HTTP Status 405 - HTTP method GET is not supported by this URL

[samarinder]

HTTP Status 405 - HTTP method GET is not supported by this URL I m getting this error when i m clicking on logout button here is the code for it.............

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;



public class LogoutServlet extends HttpServlet{
    public void doPost(HttpServletRequest req, HttpServletResponse res)
        throws ServletException, IOException {
        HttpSession session = req.getSession();
        session.invalidate();

        //getServletContext().getRequestDispatcher("/index.jsp");
        res.sendRedirect("/FirstProject/index.jsp");
    }
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {

    doPost(req,res);
}

}

I have tried but can't get it ......is there is some problem with code ,
thanks

Sam