springboot 2.0 啓動報錯 Failed to auto-configure a DataSource
原因
在pom中添加了mybatis，mysql依賴後，如果application.properties中沒有配置數據庫連接方面的配置，則會報錯：
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。
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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).
解決方法
1.在啓動類中加註解
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。