修改编译jdk版本为1.8

.settings/org.eclipse.wst.common.project.facet.core.xml

@@ -2,8 +2,8 @@
 <faceted-project>
   <fixed facet="wst.jsdt.web"/>
   <installed facet="wst.jsdt.web" version="1.0"/>
-  <installed facet="java" version="1.7"/>
   <installed facet="jst.web" version="3.0"/>
   <installed facet="jst.jaxrs" version="1.1"/>
   <installed facet="maven" version="1.0"/>
+  <installed facet="java" version="1.8"/>
 </faceted-project>