We are using JBPM in an application that is aggregating data from a variety of 
legacy systems.  User tasks will interact with data from and write data to 
these legacy systems.  Given this environment, what role should JBPM task 
variables play?  It seems to me that I will not want to create process 
variables that gets stored in the JBPM database as well as in the legacy system.

What component  is advisable to use to retrieve and store data?  At what point 
in the process definition (TaskControllerHandler?)?  How would the business 
analysts, then configure the tasks with the data fields required?

Thank you for any direction you may provide

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