project/.settings/org.eclipse.wst.common.project.facet.core.xml
<?xml version="1.0" encoding="UTF-8"?> <faceted-project> <fixed facet="wst.jsdt.web"/> <installed facet="jst.web" version="2.5"/> 改成2.5 <installed facet="wst.jsdt.web" version="1.0"/> <installed facet="java" version="1.7"/> 改成1.7 </faceted-project>