Created attachment 788387 [details] stack-trace Description of problem: The new TaskImpl class uses the 'taskId' attribute as id. The old one used just 'id'. This prevents the creation of e.g. LocalTaskService which fails with error 'ERROR: column taskimpl0_.taskid does not exist'. See attached log for full stack-trace.
Ok this is related with this fix: https://github.com/droolsjbpm/jbpm/commit/9b274ffa840ad0e56fb552b1f6384a9f9627e260 I can try reverting the Column names to see if that fixes the problem and a migration script can be avoided.
Fixed in master: https://github.com/droolsjbpm/jbpm/commit/d2a5d57e45146386409901d434ed5583981e8f9f It will be backported to 6.0.x
Verified on ER4.