database not get updated

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database

servlet

Sir,below program is to connect servelt to DB createaccount. not getting what is the mistake in it.database is not updated. can you please tell me the solution?

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        

        String fname=request.getParameter("fname");
        String lname=request.getParameter("lname");
        String gender=request.getParameter("gender");
        String dob=request.getParameter("dob");
        String addr=request.getParameter("addr");
        String email=request.getParameter("email");
        String phone=request.getParameter("phone");
        String duname=request.getParameter("duname");
        String dupwd=request.getParameter("dupwd");

        try{


        Class.forName("org.apache.derby.jdbc.ClientDriver");
        Connection conn = DriverManager.getConnection("jdbc:derby://localhost:1527/ers","root","root");
        Statement stmt = conn.createStatement();
        String sql = "insert into app.createaccount values('"+fname+"','"+lname+"','"+gender+"','"+dob+"','"+addr+"','"+email+"','"+phone+"','"+duname+"','"+dupwd+"')";

        System.out.println(sql);
        int s=stmt.executeUpdate(sql);
        if(s==0)
        {
           request.getRequestDispatcher("CreateAccSuccess.jsp").forward(request,response);
        }
 else
        {
            request.getRequestDispatcher("CreateAccFailure.jsp").forward(request,response);
 }

    }catch(Exception e )
    {
        e.printStackTrace();
    }
    }