you are probably hitting this bug:
http://jira.jboss.com/jira/browse/JBPM-1043
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The exact exception which I get on the console is:
anonymous wrote :
| [exec] 11:25:33,259 DEBUG [JobExecutorThread] querying for acquirable
job...
| [exec] 11:25:33,415 ERROR [STDERR] org.hibernate.HibernateException:
null index column for collection: