打开spring项目后.jsp文件出现红色叉叉（ java新工程导入eclipse常见问题---Multiple annotations found at this line）

1…jsp文件出现红色叉叉
如图

即

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

2.报错信息
Multiple annotations found at this line:

• The method getContextPath() from the type HttpServletRequest refers to the
  missing type String
• The method getContextPath() from the type HttpServletRequest refers to the
  missing type String

3.出错原因原作者版本与你电脑上jdk版本不一致

4.解决方法
4.1对于eclipse
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,选择添加的版本，之后一路ok即可
4.2对于STS（Spring Tool Suite）
①右键工程->properties->之后步骤和4.1一样了。