Can you do anything after sendRedirect()

Question

I'm not able to test this myself as I don't have a development environment set up, but this is my question.
Is it possible to do anything after a call to sendRedirect(), e.g. setting cookies, additional checking? The javadocs say that if the response has been committed, this method throws an IllegalStateException. Is it possible to do anything after a call to sendRedirect(), such as writing to a response, adding cookies?
Here is some code which may explain my question:
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          String username = request.getParameter(USER_ID);
          response.sendRedirect(anotherUrl);
                                          // is this even possible????
          response.addCookie(new Cookie("Login", "true"));
     }

Answer 1

I just tested this with the following code:
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie[] cookies = request.getCookies();
          for(int i = 0; i < cookies.length; i++) {
               Cookie c = cookies;
               LOGGER.info("Cookie: " + c.getName() + ", " + c.getValue());
response.sendRedirect(someURL());
response.addCookie(new Cookie("Login", "true"));
Basically it will print all cookies in the request. On the first doPost, it does the redirect before adding the Login cookie. On subsequent doPost's the Login cookie was not printed out, the only cookie I found was the JSESSIONID, which was expected. So you can't set cookies after a redirect.