Initializing map in companion object throws ExceptionInInitializerError

Question

Consider the following class:

sealed class Fruit(val id: String, val label: String) {
  object orange : Fruit("Citrus sinensis", "orange")
  object watermelon : Fruit("Citrullus lanatus", "watermelon")
  
  companion object {
    val values = listOf(orange, watermelon)
    val valuesByID = values.associateBy { it.id } // <<< error here
  }
}

This class compiles fine, but when it is referenced at runtime (eg: val oj = Fruit.orange) an error will be thrown.

java.lang.ExceptionInInitializerError
        at com.example.sandbox.App.<clinit>(App.kt:13)
        at java.lang.reflect.Constructor.newInstance(Native Method)
        at java.lang.Class.newInstance(Class.java:1606)

However, if the valuesByID line is removed, then the error will not be thrown. Why is this happening?

The runtime environment is Android, if that matters.

Answer 1

It is a known issue https://youtrack.jetbrains.com/issue/KT-25738 reported in July 2018.

General problem is using object which is subclass of a sealed class in its companion