How to avoid finally or avoid forward in Servlet switch case?

Question

This is the code in doPost:

try {
    switch (request.getParameter("action")){
        case "delete":
            request.setAttribute("message", "Deleting...");
            break;
        case "update":
            request.setAttribute("message", "Updating...");
            break;
        case "new":
            response.sendRedirect("createNew.jsp");     
            break;
        default:
            super.doPost(request, response);
            break;
    }
} finally {
    request.getRequestDispatcher("backHome.jsp").forward(request, response);
    out.close();
}

The problem is in the finally I'm getting this exception when the case is 'new': java.lang.IllegalStateException:

score 1 · Answer 1 · answered Mar 11 '16 at 22:26

1

In case of "new" you are doing response.sendRedirect("createNew.jsp");. At this point response stream is written.

In finally you are doing request.getRequestDispatcher("backHome.jsp").forward(request, response);. It is forwarding to another url.

But since on response already some content is written another forward cannot happen. This throw java.lang.IllegalStateException.

answered Mar 11 '16 at 22:26

Bhushan Bhangale

10,921
5
43
71

and, what can I do to solve this? can you help? – Crishk Corporation Mar 11 '16 at 22:27
Do you want to execute what is in finally for all cases? – Bhushan Bhangale Mar 11 '16 at 22:29
finally redirects, but if any other case redirects to another way don't generate exception. – Crishk Corporation Mar 12 '16 at 05:54
Extract out what you have in finally into a separate method. Call the method from ease switch case where you need it. You do not need in case "new" as its already redirecting and then you cannot forward to another page. – Bhushan Bhangale Mar 12 '16 at 11:32

How to avoid finally or avoid forward in Servlet switch case?

1 Answers1