moved to proper forum
This is a community forum, don't expect to get a step by step migration tutorial. Each scenario is different and it really depends on how your processes look like. I wound't recommend an automatic tool for the job either.
You will need to learn about the BPMN2 spec and based on your existing processes manually translate those to the new modelling language (which express a different execution semantic) .
I recommend you to start simple, with the most basic ones and then move forward to more advanced cases when you feel comfortable enough with the BPMN2 syntax.
ok, can u give me an example just to know how to start ? thank u
An example of what? I recommend you to take a look at the latest KIE-Workbench where you have the process designer, task lists and process lists. Inside the KIE Workbench a set of processes are defined so you can take a look at those.
As Mauricio said, what it what you are trying to migrate?
I mean, how are you using jBPM3 in the current system? Do you have your custom UI? Is this task oriented? How does your processes look like? You will have to migrate them to jbpm 3 language to BPMN2.
Here people will give you some guideance, but you will have to learn a bit the basis of jbpm5/6. I recommend starting with the official documentation and if possible also the jBPM5 Developer's Guide book.
I need to migrate start-states forks and joins tasks,...