连接数据库异常

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).

启动main函数时报以上错误，

1、查看yml文件配置，发现确实有配置数据库连接。

datasource:
  driver-class-name: com.mysql.cj.jdbc.Driver
  url: jdbc:mysql://127.0.0.1/admin?useSSL=false&useUnicode=true&characterEncoding=UTF8&serverTimezone=Asia/Shanghai
  username: root
  password: 123456
  type: com.alibaba.druid.pool.DruidDataSource

 2、检查代码，并未发现任何错误。

3、检查编译后的target文件，发现yml文件没有被编译。

4、检查pom文件，发现打包模式为pom，如下：

service-admin
pom
平台运营后台微服务

解决方案：删除pom这一行。