Query with fields from a subclass

[Phil Scadden]

I have entity with joined inheritance subclass vis
@QueryEntity
@Entity(name = "Bore")
...
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "TYPE_ID", discriminatorType = DiscriminatorType.INTEGER)
public class Bore implements Serializable {
...
   Long id;
   String operator;
   .... ( a very long list)

and subclass
@QueryEntity
@Entity(name = "WaterBore")
...
public class WaterBore extends Bore{
   ..
    String drawer;


All goes well when I query based on fields that are only in the Bore.  (eg operator like '*Jones*'. I have been trying to create a query to hand fields in Water (say drawer like '*FRED*')

This code is fine for queries on id or operator or other items only in the Bore object

        EntityManager em = emf.createEntityManager();
        JPAQuery query = new JPAQuery(em);
        QBore bore = QBore.bore;
        BorePredicateBuilder<Bore> bpb = new BorePredicateBuilder("bore");
        bpb.parseCriteria(criteria); // this is builder which parses a complex definition from a form-based query builder  into a BooleanExpression
        Predicate wc = bpb.build();
        List<BoreProjection> bhl;
          bhl = query.from(bore).where(wc).list(new QBoreProjection(bore.id,bore.operator));
        }

This code dont not.
        EntityManager em = emf.createEntityManager();
        JPAQuery query = new JPAQuery(em);
        QWaterBore bore = QWaterBore.bore;
        BorePredicateBuilder<WaterBore> bpb = new BorePredicateBuilder("bore");
        bpb.parseCriteria(criteria);
        Predicate wc = bpb.build();
        List<BoreProjection> bhl;
          bhl = query.from(bore).where(wc).list(new QBoreProjection(bore.id,bore.operator));
        }

wc looks like containIc(boreHole,FRED)

The stack trace is
.IllegalArgumentException: Undeclared path 'bore'. Add this path as a source to the query to be able to reference it.] with root cause
java.lang.IllegalArgumentException: Undeclared path 'bore'. Add this path as a source to the query to be able to reference it.
    at com.mysema.query.types.ValidatingVisitor.visit(ValidatingVisitor.java:78)
    at com.mysema.query.types.ValidatingVisitor.visit(ValidatingVisitor.java:30)
    at com.mysema.query.types.PathImpl.accept(PathImpl.java:94)
    at com.mysema.query.types.ValidatingVisitor.visit(ValidatingVisitor.java:65)
    at com.mysema.query.types.ValidatingVisitor.visit(ValidatingVisitor.java:30)
    at com.mysema.query.types.OperationImpl.accept(OperationImpl.java:90)
    at com.mysema.query.DefaultQueryMetadata.validate(DefaultQueryMetadata.java:351)
    at com.mysema.query.DefaultQueryMetadata.addWhere(DefaultQueryMetadata.java:193)
    at com.mysema.query.support.QueryMixin.where(QueryMixin.java:420)
    at com.mysema.query.support.QueryBase.where(QueryBase.java:119)