Retrieveing a var when the class changed

[frinux]

Hi,
I'm storing a variable in my process instance. I discovered that if I change a class which is used in this var, jBPM is unable to retrieve the process instance so I can't use the old process instances.
Is there a way to make possible to change the classes, and the workflow would be able to retrieve the old ones? (I am especially thinking about new versions of my program)

Thanks

[kukeltje]

Not if you store serialized classes.... afaik. But I never did/try that (partly because of these kinds of dificulties)

[frinux]

Yep that's the point, I'm storing serialized classes :-(
That would be a major problem when upgrading my program...

[kukeltje]

But this isn't specifically a jBPM problem/issue right? At least I remember this same issue from a project long time ago. Either use your own marshalling, hibernate mapping or whatever....

[frinux]

No you're right, it's not particular to jBPM. However, this is something I just found out and I wondered if there was already a solution to this issue

[kukeltje]

if you consider marshalling it to e.g. a string, or writing a hibernate mapping a solution, there is. Otherwise I think not (but I'lm no java "expert")