Configure the external Tomcat in Eclipse and build the Tomcat library after the new project

After the new installation of Eclipse, a Web project and a new JSP file are created, an error occurs

The superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build Path

The problem is because the Tomcat-related class library is missing from the project

Because this is a newly installed eclipse, it is not actually configured with Tomcat, so the workaround is in two steps:

1. Configure the external Tomcat

Windows, Preferences, Server, runtime environments , add ... Select the type of runtime environment, select The path of the Tomcat server software that has been downloaded

2. Build the Tomcat Library

New project, right-click on project name, Properties, Java Build Path, Libraries tab, ADD Library, Server Runtime, select Server Software name Said

Configure the external Tomcat in Eclipse and build the Tomcat library after the new project