Passing arraylist form servlet to jsp

Question

i have problem with passing array object from servlet to jsp. When i try to pass it to jsp i get NullPointerException but if i print that object in servlet i have all data.

Servlet :

ResultSet rs = conn.createStatement().executeQuery("SELECT * FROM APP.CUSTOMER");
        CustomerBean customer = null;
        List<CustomerBean> list = new ArrayList<CustomerBean>();
        while (rs.next()) {
            customer = new CustomerBean();
            customer.setCustomer_id(rs.getInt("CUSTOMER_ID"));
            customer.setName(rs.getString("NAME"));
            customer.setPhone(rs.getString("PHONE"));
            customer.setEmail(rs.getString("EMAIL"));
            customer.setCity(rs.getString("CITY"));
            list.add(customer);
        } 
       request.getSession().setAttribute("list", list);
       RequestDispatcher disp;
       disp = getServletContext( ).getRequestDispatcher("index.jsp");

       disp.forward(request, response);

JSP :

<%  
    // retrieve your list from the request, with casting 
    ArrayList<CustomerBean> list = (ArrayList<CustomerBean>) request.getAttribute("list");

    // print the information about every category of the list
    for(CustomerBean list1 : list) {
        out.println(list1.getCustomer_id());
        out.println(list1.getName());
        out.println(list1.getPhone());
        out.println(list1.getEmail());
        out.println(list1.getCity());
    }
%>

UPDATE

Now when i have a list of data, how to display only 1 row clicking on href in new jsp. I have something like that but when i click id isnt passing :

 for(CustomerBean list1 : list) {
        out.println("<td>"+list1.getCustomer_id()+"</td>");
        out.println("<td>"+list1.getName()+"</td>");
        out.println("<td>"+list1.getPhone()+"</td>");
        out.println("<td>"+list1.getEmail()+"</td>");
        out.println("<td>"+list1.getCity()+"</td>");
        out.println("<td><a href='details.jsp?customer_id='+list1.getCustomer_id()>details</a></td>");
        out.println("</tr>");
    }

Instead of request.getSession().setAttribute("list", list); use request.setAttribute("list", list); in servlet file — Neha Shettar, Mar 28 '17 at 10:10
In which you are getting Null Pointer exception.. in servlet or jsp? — Neha Shettar, Mar 28 '17 at 11:00
Also try getting list using session in jsp i.e ArrayList list = (ArrayList) session.getAttribute("list") — Neha Shettar, Mar 28 '17 at 11:01
ok i got it and its working :) in servlet i have request.getSession().setAttribute("list", list); response.sendRedirect("index.jsp"); and in jsp session.getAttribute("list"); — Egzen, Mar 28 '17 at 11:13

score 0 · Answer 1 · answered Mar 28 '17 at 00:51

0

You are adding your list to your session

 request.getSession().setAttribute("list", list);

but trying to retrieve it from your request

ArrayList<CustomerBean> list = (ArrayList<CustomerBean>) request.getAttribute("list");

try adding it to you request

request.setAttribute("list", list);

answered Mar 28 '17 at 00:51

Scary Wombat

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Still NullPointerException :( – Egzen Mar 28 '17 at 10:59

Passing arraylist form servlet to jsp

1 Answers1