Ah, a Hibernate/Spring thingy.  Thanks for the info; I'm glad you knew
something about this.  I was about to head off into left field.

You're into vendor-specific extensions, if you want it to happen
"automatically".  On the other hand, I've had good luck with a pattern
like this for mapping enums to non-obvious values, which you could
probably bend into something like what you want.

public enum Type {
 FOO (33), BAR (23);

 public final int value;

 private Type (int value) { this.value = value; }

 public static Type getByValue (int value) {
   for (Type t : getValues ())
     if (t.value == value)
       return t;
   return null;
 }
}

@Entity
public class HasAFoo implements Serializable {
 @Id private int id;
 @Basic private int typeId;

 /* Public c'tor, get/set for id, _NO_ get/set for typeId */

 @Transient
 public Type getType () { return Type.getByValue (typeId); }
 public void setType (Type type) { typeId = type.value; }
}

The entity itself is responsible for converting between the external
representation of a property and the internal/column representation.
There's nothing preventing you from mapping a single logical property
to many columns, or to an XML document in a TEXT or VARCHAR(*) column
this way.

HTH,
-O