The @Splitter annotation is also applicable to methods that expect either the Message type or the message payload type, and the return values of the method should be a collection of any type. If the returned values are not actual Message objects, then each of them will be sent as the payload of a message. Those messages will be sent to the output channel as designated for the endpoint on which the @Splitter is defined. @Splitter List<LineItem> extractItems(Order order) { return order.getItems() }