Try:
<orion-directory>/applications/<the-application>/<the-web-app>/WEB-INF/classes/com/acme/skunk/Apa.class
Apa would be instantiated using: Class.forName("com.acme.skunk.Apa");
Try:
<orion-directory>/applications/<the-application>/<the-web-app>/WEB-INF/classes/com/acme/skunk/Apa.class
Apa would be instantiated using: Class.forName("com.acme.skunk.Apa");