topic Re: Passing JPA process variable to callactivity in Alfresco Archive

Passing JPA process variable to callactivity

hheckel — Thu, 07 Mar 2013 04:10:05 GMT

Hello all,can anybody point me in the right direction, if and how JPA process variables can be passed to a call activity?Thanks and best regards,Holger.

Re: Passing JPA process variable to callactivity

p4w3l — Thu, 07 Mar 2013 06:52:08 GMT

Just define "Input parameters" in "Main config" of your callactivity object by filling 'Source' and 'Target' where source is process variable name ( can be of type JPA or not ) and target is desired variable name in called process.

Re: Passing JPA process variable to callactivity

hheckel — Thu, 07 Mar 2013 08:03:35 GMT

Thanks for the quick response.

That's exactly what I tried, but I receive the following error message:


…
Mar 7, 2013 12:58:25 AM org.activiti.engine.impl.interceptor.CommandContext close
SEVERE: Error while closing command context
org.activiti.engine.ActivitiException: Couldn't serialize value 'org.apache.openjpa.enhance.com$mycompany$myapp$jpa$model$MyJPAClass$pcsubclass@6ebe8853' in variable 'jpaParameter'
 at org.activiti.engine.impl.variable.SerializableType.serialize(SerializableType.java:98)
 at org.activiti.engine.impl.variable.SerializableType.setValue(SerializableType.java:73)
…
Caused by: java.io.NotSerializableException: org.apache.openjpa.enhance.RedefinitionHelper$1
…

Re: Passing JPA process variable to callactivity

p4w3l — Thu, 07 Mar 2013 12:40:54 GMT

For me it works on EclipseLink. My JPA objects don't implement Serialisable but maybe yours in OpenJPA they should?

Re: Passing JPA process variable to callactivity

frederikherema1 — Thu, 07 Mar 2013 15:07:19 GMT

Since activiti is using the "SerializableType" instead of the "JPAEntityType", there is something wrong:

Is activiti configured to use JPA (entityManagerFactory set on process-engine configuration)

Is the entity's ID annotated using @ID? see user guide for the requirements to use JPAVariables out of the box

Re: Passing JPA process variable to callactivity

hheckel — Thu, 07 Mar 2013 16:40:59 GMT

- Yes, activiti has been configured to use JPA
- Yes, the entity's ID has been annotated using @Id

The process variable is created and persisted prior to starting the process instance. The act_ru_variable table shows the variable as 'jpa-entity', it refers to the correct java class and it's data fields are accessible to the engine (gateways in the process definition are executed correctly based on the entity's values).
The problem occurs, when I am trying to pass the variable as a parameter to the call activity as described above.

Any ideas? Thanks!

Re: Passing JPA process variable to callactivity

hheckel — Thu, 07 Mar 2013 19:00:37 GMT

Update:

I followed the example configuration in the book 'Activiti in Action' (a "must read", btw…)

Works like a charm now.

Thanks for everybody's input!

Re: Passing JPA process variable to callactivity

ronald_van_kuij — Thu, 07 Mar 2013 21:18:25 GMT

What was the issue? Can you elaborate, so it might help others?

Re: Passing JPA process variable to callactivity

hheckel — Thu, 07 Mar 2013 21:24:29 GMT

Can't really tell what the problem was, but I did follow the documentation in the book, which seems to go a little more into details compared to the user guide.