I recently downloaded and installed the latest version of Eclipse (3.4.0 aka Ganymede) and ran into some issues when trying to get Subclipse (plugin for subversion) up and running.

Initially I was getting the following error message when accessing Windows->Preferences->Team->SVN->SVN Interface dropdown:

JavaHL (JNI) Not Available

When attempting to view a repository via the "SVN Repository Exploring" perspective I got a different error message:

Unable to load default SVN client

I have always had trouble reliably and dynamically finding what my application root was in PHP. There seemed no way to effectively determine what the application root was on the fly. I always keep my application root separate from my www root for security considerations. This knocks out using $_SERVER['DOCUMENT_ROOT'].

The Issue

Consider the following directory structure:

/path/to/domain.com
  --> app/
        --> includes/main.php        
  --> www/
        --> index.php
        --> admin/index.php