EclipseWeb代码开头报错

报错位置：

开头的<%@

错误内容：

Multiple annotations found at this line:
    - The superclass "javax.servlet.http.HttpServlet" was not found on the Java 
     Build Path
    - The superclass "javax.servlet.http.HttpServlet" was not found on the Java 
     Build Path
    - The superclass "javax.servlet.http.HttpServlet" was not found on the Java 
     Build Path

解决方式：

右击项目——BuildPath——Configure build path...——Add Library——Server runtime——Apache Tomcat v9.0