Are you running your jbpm in a clustered jboss environment?
This happens to me too. I get such exceptions on timers sometimes. I have a few timers in
my jpdl. I think it happens when the activity the timer is on transitions to a different
activity. For some reason, the other node in the cluster complains about the row not found
for the timer. Although, the timers seem to do their job in my case. I'm also trying
to find the root cause of this issue...
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