Запись в базу данных JSP + сервелет

package servlet;
 
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import security.Users;
import java.sql.*;
import javax.servlet.RequestDispatcher;
 
public class DBserv extends HttpServlet {
 
    private Statement stmt = null;
    private ResultSet rs = null;
    private Connection connect=null;
 
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
    }
 
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
 
        String firstName = request.getParameter("firstName");
        String lastName = request.getParameter("lastName");
        String sex = request.getParameter("sex");
        String sqlQuery = "INSERT INTO  infotable (name, lastName, sex) "
                + "VALUES ('"+firstName+"','"+ lastName+"','"+ sex+"')";
 
        ConnectionManeger manager = new ConnectionManeger("config\\config.properties");
         connect = manager.getConnect();
        sqlExecute(connect, sqlQuery);
        
        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/db.jsp");
        dispatcher.forward(request, response);
        
    
        
 
    }
 
    @Override
    public String getServletInfo() {
        return "DBserv";
    }
 
    public void sqlExecute(Connection conn, String sql) {
        try {
            stmt = conn.createStatement();
            stmt.executeUpdate(sql);
        } catch (Exception e) {
           
        } finally {
            try {
                stmt.close();
                conn.close();
            } catch (SQLException sqle) {
                sqle.printStackTrace();
            }
        }
    }
    
}