Java Filter to redirect users who are not logged in to login page

Question

I was trying to make a filter to stop users who are not logged in from accessing certain pages.For this i made a filter class with the following doFilter method

Answer 1

I believe that you should either invoke sendRedirect OR doFilter. E.g.

if (requiresLogin)
  response.sendRedirect("/login.jsp");
else
  chain.doFilter(req,resp);