springboot启动错误：Cannot determine embedded database driver class for database type NONE

项目场景：

springboot 已经配置数据源，但是 启动错误

---

问题描述

***************************
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).



Caused by: 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).

---

原因分析(前提：项目已经配置数据源 )：

一开始去网上查找原因分析，有以下几种情况：

第一种：

resources文件有问题,比如后缀写错了，结构不对等，经查问题不在于此

第二种：

resources文件没问题,但是没有配置数据源，经查问题不在于此

---

解决方案：

逐一排查项目pom文件依赖

<!-- <dependency>
			<groupId>org.junit.vintage</groupId>
			<artifactId>junit-vintage-engine</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.hamcrest</groupId>
					<artifactId>hamcrest-core</artifactId>
				</exclusion>
			</exclusions>
		</dependency> -->

找到出现问题的依赖，直接注释掉依赖，重启工程成功。

解决问题思路：
因为项目已经配置数据源，所以数据源这块保证没问题，那么问题肯定出现在加载引用数据源的地方，而springboot启动就会自动管理依赖及版本了，这时候出现问题就跟依赖有关系了。