最近在學習使用spring boot。使用maven創建好工程，只引用需要用到的spring boot相關的jar包,除此之外沒有任何的配置。

寫了一個最簡單的例子，如下所示:

 1 package com.torlight;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 5 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 6 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 7 import org.springframework.context.ApplicationContext;
 8 import org.springframework.context.ConfigurableApplicationContext;
 9 
10 
11 /**
12  * @since 2017.05.06
13  * @author acer
14  *
15  */
16 @SpringBootApplication
 
17 public class Application {
18     
19     public static void main(String[] args) {
20         ApplicationContext appctx= SpringApplication.run(Application.class,args);
21         
22         System.out.println("appctx.getBeanDefinitionCount="+appctx.getBeanDefinitionCount());
23         try {
 
24             ((ConfigurableApplicationContext)appctx).close();
25         } catch (Exception e) { /*ignore*/ }
26     }
27 }

運行程序後，控制臺輸出錯誤日誌：

017-05-06 22:44:18.868 WARN 41648 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : 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 (no profiles are currently active).
2017-05-06 22:44:18.871 INFO 41648 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service Tomcat
2017-05-06 22:44:18.902 INFO 41648 --- [ restartedMain] utoConfigurationReportLoggingInitializer :

Error starting ApplicationContext. To display the auto-configuration report re-run your application with ‘debug‘ enabled.
2017-05-06 22:44:18.907 ERROR 41648 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :

***************************
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 (no profiles are currently active).

這是因為spring boot默認會加載org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration類，[email protected]spring

註入了dataSource bean。因為工程中沒有關於dataSource相關的配置信息，當spring創建dataSource bean因缺少相關的信息就會報錯。

因為我僅僅只是使用spring boot來寫一些很簡單的例子來學習它，[email protected](exclude={DataSourceAutoConfiguration.class})

阻止spring boot自動註入dataSource bean

 1 package com.torlight;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 5 import org.springframework.boot.autoconfigure.SpringBootApplication;
 6 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 7 import org.springframework.context.ApplicationContext;
 8 import org.springframework.context.ConfigurableApplicationContext;
 9 
10 
11 /**
12  * @since 2017.05.06
13  * @author acer
14  *
15  */
16 @SpringBootApplication
17 @EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
18 public class Application {
19     
20     public static void main(String[] args) {
21         ApplicationContext appctx= SpringApplication.run(Application.class,args);
22         
23         System.out.println("appctx.getBeanDefinitionCount="+appctx.getBeanDefinitionCount());
24         try {
25             ((ConfigurableApplicationContext)appctx).close();
26         } catch (Exception e) { /*ignore*/ }
27     }
28 }

spriing boot 啟動報錯：Cannot determine embedded database driver class for database type NONE