Hi,
I have a web app which I'm running on Jetty (for my CI server) and Tomcat (in
Eclipse and for live deployment).
I have email templates which are rendered by Apache Tiles, which is backed by
JSP pages.
I would like to send an email from a background thread in my web-app (i.e. not
a request thread).
I searched around for how to render JSP pages outside of a request thread, and
found e.g. [1], [2], which suggest creating a mock Request/Response, fetching
the RequestDispatcher from the ServletContext and calling
dispatcher.forward(request,response).
I tried this, and it works fine in Tomcat. Unfortunately it doesn't work in
Jetty.
The problem is that the org.mortbay.jetty.servlet.Dispatcher class has this
line at the start of the "forward" method:
/* ------------------------------------------------------------ */
/*
* @see
javax.servlet.RequestDispatcher#forward(javax.servlet.ServletRequest,
javax.servlet.ServletResponse)
*/
protected void forward(ServletRequest request, ServletResponse response,
int dispatch) throws ServletException, IOException
{
Request base_request=(request instanceof
Request)?((Request)request):HttpConnection.getCurrentConnection().getRequest();
.. i.e. the Jetty Dispatcher will only dispatch when the ThreadLocal Jetty
Request is available in HttpConnection, or when passed an instance of
org.mortbay.jetty.Request.
This won't work for me, because I'm in a background thread, so the ThreadLocal
is null, and I don't think I should tie my application to Jetty's API by
creating a Jetty Request.
Does anyone have any suggestions about what I can do instead?
There are two angles of attack which occur to me:
1. Isn't this a bug in the Dispatcher? Why does it need to insist that the
request is a org.mortbay.jetty.Request? Why can it not forward a generic
ServletRequest?
2. Is there a way to render JSP files inside a Jetty ServletContext without
using Dispatcher.forward? (Ideally this would work on Tomcat as well, but I
don't mind too much if not.)
3. Should I detect whether I'm running on Jetty and create a
org.mortbay.jetty.Request object? Can I just create a blank instance of that
class? How should I detect whether I'm running on Jetty?
Thanks,
Rich
[1] http://stackoverflow.com/questions/1075827/execute-jsp-directly-from-java
[2]
http://technologicaloddity.com/2011/10/04/render-and-capture-the-output-of-a-jsp-as-a-string/
Richard Bradley
Tel : 020 7485 7500 ext 230 | Fax : 020 7485 7575
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