I have a `data class` that has a parameter `metada...

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[bj0]

I have a data class that has a parameter metadata: List<Item>, and I'm creating it from a nullable with: metadata?.map { Item(it.key, it.value) } ?: listOf(). Which is compiling fine, but when metadata is null I'm getting: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull

[Andreas Sinz]

@bj0 is it possible that metadata contains nullable items? The Elvis operator catches null lists, but Item(it.key, it.value) will throw, when either key or value is null (Depending on the definition of Item)

[araqnid]

that syntax works fine for me in a small test, can you make a reproduceable test case? (being able to get such an intrinsics exception does smell)

[araqnid]

If the input to the transform is coming from XML, is your XML deserialisation library putting nulls into a property you've declared in Kotlin as non-nullable? or is the input to the transform a Java data class with platform nullability on the key/value properties?

[bj0]

it was from SimpleXML and I print to adb metadata, which is itself null, when it happens. I think it might be a compiler bug though because sometimes when I build and run it, it does not happen (i'm using the same test xml over and over)