IssueTracker

Component used: Navigation
Version used: androidx.navigation:navigation-compose:2.8.0-beta01
Devices/Android versions reproduced on: emulator, API 34

I have a java.time.LocalDate in the navigation object; I want to implement a custom nav type. Even though, the navigation lib tries to obtain a KotlinX's serializer and crashes.

@Composable
internal object Destinations {
	@Serializable
	data object Home

	@Serializable
	data class List(
		@Serializable(with = LocalDateSerializer::class)
		val date: LocalDate,
	)
}

fun Test() {
	NavHost(
		navController = rememberNavController(),
		startDestination = Destinations.Home,
	) {
		composable<Destinations.Home> { ... }
		composable<Destinations.List>(typeMap) { ... }
	}
}

internal val typeMap = mapOf(
	typeOf<LocalDate>() to JsonSerializableNonNullNavType(LocalDateSerializer()),
)

internal class JsonSerializableNonNullNavType<T : Any>(
	private val serializer: KSerializer<T>,
) : NavType<T>(isNullableAllowed = false) {
	override fun get(bundle: Bundle, key: String): T? {
		val data = bundle.getString(key) ?: return null
		return parseValue(data)
	}

	override fun parseValue(value: String): T {
		return Json.decodeFromString(serializer, value)
	}

	override fun put(bundle: Bundle, key: String, value: T) {
		bundle.putString(key, Json.encodeToString(serializer, value))
	}
}

internal class LocalDateSerializer : KSerializer<LocalDate> {
	override val descriptor: SerialDescriptor =
		PrimitiveSerialDescriptor("LocalDate", PrimitiveKind.STRING)

	override fun deserialize(decoder: Decoder): LocalDate =
		LocalDate.parse(decoder.decodeString())

	override fun serialize(encoder: Encoder, value: LocalDate) {
		encoder.encodeString(value.toString())
	}
}

kotlinx.serialization.SerializationException: Serializer for class 'LocalDate' is not found.
Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.  
                 	at kotlinx.serialization.internal.Platform_commonKt.serializerNotRegistered(Platform.common.kt:91)
                 	at kotlinx.serialization.internal.PlatformKt.platformSpecificSerializerNotRegistered(Platform.kt:28)
                 	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:134)
                 	at kotlinx.serialization.SerializersKt.serializer(Unknown Source:1)
                 	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:72)
                 	at kotlinx.serialization.SerializersKt.serializer(Unknown Source:1)
                 	at androidx.navigation.serialization.NavTypeConverterKt.matchKType(NavTypeConverter.kt:118)
                 	at androidx.navigation.serialization.RouteSerializerKt.computeNavType(RouteSerializer.kt:163)
                 	at androidx.navigation.serialization.RouteSerializerKt.generateRoutePattern(RouteSerializer.kt:61)
                 	at androidx.navigation.serialization.RouteSerializerKt.generateRoutePattern$default(RouteSerializer.kt:46)
                 	at androidx.navigation.NavDestinationBuilder.<init>(NavDestinationBuilder.kt:102)
                 	at androidx.navigation.compose.ComposeNavigatorDestinationBuilder.<init>(ComposeNavigatorDestinationBuilder.kt:87)