Hello

JBPM allow to use timers with task instance, where timer has it's own due date 
not related to task due date. Timer's due date cannot be changed after timer is 
created (at least using API provided i.e SchedulerService or JobSession). 
Sometimes it is required to change due date for timer associated with task 
instance after task instance is created, and I haven't found standard way of 
doing this in JBPM. 

Here is how I think this could be implemented and I would be glad to get your 
opinion on this.
I believe that link between task instance due date and task timer due date is 
missing in current JBPM implementation. 
Task due date should be ignored when timer is associated with task, and task 
instance should be initialized with timer due date.
Upon change of task due date, we should look whether task has timer associated 
and if yes, timer instance should be found and updated with new due date value.
Another approach could be not to change dates in existing timers but cancel 
timer and create new one using existing timer declaration.

What do you think ?

Thanks a lot !


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