Multiple annotations found at this line: - The superclass "javax.servlet.http.HttpServlet" was not

jsp頁面出現錯誤：

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

解決方案：

1.右鍵項目 build path

2.選擇 configure build path

3.切換至 libraries 選項卡

4.點擊 add external jars

5.找到tomcat安裝路徑（我的是C:\Program Files\Apache Software Foundation\Tomcat 9.0\）lib文件夾下

的servlet-api.jar，添加

6.確定 -> 完成

 原文：https://blog.csdn.net/qq_26954773/article/details/53561092