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Unable to query for variable in History

Question asked by frank41 on Nov 18, 2013
Latest reply on Nov 19, 2013 by martin.grofcik
Hi all !
I'm trying to query for a process variable value- since the process has ended at the time of the Query, I'm using the History Service.
So I guess I'd need first HistoricDetail:

   List<HistoricDetail> details = historyService.createHistoricDetailQuery().processInstanceId(procId).list();

However the details' list is empty. Do you have any idea that brings me in the right direction?