Initializing classes when the application starts?

Hi all,
I tried to figure this out myself but after loads of searching I found nothing, perhaps I haven't got the right search terms.
I have a web server written in Java with a BasePage class which is extended for each page in the application. What I would like to do is have each subclass automatically register itself with a static PageProcess class. The PageProcessor keeps a list of all registered pages, and can then check incoming requests against that list to decide which subclass should respond.
The problem is that constructors seem to only run when the class is first accessed, so the PageProcessor is never notified of these other pages. I used to have a hard-coded function that checked the requested url and then manually called a static boolean canHandle( String url ) function per-subclass, but as I get more pages this becomes a chore to update with more else if blocks.
Is there some kind of pattern or something I can apply to get this working? I'd like to avoid having a hard-coded list of pages to use in the application, but if that's the only real solution then I can go back to doing it that way.
Thanks,
Michael

Thanks for the reply. I had a look at doing that (via ClassLoader) as well as just checking for what .class files are present, this seems like a decent way of doing it. I had hoped that there would be a way to force the JVM to initialize classes right away rather than on first-access, but as it is I think the easiest solution will be to go back to having my static PageProcessor class have a list of all pages hard-coded.

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Initializing classes when the application starts?

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