Fasterxml: can't parse subtype from json

Question

Problem:

Fasterxml can construct an object when it use abstraction in setters. See code below

Can not construct instance of CarState, problem: abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information

Code:

@MappedSuperclass
@Inheritance(strategy= InheritanceType.SINGLE_TABLE)
public interface IState {}

public class BusState implements IState{}

//register subtype in mapper
mapper.registerSubtypes(BusState .class);   

public interface Car {
  public void setState(IState state); 
}

@Entity
public class Bus implements Car {

  private BusState state;

  public void getState(BusState state) { //Seems fasterxml doesn't use this method, instead it use Car.setState
    this.state = state;
  }
}

I can create two different methods in Bus class: one for settingIState and one for BusState. But it looks ugly.

Question:

How can I make fasterxml to construct Bus-object correctly?