code: private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
  		in.defaultReadObject();
  
  		// kryoRegistrations may be null if this value serializer is deserialized from an old version
  		if (kryoRegistrations == null) {
  			this.kryoRegistrations = asKryoRegistrations(type);
  		}
  	}
docs: --------------------------------------------------------------------------------------------