Entry point classes define onModuleLoad().
The appName (URL "app") for a Java-based Xholon app,
must be exactly the same as the Java Application class excluding the initial "App".
For example: class AppHelloWorld converts to "HelloWorld" as the appName.
But note: class App09SpatialGames converts to "_09SpatialGames" as the appName.
The method names used in this class are also exactly the same as the appName.
This is consistent with the class name returned by calling Application.getJavaClassName(),
that's specified in the _xhn.xml file.
This guarantees a consistency that allows apps to store themselves as named items in localSorage.