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

创建一个jsp文件后发现报错↓
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

解决方法：
Windows→Preferences→Server→Add…





如果上图没出来，就：Windows→Show View→Servers