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

[Ashok Mor]

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

    
   <map name="instances" cascade="all">
      <key column="PROCESSINSTANCE_" />
      <map-key column="NAME_" type="string"/>
      <one-to-many class="org.jbpm.module.exe.ModuleInstance" />
    </map>

So any clue in this?

[Emanuel Kadziela]

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.