Exception in thread 'main' org.activiti.engine.ActivitiException: Couldn't serialize value

[demouser]

In standnalone application, when we try to execute the workflow getting the below exception

Exception in thread "main" org.activiti.engine.ActivitiException: Couldn't serialize value

[martin_grofcik]

Could you create jUnit test for the issue please?
You can follow the instructions from here:
http://forums.activiti.org/content/sticky-how-write-unit-test