How to use Task expirationTime in jBPM6

Issue

• Our goal is to set a relative task deadline on the bpmn diagram, and get it translated to a date in the workItem context.
  • For example: Set on the diagram that the task has a 10 days pre-defined deadline. So, when it's created, the workitem handler will add 10 days from creation time and set the task deadline.
  • We are thinking about to use the task's Expiration Time field to manage the task's due date. It's simpler, and seems to be more compatible with our business requirements.