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Please note: There is one caveat : with the Basic example: it uses inbound messages via the resource adapter ^{4 2}, and most legacy applications , such as Peoplesoft and SAP, won't support inbound messaging via the resource adapter.

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1. Using the distributor's web interface, a department store buyer submits an order for multiple products. An HTTP request is sent to the "OrderReceiver, an HTTP binding component (BC). ^{2 3}
2. The OrderReceiver sends the message to an "OrderRouter" Service Engine (SE) ^{3 4} component. This SE is responsible for parsing the order and deciding, based on the message content, which OrderTransformer should receive the message.
3. The OrderRouter publishes the order to a JMS topic. It decides which topic to publish to based on message content.
4. The OrderTransformer is a Service Engine component, which modifies the message and puts it in a format which is readable by the wholesaler interface that will fullfill the order.
5. Each OrderTransformer sends the modified message to the OrderProcessor.
6. The OrderProcessor is a Binding Component that has two functions. The OrderProcessor also places an order to the appropriate wholesaler through the wholesaler's Webservice or propriety interface.
7. The OrderProcessor also publishes a message about the order on a topic.
8. The message on the topic is subsequently picked up by the BusinessMonitor component. This component monitors the orders for quality assurance.

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1. External means the application is outside of the enterprise service bus.
2. Resource Adapter: a resource adapter provides connectivity between a specific external application and the ESB. In the Basic example, the resource adapter is an ActiveMQ adapter supplied by the jencks JCA Container.
3. Binding Component (BC): a BC provides connectivity to applications that are external to the ESB.
4. Service Engine (SE): a service engine provides business logic and transformation services to other components within the enterprise service bus.Resource Adapter: a resource adapter provides connectivity between a specific external application and the ESB.