eclipse提示java compiler level does not match the version of the installed java

    eclipse提示「Java compiler level does not match the version of the installed java project facet」的解決辦法：     在項目的根目錄下有個.settings文件夾，用文本編輯軟件打開.settings文件夾下的org.eclipse.wst.common.project.facet.core.xml文

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