Question

I am trying to include a JSP page after the end of a filter. I have the following code:

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws ServletException, IOException {
        try {            
            chain.doFilter(request, response);
        }
        finally {                                
                HttpServletRequest httpRequest = (HttpServletRequest) request;
                RequestDispatcher dispatcher = httpRequest.getRequestDispatcher("/WEB-INF/logging/logAppender.jsp");
                dispatcher.include(request, response); // This does not work!
                dispatcher.include(request, response); // The second time it works?                
        }
    }

Pretty simple Filter I think. However, as you can see above, for some reason calling include the first time doesn’t do anything. I am just confused and tired of debugging. I have tried calling .flushBuffer(), getWriter().flush(), all kinds of close() and still don’t understand. Any ideas would be helpful?

Answer 1

There are too many unknowns and a lot of things that can only be figured out through debugging for me to give any kind of answer. A good resource that may help you is Marty Hall’s Moreservlets book. You can read it for free at http://pdf.moreservlets.com/. Read chapter 9 on Filters.