[AJAX] ajax jquery et servlet java

Bonjour.
Pourquoi cela ne fonctionne pas ?

Code:

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$("#coffre").submit(function( event ) {
			  event.preventDefault();
			var  mail = $('#mail').val();
			var  motPasse = $('#motPasse').val();
			clics=0;
 
 
			$.post('exemple/Reponse.java', {
                mail: $('#mail').val(),
                motPasse: $('#motPasse').val()
         },
         function(data, status){
           alert("Data: " + data + "\nStatus: " + status);
         });
		})

voici la servlet Reponse.java.

Code:

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 package exemple;
 
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;
 
 
@WebServlet("/Reponse")
public class Reponse extends HttpServlet {
	private static final long serialVersionUID = 1L;
 
	public Reponse() {super();}
 
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String data;
		String mail = request.getParameter("mail").trim();
		String motPasse = request.getParameter("motPasse").trim();
 
 
		if(mail == null || "".equals(mail) || motPasse == null || "".equals(motPasse)){
			data = "fail";
		}
 
		data ="success";
 
		response.setContentType("text/plain");
		response.getWriter().write(data);
	}
 
}

j'ai comme message d' éreure

Citation:

Unchecked runtime.lastError: The message port closed before a response was received.