解決Java compiler level does not match the version of the installed Java project facet.

Java compiler level does not match the version of the installed Java project facet.的解決：eclipse 1.在資源管理器下，找到項目所在的目錄在E:\dormitory\dorm\.settings子目錄中，用文本編輯器打開org.eclipse.wst.common.project.facet.core.xml

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