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You create your BPM 11g process with a start event that has a message. That makes it a service. Then you can access this service from an external system.
In general, you don't access the Task Service, although you could, for complex use cases/customizations. I don't think that is what you need here.
I created an process with a message start event and can call it from an external web service call. I can also pass input arguments and map those to process data objects. However I can not find how to return data as response to the external web service call as e.g. the process instance id.
Is it possible to this?
Gert Jan Kersten
You can return data from a process to the external caller by setting up a data object in the End event.