java compile level does not match the version of installed java project facet

java compile level does not match the version of installed java project facet
意思:java编译级别与安装的java项目facet的版本不匹配

项目jdk版本和Project Facets的java版本不匹配,项目会报红叉,但不影响运行。
解决:右键项目,Properties 选中Project Facets 选中 java一栏 jdk版本改成和该项目一直。Apply保存

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