Since you have different tables for Individual and User, you cannot use ojbConcreteClass which is used when you map all types in the inheritance hierarchy to the one table. In your case, there are two possible mappings: either you don't need a table for the abstract class because it does not contain common fields, in which case you have in the db two separate tables for Individual and for User, or you need to use "super"-references from the Individual and User descriptors to the descriptor of the base class. In both cases, you should be able to query directly for Individual instead of for the base type ?!
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