Does JBoss Tools 3.x have a tool that will allow you to do this:

see a view with all of your entity classes

select multiple entity classes in this diagram/view to form the basis of a HQL 
select statement

automatically create the HQL and dump it in the HQL editor (assuming Hibernate 
console is setup).

And you go from there.  For example, I have this native query I'm trying to 
"reverse engineer" to HQL.  It would be nice to have the above tool:

select er.equipmentRepairId, 
  |                                         e.serialNumber, 
  |                                         ddv.description, 
  |                                         sum(erc.cost) as Cost 
  |                                              from Equipment as e 
  |                                              inner join EquipmentRepair as 
er on er.equipmentId = e.equipmentId 
  |                                              left outer join 
EquipmentRepairCost as erc on er.equipmentRepairId = erc.equipmentRepairId 
  |                                              left outer join DropDownValue 
as ddv on er.equipmentRepairTypeCode = ddv.code 
  |                                              left outer join DropDown as dd 
on dd.listId = ddv.listId  
  |                                              where e.serialNumber = 
:serialNumber and  
  |                                              dd.listName = 
:repairTypeDropDown 
  |                                              group by er.equipmentRepairId, 
  |                                              e.serialNumber, 
  |                                              ddv.description

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