Referencing files from classes

Hi All,
could someone help me out with the correct procedure to reference a file (not a java class) from a class? In my situation I have a directory structure for a web app of the form:
/WEB-INF/my-config.xml
/WEB-INF/classes/datautils/AppConfig.class
(the two WEB-INFs being the same directory obviously)
This structure could end up in any directory, depending on the arrangement of the webserver, or in a jar file for instance. AppConfig.class and my-config.xml will always have the same relative relationship.
I want something like:
File file = new File(***PathToFile***);
In the AppConfig class, the problem is that ***PathToFile*** changes depending on where the app is installed and where its run from in the server.
Is there a way of say finding out the path of the class AppConfig.class and then using that to construct the path to my-config.xml?
Cheers
Matt

Thanks guys,
a couple of issues though - first baddar:
There are methods in the File API to tell me where a File is once I have located a reference to it. In my case I need to know where AppConfig.class is located before I can even find the file my-config.xml and set up a File object that wraps it. So those methods don't help me.
akalex:
That method works fine in if I am using these classes in a web app and have a Servlet context to use. I want a technique that doesn't rely on the Servlet api preferably. That way I can use the AppConfig.class in other situations. The name AppConfig.class doesn't sound like a class that would be used elsewhere I know, but in another situation I may have a general class I would like to set its behaviour with a file and use in other applications.
So the question remains - is there anyway I can find out the path that a class is in when running any kind of Java app - not necessarily in a container, perhaps just on a JVM as a standalone app.
thanks chaps
matt

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