It's the action's job to take biz objects from the service and convert them (if necessary) for display on the screen, and take data from the jsp and convert it to biz objects to send to the service. An action should do only one thing, i.e. we aren't doing actions the "multiple method" way.
For apps that use SAP, all your actions should be subclasses of SAPBaseAction. This provides automatic RFC error message handling (i.e. it takes all rfc messages and stores them into the struts actionmessages automatically). It will stop any time an rfc returns an error message. In the rare case you need to do something else (like continue other processing) when an rfc error message occurs, you can wrap a try catch on MessageRuntimeException around your service execute calls.
