解決spring-boot啓動中碰到的問題：Cannot determine embedded database driver class for database type NONE

問題 以下：

2017-07-16 08:50:57.436  INFO 13524 --- [           main] c.p.p.web.PointshopWebApplication        : Starting PointshopWebApplication on MSI with PID 13524 (D:\javaProject\com.ppdai.pointshop\pointshop-web\target\classes started by yangliweng in D:\javaProject\com.ppdai.pointshop)

2017-07-16 08:50:57.436  INFO 13524 --- [           main] c.p.p.web.PointshopWebApplication        : No active profile set, falling back to default profiles: default

2017-07-16 08:50:57.478  INFO 13524 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@179bb86: startup date [Sun Jul 16 08:50:57 GMT+08:00 2017]; root of context hierarchy

2017-07-16 08:50:57.798  WARN 13524 --- [           main] o.m.s.mapper.ClassPathMapperScanner      : No MyBatis mapper was found in '[com.ppdai.pointshop.web.controller, com.ppdai.pointshop.web]' package. Please check your configuration.

2017-07-16 08:50:57.829  INFO 13524 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!

2017-07-16 08:50:58.001  WARN 13524 --- [           main] o.h.v.m.ParameterMessageInterpolator     : HV000184: ParameterMessageInterpolator has been chosen, EL interpolation will not be supported

2017-07-16 08:50:58.151  WARN 13524 --- [           main] o.h.v.m.ParameterMessageInterpolator     : HV000184: ParameterMessageInterpolator has been chosen, EL interpolation will not be supported

2017-07-16 08:50:58.224  WARN 13524 --- [           main] s.c.a.AnnotationConfigApplicationContext : 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).

2017-07-16 08:50:58.240  INFO 13524 --- [           main] utoConfigurationReportLoggingInitializer : 

 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.

2017-07-16 08:50:58.240 ERROR 13524 --- [           main] 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).

 

 

Process finished with exit code 1

 

------------------------我是分割線------------------

網上 找到了所謂的解決 方法：

@SpringBootApplication(exclude = {

		DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class
},scanBasePackages = {"com.ppdai.pointshop.web.controller"}
)
public class PointshopWebApplication {

	public static void main(String[] args) {
		SpringApplication.run(PointshopWebApplication.class, args);
	}
}

　　可是很 遺憾 ，沒用。

因而 用maven下載 好springboot 的源碼，而後斷點調試 進去 ，看看 是什麼狀況，最後 發現了問題的所在：

由於我這是一個新 項目 ，還 沒有 配置數據源 ，可是我又想在 沒配置數據源的狀況 下去 啓動項目，該怎麼辦呢 ？網上找到的方法是無效的，因而我作了一個大膽的猜想：確定是某個地方加載了這個bean,由於 這是 一個新項目，因此 我以爲 啓動加載的可能性很大，而啓動 加載 只有 POM文件 裏面的依賴才 有可能辦到。下面 是 個人dependency依賴：

	<dependencies>
		<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-autoconfigure -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-autoconfigure</artifactId>
			<version>1.5.4.RELEASE</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot</artifactId>
			<version>1.5.4.RELEASE</version>
		</dependency>


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-aop</artifactId>
			<version>1.5.4.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
			<version>1.5.4.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.0</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<version>1.5.4.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<version>1.5.4.RELEASE</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<version>1.5.4.RELEASE</version>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>4.3.9.RELEASE</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>4.3.9.RELEASE</version>
		</dependency>


	</dependencies>

　　一個個排查，最後查到org.mybatis.spring.boot這個依賴 ，註釋掉便可,能夠發現，調試的時候 beannames明顯少了不少。

<dependency>
   <groupId>org.mybatis.spring.boot</groupId>
   <artifactId>mybatis-spring-boot-starter</artifactId>
   <version>1.3.0</version>
</dependency>

最終，Spring Boot 啓動成功！