The Store-and-Forward (SAF) service enables WebLogic Server to deliver messages reliably between applications that are distributed across WebLogic Server instances. If the destination is not available at the moment the messages are sent, either because of network problems or system failures, then the messages are saved on a local server instance, and are forwarded to the remote destination once it becomes available. Communication between distributed applications is accomplished through a pair of sending and receiving SAF Agents that are configured on the local and remote server instances, respectively.
For more information about JMS Unit-of-Order, see Using Message Unit-of-Order.