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kotlinlang

Hi guys, trying to do map to a sealed class / data class structure, which is something I am used to from Scala. For example, when attempting to map from Json to something like:
```
sealed class ExampleClass {
  data class ExampleFirst(val id: Int, val name: String)
  data class ExampleAlternative(val other: String)
}```

Jackson returns a `InvalidDefinitionException`  and mentions that it cannot constrict an `ExampleClass` as no Creators exist.  I imagine there is a simple annotation to get around this, but my googlefoo is failing me.