What i understood is, since you are getting the proxy object, which should be of type VehicleEntity, and target object in that proxy object should be CarEntity.
So, in my opinion, you could deproxy the proxy object, so you could get the hold of real object which would be CarEntity.
Then, you could call the special member of CarEntity.
I have found the link, which would deproxy the proxy object in generic manner (since you had a lot of inherited classes)
Converting Hibernate proxy to real object
Hope it help..
