错误展示：
Information:java: Errors occurred while compiling module 'employee-managemen'
Information:javac 1.8.0_144 was used to compile java sources
Information:2020/9/1 12:03 - Build completed with 1 error and 0 warnings in 2 s 5 ms
Error:java: 无效的目标发行版: 11
解决方法：
一、先看编译环境的JDk版本是否一致
1.先看Idea的菜单 File-Settings-Build,Execution,Deployment-Compliler-Java Complier的jdk版本是1.8
2.再看下菜单File-Project Structure下的Project和modules的编译环境是jdk1.8
二、查看编码方式是否为utf-8
重新启动项目，项目错误消失
总结
