Hi Sebastien,
I have no idea.
We do not try to employ jBPM in our projects any more. During last 6 months I have tried multiple open source BPMN engines just to discover that every product forces me to engage into composing a puzzle made of plugins, property dialog boxes and code snippets written in scripting languages. Finally, we had to develop in-house solution, which works pretty well for us.
Sincerely,
Alex