问题：

每次拉取其它分支，上图中红框中文件就会消失，启动项目，报错：

A problem occurred configuring root project 'project_name'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Using insecure protocols with repositories, without explicit opt-in, is unsupported. Switch Maven repository 'maven(http://nexus.private.com/repository/maven-public/)' to redirect to a secure protocol (like HTTPS) or allow insecure protocols. See https://docs.gradle.org/7.1/dsl/org.gradle.api.artifacts.repositories.UrlArtifactRepository.html#org.gradle.api.artifacts.repositories.UrlArtifactRepository:allowInsecureProtocol for more details. 

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

原因：

idea中 gradle配置错误或gradle使用的默认配置

解决方案：

图中：

1：jar包目录  

2：gradle安装目录

本bug到此为止，下个见.....