@Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String id = request.getParameter("id"); StudDao sd = new StudDao(); if (request.getParameter("delete") != null && request.getParameter("delete") != "" && request.getParameter("delete").equals("trash")) { System.out.println("delete operation"); sd.delete(Integer.parseInt(id)); List list = sd.select(); request.setAttribute("List", list); response.sendRedirect("Student/form"); } }