解决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.的解决:eclipse 1.在资源管理器下,找到项目所在的目录在E:\dormitory\dorm\.settings子目录中,用文本编辑器打开org.eclipse.wst.common.project.facet.core.xml
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