On Thu, 1 Aug 2002, SB wrote:
Date: Thu, 1 Aug 2002 07:14:08 -0400
From: SB [EMAIL PROTECTED]
Reply-To: Tomcat Users List [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Webapp - WebappServer interaction
Just curious,
Can a webapp know what appserver it is running on?
See ServletContext.getServerInfo().
The very purpose of an appserver is to keep the webapp
free from the mundane housekeeping stuff like
session management and secure access. The webapp
is completely unaware of these issues. Instead,
is it possible for a webapp to provide its own
or possibly override appserver's session management
- or say inherit these from the app server thus
extending it?
That's totally dependent on the appserver's architecture and organization.
Tomcat has mechanisms to plug replacements for things like valves, realms,
and so on -- including, as it happens, the session manager. You wwould
need to become very familiar with the internal architecture (you can
download the sources from the Jakarta web site), and in particular
understand how all of the class loaders work, before you'll be very
successful.
At least for Tomcat, and most likely for any other container, a webapp
cannot do this kind of thing at runtime -- it takes modifications to
server.xml to pull this off.
--st
Craig
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