Spring Date Rest - Custom Deserialization with entity associations problem

gistfile1.java

@Entity
public class EntityA {
  private String name;
}

@Entity
public class EntityB {
  
  @OneToOne
  private EntityA entityA;
}

public class EntityBDeserializer extends JsonDeserializer<EntityB> {
  @Override
  public EntityB deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    ObjectMapper mapper = new ObjectMapper();
    SpecialEntityBJson obj = mapper.readValue(jp, SpecialEntityBJson.class);
    
    //Problem: obj.entityA will not be resolved, because the type SpecialEntityBJson is not a PersistentEntity (see AssociationUriResolvingDeserializerModifier)
    return new EntityB(obj.entityA, //etc...);
    
  }
  
  //Some special Json format which does not fit to the domain model
  private static class SpecialEntityBJson {
    public EntityA entityA;
  }
}

//Tests
//curl -X POST -H "Content-Type: application/json" -d '{"name": "foobar"}' http://localhost:8080/entityA
//curl -X POST -H "Content-Type: application/json" -d '{"entityA": "http://localhost:8080/entityA/1"}' http://localhost:8080/entityB