先说解决办法
配置属性：
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
解释原因：
新创建的项目没有配置数据源 所以在项目启动的时候回去查找项目的数据源，但是发现找不到所以报错。
如果配置了数据源之后 就算是没有排除自动配置数据源
项目也是可以启动成功的
springboot创建项目后运行报错【Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.】
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