XWiki.cfg should be read as a resource if it fails to be retrieved using a direct file access

                    InputStream xwikicfgis = null;

                    // first try to load the file pointed by the given path
                    // if it does not exist, look for it relative to the classpath
                    File f = new File(xwikicfg);
                    if (f.exists()) {
                        xwikicfgis = new FileInputStream(f);
                    } else {
                        xwikicfgis = econtext.getResourceAsStream(xwikicfg);
...