[FIXED] Servlet 404 the requested resource [/ServletDemo/AddServlet] is not available

Issue

I just started learning about Servlets. I followed the basic steps to create a new servlet project:

File -> new -> Dynamic Web Project -> new -> Servlet (AddServlet) with a basic print statement in the doGet()

package com.demo.servlets;
//all of my imports

@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    
    public AddServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().print("Hello");
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }
}

I'll I've done is make the servlet but I can't get past this step. I've looked at a million tutorials and stack overflow answers. I made sure Tomcat 9.0 was installed and connected to my project correctly, made sure the servlet version was 4.0, made sure my build path was correct, made sure that my servlet was in a package.

I've also even tried using web.xml instead of the web annotations but I get the same 404error. . Ive been working on this for the past 72 hours, and I don't understand what the problem is.

Solution

You need to override doGet and doPost from HttpServlet. For this reason you need to add @Override annotation above the doGet and doPost.

Answered By - Mustafa Çil
Answer Checked By - David Goodson (JavaFixing Volunteer)