How to fix Overload Resolution Ambiguity in Kotlin (no lambda)?

Question

I am having Overload Resolution Ambiguity error in this line:

departureHourChoice!!.selectionModel.select(currentHourIndex)

For Reference:

• departureHourChoice is a ChoiceBox<Int>, which is from java.scene.control

• currentHourIndex is an Int

• The Overload Resolution Ambiguity happens in the .select() method; It is overloaded and can accept two kinds of parameters: (T obj) or (int index).

• The .select() method allows for an item in a ChoiceBox to be selected, and you can determine which one can be selected by referencing to that item or to it's index. In this case, I want it to be selected by Index (int).

• Here is a photo of the error

How would one resolve the Overload Resolution Ambiguity?

Answer 1

It seems that you are hit by this bug as a workaround you can :

• box the currentHourIndex:

  lateinit var departureHourChoice: ChoiceBox<Int>
  ...
  val currentHourIndex = 1
  departureHourChoice.selectionModel.select(currentHourIndex as Int?)
  

• or change declaration of ChoiceBox to use java.lang.Integer instead of Kotlin's Int:

  lateinit var departureHourChoice: ChoiceBox<java.lang.Integer>
  ...
  val currentHourIndex = 1
  departureHourChoice.selectionModel.select(currentHourIndex)
  

Further reading:

• Why is Integer parameter of Java method mapped to Int and not platform type?
• Kotlin: What can I do when a Java library has an overload of both primitive and boxed type?