springboot项目启动报错Error starting ApplicationContext.

启动springboot程序报错

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-05-20 11:00:42.144 ERROR 3960 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be 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).


Process finished with exit code 1

1. 首先检查项目配置文件中是否存在程序不可识别的代码、或者手误多出来了字符（如果是刚创建启动报错这个可以跳过）
2. 检查自己的pom文件中是否存在包重复导入的问题
   
3. 检查自己的controller中的注解是否错误
   是否存在"/"多或者少代码错误等问题

@GetMapping("/test")
    public String test(){
     
        return "ok";
    }

4. 如果项目创建时导入了jdbc、mysql的包直接启动项目就会提示（当前没有配置文件处于活动状态）。即没有配置相关的启动
   如图添加了这两个依赖启动就会出现以上错误

<dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-jdbcartifactId>
        dependency>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>
    dependencies>