Java error: The superclass "Javax.servlet.http.HttpServlet" is not found on the Java Bu__java

When we use Eclipse for Java Web development, this error may occur: The superclass Javax.servlet.http.HttpServlet is not found on the Java build Path. How can we solve the problem?

The errors we encountered appear as follows:

We right-click the folder with the error prompt, as follows:

We click on "Configure Build Path" as follows:

We then click on "Add Library", as follows:

We select the options listed above, and then click Next, as follows:

We then click "Finish", as follows:

We click "Normal" again to complete the setup. So that my mistakes will go away,