Eclipse: Error message the superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build Path

Javaweb: Error message the superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build Path

A Javaweb project was established today, and Web container tomcat was configured in Eclipse. The "Red" error message appears at the top of the JSP page: the superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build Path. The reason is that the Tomcat runtime related classes are not being added to the Javaweb engineering class.

Here are the specific workarounds:

1. Right-click Web Project--Properties or build Path-->java build Path-->libraries-->add libray-->server Runtime-->tomcat Server

2. Switch to Orader and Export in the Java Build path interface and select Tomcat.

Attention:

When you do this, you need to set up an Apache server if you open the Server runtime blank. Set the method to: Window->preferences->server->runtime environment, add-on, select the Apache version and click Next. Then fill in the installation (unpacked) address of your Apache server software.

Eclipse: Error message the superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build Path