Tomcat Servlet: - The requested resource is not available - eclipse

Question

I am new to writing a Java Servlet, and am struggling to get a simple servlet to work properly.
The Servlet Test1.java class is:
import java.io.IOException;
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.*;
import javax.servlet.*;
import javax.servlet.http.*;
#WebServlet("/Test1")
public class Test1 extends HttpServlet {
public Test1() {
super();
// TODO Auto-generated constructor stub
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("Hello World");
}
}
The problem is when trying to run this simple servlet the servers shows an error which is :
message : /Projet1/Test
HTTP 404 : the requested resource is not available
Projet1 is the name of the project
for web.xml i"ve removed the declaration of this servelt as i saw in many question , which says that we cant not use the annotation in the servelt and in web.xml at the same time , anyway this is web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID"
version="3.0">
<display-name>Projet1</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
for the structure and the results : Structure du projet
the result : the result after run
I am running Tomcat v7.0, and have already read similar questions, with responses referring to changing the invoker servlet-mapping section in web.xml ,
i've tried so many solutions pas no changes ! Help please .