Mike, Your error message sounds to me like a sandbox security type of an error message. When you installed CF10, perhaps you went with the secure settings. You may have to go into the admin and allow java objects to be instantiated or something along those lines.
Also, it seems like one option to your class loading issue would be to put your POI functionality into its own "application" and then use the javaSettings application variable. Probably not much help, Jason
