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From <>
Subject RE: ServletContextListener - how to detect http path of web application?
Date Wed, 21 Dec 2005 17:17:06 GMT
Thanks, I might try that.

I already made a javax.servlet.Filter, that catches the first request to
the server, calls HttpServletRequest.getContextPath(), and stores the

Of course the Filter actually gets hit on *every single request* to the
server. You might call it a brute force solution :-)


-----Original Message-----
From: Frank W. Zammetti [] 
Sent: 21 December 2005 17:00
To: Tomcat Users List
Cc: Tomcat Users List
Subject: Re: ServletContextListener - how to detect http path of web

Tim is right, you can't do it directly.  You *might* be able to
construct it in a roundabout way though...

Let's assumg you know the method, http vs. https, and its always one or
the other.  Let's also assume that the <display-name> element in web.xml
names the application context (i.e., if the URL is
http://myserver/myapp, then <display-name>myapp<display-name>.  I
believe the following (without actually trying it) would work...

String s = "http://";
s += new InetAddress.getHostName();
s += "/" + servletContext.getServletContextName();

Kind of hack solution, but it might be OK for your application (assuming
it actually works!)

Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
AIM: fzammetti
Yahoo: fzammetti

On Wed, December 21, 2005 6:22 am, Tim Funk said:
> There is no way to detect the contextPath on servletInit. It can only 
> be done after the first request. (Using 
> HttpServletRequest.getContextPath())
> -Tim
> wrote:
>> Hi,
>> Apols for a newbie question, I didn't have much luck with the 
>> archives or in Google.
>> In my ServletContextListener.contextInitialized method, I need to 
>> detect the public http path of my web app. i.e. 
>> http://servername/approot/
>> How can I do this?
>> event.getServletContext().getResource("/") gives me 
>> "jndi:/localhost/", not very helpful.
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