Failed to configure a DataSource: ‘url‘ attribute is not specified and no embedded datasource could

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).

这是因为工程没有配置数据库。

解决方法：

配置H2数据库或者MySQL数据库，其中配置MySQL解决方法如下：

1、添加 MySQL连接驱动的依赖

Maven工程在pom.xml中添加

<dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

gradle工程在build.gradle中添加

implementation 'mysql:mysql-connector-java'

2、在application.properties中添加MySQL数据库配置

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver 
spring.datasource.url=jdbc:mysql://localhost:3306/blog?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=用户名
spring.datasource.password=密码

也可能是你在pom中使用了连接池，但是你没有进行数据库配置