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In the Basic example, the external applications communicate using the same protocol, JMS. ThereforekTherefore, they could communicate directly with each other. The Basic example is a simplification to enable us to concentrate on the logical flow of the messages rather than the details of transforming one type of message into another.

A common scenario in which an enterprise service bus is used is for a Web-based form application to request data from a legacy application, such as Peoplesoft. The Web-based form communicates via HTTP which the legacy application does not understand. Using the ESB, the for apps to communicate is: external app to resoure adapter to binding component, message based through NMR to another binding component, from there to resource adapter to other application. The following diagram illustrates the a typical ESB and application integration:communication between the applications would flow like this:

1. U
   legacy/external app <-- resource adapter <-- |binding component (inside ESB) --> NMR -->
   binding component |--> resource adapter --> legacy app.

In comparison, the Basic example, looks like the following diagram. This is a simplified diagram of the basic example. For a complete diagram, please see: xxxx.

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