1.Project facet Java version 1.8 is not supported解决记录
修改了.setting文件 ，把原来的1.8改为了1.7
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<fixed facet="jst.java"/>
<fixed facet="jst.web"/>
<installed facet="jst.web" version="2.4"/>
<installed facet="jst.java" version="1.7"/>
</faceted-project>
2.其他修改了eclipse的jdk跟jre