导入项目后出现Multiple annotations found at this line 的问题（jdk不一致）

报错信息是：Multiple annotations found at this line:

- java.io.IOException cannot be resolved to a type

- String cannot be resolved to a type

- java.io.IOException cannot be resolved to a type

- String cannot be resolved to a type

- The type java.util.Map cannot be resolved. It is indirectly referenced from

required .class files

- The method getScheme() from the type ServletRequest refers to the missing type

String

- The type java.util.Map cannot be resolved. It is indirectly referenced from

required .class files

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解决方案：

①.右键工程->Build Path -> Configure Build Path ， 在 Libraries 选项下，会发现有个出错的jre Libraries，将其Remove掉。

②.然后右击该项目 - Build Path - Add Library， 选择JRE System Library,选择现在你使用的要添加的版本，之后一路ok即可。

在problems那里，若显示问题是 Target runtime Apache Tomcat v7.0 is not defined.

则表示运行时没有找到tomcat v7.0

Eclipse

右键--》properties--》targeted runtime,把原项目的tomcat去掉勾选,换上自己的Tomcat

myEclipse

在工程目录下的.settings文件夹里，打开org.eclipse.wst.common.project.facet.core.xml文件，其内容是：

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
    <runtime name="Tomcat v7.0"/>
  <fixed facet="java"/>
  <fixed facet="jst.web"/>
  <fixed facet="wst.jsdt.web"/>
  <installed facet="java" version="1.6"/>
  <installed facet="jst.web" version="3.0"/>
  <installed facet="wst.jsdt.web" version="1.0"/>
</faceted-project>

删除第一句话后是

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>

  <fixed facet="java"/>
  <fixed facet="jst.web"/>
  <fixed facet="wst.jsdt.web"/>
  <installed facet="java" version="1.6"/>
  <installed facet="jst.web" version="3.0"/>
  <installed facet="wst.jsdt.web" version="1.0"/>
</faceted-project>

保存，刷新!