今天準備把我之前搭建的，基於springboot的框架的基礎功能包抽離出來，在增加spring yml自定義設定後，在業務專案啟動時會報出以下異常。

2017-02-23 18:55:09.869 WARN main  org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext[refresh:550] - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource'
 
 defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource'
 
 threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (the profiles "dev,redis,config,mongodb,activemq,socketio"
 
 are currently active).
2017-02-23 18:55:14.322 INFO main  com.corundumstudio.socketio.SocketIOServer[stop:198] - SocketIO server stopped
2017-02-23 18:55:14.349 INFO main  org.springframework.boot.autoconfigure.logging.AutoConfigurationReportLoggingInitializer[logAutoConfigurationReport:101] - 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-02-23 18:55:14.355 ERROR main  org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter[report:42] - 

***************************
APPLICATION FAILED TO START
***************************

Description:

Cannot determine embedded database driver class for database type NONE

Action:

If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (the profiles "dev,redis,config,mongodb,activemq,socketio" are currently active).

在多方查證後，需要在啟動類的@EnableAutoConfiguration或@SpringBootApplication中新增exclude = {DataSourceAutoConfiguration.class}，排除此類的autoconfig。啟動以後就可以正常執行。
後期在繼續抽取spring boot底層功能封裝時，會從原始碼找到此問題發生的原因，並更新此文章