Folks,
to follow up on this, it seems that the simplest way to accomplish an
URLBinding to "/" is to create an "/index.jsp" -file which has the following
contents:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="ISO-8859-1"%>
<%
//
// We just simply redirect to the proper actionbean.
//
request.getRequestDispatcher( "/action/mybean" ).forward(request,response);
%>
Also ensure that index.jsp is in your welcome-file-list.
There seems to be no more performance penalty on Tomcat 6, oddly enough. You'll
just need to be careful that you have your Servlet Filters mapped properly in
web.xml, since RequestDispatcher.forward() does not rerun the filter chain.
(FWIW, I tried setting up REQUEST and FORWARD dispatchers for StripesFilter,
but got very quickly into infinite loops, which were severely detrimental to
the performance of my web site. So just map the filters you need properly for
*.jsp and you should be fine.)
This change alone bumped my Yottaa score up by 10 notches compared to just
blindly mapping action/mybean as a welcome-file. :-)
/Janne
On 29 Dec 2010, at 00:31, Janne Jalkanen wrote:
> Hi folks!
>
> I need to map the root of my site to a particular ActionBean. Now, the simple
> way to do this is of course to use a welcome-file-list in web.xml (Tomcat
> 6.0.x):
>
> <welcome-file-list>
> <welcome-file>action/mybean</welcome-file>
> </welcome-file-list>
>
> but unfortunately this carries a fairly heavy performance penalty: compared
> to accessing action/mybean directly, the performance on EC2 Large instances
> is up to 100ms slower - and I'm seeing a definite bump in CPU usage as well
> (about 5x of what I would use normally). On my local OSX box the difference
> isn't that bad, but I'm still seeing it, especially the CPU usage. There's no
> considerable IO.
>
> So it seems that the welcome-file solution is less than ideal in my
> environment, and before I go and start ripping the guts out of it (or worse,
> changing my production environment), I'm wondering if there's a simple and
> clean way to resolve this the Stripes way. I see
> http://stripesframework.org/jira/browse/STS-688 has some discussion.
>
> Would a custom Servlet Filter be the best solution here? If so, then how
> would I invoke a particular ActionBean from it?
>
> (Here's the interesting part - it's slightly *faster* to have an index.jsp
> redirecting with 302 to /action/mybean than have the /action/mybean as the
> welcome-file. However, I want to steer away from redirects, since 1) I want
> clean URLs, and 2) redirects can be quite bad for performance, especially on
> mobile networks. And 3) it bothers me that this should really be faster than
> have an extra redirect loop... I'm wondering if having an ActionBean as a
> welcome-file somehow confuses Tomcat when the file does not exist physically.)
>
> /Janne
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