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The bus looks up the reference to the named bean instance and calls the chosen method using reflection. The client never has a direct reference to the bean instance, so it is said to accesses the service indirectly. Since the bus does not cache the reference, you can safely make changes to the service configuration, and it can be redeployed at run-time. Subsequent calls by the client will use the new reference, as expected. The client and service have been decoupled.