Tomcat thread par request

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

// Extend HttpServlet class
public class A extends HttpServlet {
 
   private String message;

   public void init() throws ServletException {
      // Do required initialization
      message = "Hello World";
   }

   public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
      
      // Set response content type
      response.setContentType("text/html");

      // Actual logic goes here.
      PrintWriter out = response.getWriter();
      out.println("<h1>" + message + "</h1>");
      out.println("<h2>" + message + "</h2>");
      out.println("<h3>" + Thread.currentThread().getName() + "</h3>");
      out.println("<h3>" + this + "</h3>");
      out.println("<h3> start at " + java.time.LocalDateTime.now() + "</h3>");
      try {
          Thread.sleep(1000 * 10);
      } catch (Exception e) {}
      out.println("<h3> end at " + java.time.LocalDateTime.now() + "</h3>");
      
   }

   public void destroy() {
      // do nothing.
   }
}

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <display-name>Hello, World Application</display-name>
    <description>
	This is a simple web application with a source code organization
	based on the recommendations of the Application Developer's Guide.
    </description>

    <servlet>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>A</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloServlet</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>

</web-app>