意思就是project facet java compiler level 不一致

解决办法: 修改project facet

方法一:

选中工程,右键 Property -> Project facet

方法二:

找到项目所在的目录,在.settings子目录里面,用文本编辑器打开org.eclipse.wst.common.project.facet.core.xml配置文件,如图所示:

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