Kotlin NPE when deserializing empty Kotlin's MutableList

[ghost]

Data class:

@Xml(name = "story-state")
data class StoryState(
        @Element(
                typesByElement = arrayOf(
                        ElementNameMatcher(type = StoryPathElement.Telling::class),
                        ElementNameMatcher(type = StoryPathElement.Actions::class),
                        ElementNameMatcher(type = StoryPathElement.GameOver::class),
                        ElementNameMatcher(type = StoryPathElement.GameWin::class)
                )
        ) val storyPath: MutableList<StoryPathElement> = mutableListOf()
)

And exception:
Caused by java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter storyPath

[sockeqwe]

Yeah, that is a java optimization, which is not playing​ well with kotlin null safety. Just initialize it with new ArrayList manually as temporary work around. Alexandr <[email protected]> schrieb am Fr., 7. Apr. 2017, 22:41:

…

Data class: @xml(name = "story-state") data class StoryState( @element( typesByElement = arrayOf( ElementNameMatcher(type = StoryPathElement.Telling::class), ElementNameMatcher(type = StoryPathElement.Actions::class), ElementNameMatcher(type = StoryPathElement.GameOver::class), ElementNameMatcher(type = StoryPathElement.GameWin::class) ) ) val storyPath: MutableList<StoryPathElement> = mutableListOf() ) And exception: Caused by java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter storyPath — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#64>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAjnrpdZKVaK3EFMKYWWmzpOMJajLnWbks5rtp-UgaJpZM4M3XiI> .