java项目显示红叉，程序却没有错误

电脑换了不同版本的Tomcat和JDK后，导入之前的项目出现红叉错误，程序却没有出现错误：

在eclipse的markers标签页下提示2个错误警告：
错误一：Description Resource PathLocation Type Java compiler level does not match the version of theinstalled Java project facet. ****** Unknown  Faceted Project
Problem (Java VersionMismatch)

本地资源描述文件中配置的jdk版本和我电脑上安装的版本不匹配。

解决方案：找到项目在本地工作空间目录下的 .settings目录。打开org.eclipse.wst.common.project.facet.core.xml

< ?xml version="1.0" encoding="UTF-8"?>
< ?faceted -project>
< ?runtime name="MyEclipse Tomcat v7.0">
< ?fixed facet="wst.jsdt.web">
< ?fixed facet="java">
< ?fixed facet="jst.web">
< ?installed facet="java" version="1.5">
< ?installed facet="jst.web" version="2.5">
< ?installed facet="jst.web.jstl" version="1.2">
< ?installed facet="web.struts2" version="2.1">
< ?installed facet="wst.jsdt.web" version="1.0">
< \/faceted>
< \/code>

将< ?installed facet="java" version="1.5">修改成自己电脑上安装的jdk版本，比如我安装的jdk是jdk1.8.0_91,就修改为1.8

错误二：DescriptionResource
Path Location Type Target runtime MyEclipse Tomcatv7.0
Unknown Faceted ProjectProblem   本地安装的tomcat版本与项目资源配置文件配置的版本不匹配
解决方案：找到项目在本地工作空间目录下的 .settings目录。打开org.eclipse.wst.common.project.facet.core.xml

< ?xml version="1.0" encoding="UTF-8"?>
< ?faceted -project>
< ?runtime name="MyEclipse Tomcat v7.0">
< ?fixed facet="wst.jsdt.web">
< ?fixed facet="java">
< ?fixed facet="jst.web">
< ?installed facet="java" version="1.5">
< ?installed facet="jst.web" version="2.5">
< ?installed facet="jst.web.jstl" version="1.2">
< ?installed facet="web.struts2" version="2.1">
< ?installed facet="wst.jsdt.web" version="1.0">
< \/faceted>
< \/code>

将< ?runtime name="MyEclipse Tomcat v7.0">删除，保存后在eclipse中右键项目refresh.