConfiguration或@SpringBootApplication中添加exclude= {DataSourceAutoConfiguration.class}，排除此類的autoconfig。啓動以後就可以正常運行。
這是因爲添加了數據庫組件，所以autoconfig會去讀取數據源配置，而我新建的項目還沒有配置數據源，所以會導致異常出現。
照着改過之後，再次運行，就可以了，親測。。。