Scenario Message Flow

The example scenario message flow works as follows:

• The client application, acting as a web service, sends a message to a message queue.

• The message is picked up by a message driven bean (MDB).

• Upon receiving the message, the MDB contacts the NMR using the Java EE Service Engine, for the service endpoint that is exposed by the BPEL process.

• When the MDB executes, the BPEL application that is hosted by the BPEL service engine, contacts the NMR to find its partner services.

• In the example, only one partner service, the stateless session bean (JSR 109 web service) is hosted in the same Application Server JVM instance. The JSR 109 web service's is enabled in the NMR by the Java EE Service Engine when the stateless session bean is deployed.

• The stateless session bean then uses Java EE persistence APIs to access the database.