5 Replies Latest reply on Oct 26, 2017 8:54 AM by tech_thread

Modified process and "ClassCastException: SubProcessNode cannot be cast to HumanTaskNode"

gianmere Feb 8, 2016 5:30 AM

Hi,

In my jBPM 6.0.1 production installation I had a process with running instance.

I modified this process in a development installation and downloaded the jar file of the modified process from the Artifact Repository.

Then I uploaded this jar file in the production installation by the "Artifact Repository" in kie workbench.

Now in the production installation the instances started previously are working with the modified version of the process.

It works fine, except a task. When I tried to complete it, I get this error:

ClassCastException: org.jbpm.workflow.core.node.SubProcessNode cannot be cast to org.jbpm.workflow.core.node.HumanTaskNode

I'd like to know:

- It's correct to modify a process as I did ?

- Why I have this error ? what happens internally ? I tried a search for clues in the DB (specially in the table 'NodeInstanceLog'), but everything seems correct.

Thanks

1. Re: Modified process and "ClassCastException: SubProcessNode cannot be cast to HumanTaskNode"

calca Feb 8, 2016 8:03 AM (in response to gianmere)

- What did you change in your process? Could it be that you changed a HumanTask to be a Subprocess?
- Did you deploy your new artifact with a different version?
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2. Re: Modified process and "ClassCastException: SubProcessNode cannot be cast to HumanTaskNode"

gianmere Feb 9, 2016 5:49 AM (in response to calca)
I didn't deploy new artifact.
And I am pretty sure I didn't change from HumanTask to a Subprocess.

I thought jBPM would arrange a task for the user in this way:
jBPM loads the process from the jar file
jBPM loads the current task info from the table 'NodeInstanceLog'
jBPM tries to cast a class found in the jar file to the type read from the table NodeInstanceLog

But in the DB, the type of the task which causes the error is "HumanTask".
How does it work ?
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3. Re: Modified process and "ClassCastException: SubProcessNode cannot be cast to HumanTaskNode"

calca Feb 9, 2016 6:36 AM (in response to gianmere)

Well, NodeInstanceLog is an audit table.
jBPM will get the running process information from ProcessInstanceInfo (which is basically a serialized object).
If you changed the process and it conflicts the already running process, I think you should deploy it with a new version.
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4. Re: Modified process and "ClassCastException: SubProcessNode cannot be cast to HumanTaskNode"

gianmere Feb 12, 2016 4:21 AM (in response to calca)
Well, now I think I know what happened:
I changed some task of the new process from Human Task to Sub Process (and I forgot it :-) )
I deployed the new process with the same version of the old one (thinking it was a smart thing :-) )
The new process is incompatible with the instance serialized in the column processInstanceByteArray (which I will analize sooner or later :-) )

I will change the version number when I deploy a new version of a process.

Thanks a lot
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5. Re: Modified process and "ClassCastException: SubProcessNode cannot be cast to HumanTaskNode"

tech_thread Oct 26, 2017 8:54 AM (in response to gianmere)

I have a same problem as discussed above but in my case, column processInstanceByteArray is auto updating with the new process definition (after process modification)
Can anyone tell me why this is happening?
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