在项目工作空间中,在所在项目文件.setting下org.eclipse.wst.common.project.facet.core.prefs.xml
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<fixed facet="jst.web"/>
<fixed facet="wst.jsdt.web"/>
<fixed facet="java"/>
<installed facet="java" version="1.8"/>
<installed facet="jst.web" version="3.1"/>改成 <installed facet="jst.web" version="3.0"/>
<installed facet="wst.jsdt.web" version="1.0"/>
<installed facet="me.spring" version="4.1"/>
</faceted-project>