由于之前重新安装了java，11卸载安装了1.8，所有之前做的所有java使用11的项目都出现了这个问题
1.更改java版本，换成你当前的java版本
2.更改project facets，换成你当前的java版本
大功告成
相关文章
- Java compiler level does not match the version of the installed Java project facet.解决办法
- eclipse Java compiler level does not match the version of the installed Java project facet.
- Tomcat Add and Remove 项目时提示 Project facet Java version 1.8 is not supported 错误
- 项目移植过程中报：“Project facet Java version 1.7 is not supported.” 错误
- Eclipse移植项目时JDK版本不匹配Project facet Java version 1.7 is not supported
- Eclipse打war包方法以及Eclipse移植项目时JDK版本不匹配Project facet Java version 1.7 is not supported
- Eclipse Tomcat ： Project facet Java version 1.7 is not supported.
- 解决java compiler level does not match the version of the installed java project facet【转载】
- [常见问题]Project facet Java versin 1.8 is not support.
- 解决java compiler level does not match the version of the installed java project facet问题