HelloServlet.java

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        resp.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = resp.getWriter()) {
            out.println("<h2>Hello from E-commerce Shopping Portal (Servlet)</h2>");
            out.println("<p><a href='" + req.getContextPath() + "/index.jsp'>Back to Home</a></p>");
        }
    }
}