Medium Description
Currently the error you get when getHandlerClass does not find the class is something like:
Class 'eZOEXMLInput' does not exists, defined in setting ezxml.ini [InputSettings] HandlerClass
But it should be more clear so the dependency on the autoload system is more obvious, something like:
Class 'eZOEXMLInput' could not be autoloaded, defined in setting ezxml.ini [InputSettings] HandlerClass. Did you remember to run bin/php/ezpgenerateautoloads.php after you added the extension?
ref:
http://ez.no/developer/forum/install_configuration/ez_4_1_online_editor_doesn_t_work