[jboss-dev-forums] [jBPM Development] - Re: Migration from jBPM 3.2 to jBPM 5

[Bernd Ruecker]

Bernd Ruecker [http://community.jboss.org/people/camunda] created the discussion

"Re: Migration from jBPM 3.2 to jBPM 5"

To view the discussion, visit: http://community.jboss.org/message/617395#617395

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Hi Ratnavel.

Actually you shouldn't start such a migration lightly. We already have customers doing some migration from jBPM 3.x to other Process Engines. But since basically everything has changed (database layout, API, process definition, with jBPM 5 even some core concepts) it really some change.

Currently we made best experience with a step by step approach (see e.g.  http://www.bpm-guide.de/2010/12/24/using-bpmn-2-0-models-with-jbpm-3-a-migration-path-and-more/): http://www.bpm-guide.de/2010/12/24/using-bpmn-2-0-models-with-jbpm-3-a-migration-path-and-more/): Extract the process definition to BPMN and maybe keep the jBPM 3 by a transformation (see e.g.  http://fox.camunda.com/doc/#jbpm3Bpmn http://fox.camunda.com/doc/#jbpm3Bpmn). Abstract the Process Engine (with a layer like  http://fox.camunda.com/doc/#peal http://fox.camunda.com/doc/#peal). Afterwords exchanging the engine is more a architecture/framework thing and you can migrate process by process. There I think migrating instance data should be avoided if somehow possible, it is really complex :-)

Cheers
Bernd
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