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org.hibernate.HibernateException: null index column for collection: org.jbpm.graph.exe.ProcessInstan

 
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Hi I am getting following error

org.hibernate.HibernateException: null index column for collection: org.jbpm.graph.exe.ProcessInstance.instances

My mapping for map is something like below





So any clue in this?
 
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You did not list much code, but a quick glance at org.jbpm.graph.exe.ProcessInstance.instances seems to indicate that instances are a List not a Map, and lists should be mapped with <list> in hibernate (no <map>) and need an <index> column reference.
 
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