I'm getting error with Ktor 1.6.1 deserializing th...

# ktor

[Robert Jaros]

I'm getting error with Ktor 1.6.1 deserializing this JSON:

kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 66: Unexpected 'null' value instead of string literal
JSON input: {"id":1,"method":"/kv/routeNumberServiceManager0","params":["null","\"ENGLISH\""]}

[e5l]

@sandwwraith

[Robert Jaros]

It works fine when I deserialize it manually.

[Robert Jaros]

@Serializable
data class JsonRpcRequest(val id: Int, val method: String, val params: List<String?>, val jsonrpc: String = "2.0") {
    constructor() : this(0, "", listOf())
}

[Robert Jaros]

Full stacktrace:

kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 66: Unexpected 'null' value instead of string literal
JSON input: {"id":1,"method":"/kv/routeNumberServiceManager0","params":["null","\"ENGLISH\""]}
	at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:24)
	at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:32)
	at kotlinx.serialization.json.internal.JsonLexer.fail(JsonLexer.kt:493)
	at kotlinx.serialization.json.internal.JsonLexer.fail$default(JsonLexer.kt:492)
	at kotlinx.serialization.json.internal.JsonLexer.consumeStringLenientNotNull(JsonLexer.kt:372)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeString(StreamingJsonDecoder.kt:234)
	at kotlinx.serialization.internal.StringSerializer.deserialize(Primitives.kt:142)
	at kotlinx.serialization.internal.StringSerializer.deserialize(Primitives.kt:138)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:63)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:32)
	at kotlinx.serialization.internal.NullableSerializer.deserialize(NullableSerializer.kt:30)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:63)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:32)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
	at kotlinx.serialization.encoding.CompositeDecoder$DefaultImpls.decodeSerializableElement$default(Decoding.kt:535)
	at kotlinx.serialization.internal.ListLikeSerializer.readElement(CollectionSerializers.kt:80)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.readElement$default(CollectionSerializers.kt:51)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.merge(CollectionSerializers.kt:36)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.deserialize(CollectionSerializers.kt:43)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:63)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:32)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
	at io.kvision.remote.JsonRpcRequest$$serializer.deserialize(JsonRpc.kt:26)
	at io.kvision.remote.JsonRpcRequest$$serializer.deserialize(JsonRpc.kt:26)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:63)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:32)
	at kotlinx.serialization.json.Json.decodeFromString(Json.kt:100)
	at io.ktor.serialization.SerializationConverter.convertForReceive(SerializationConverter.kt:161)
	at io.ktor.features.ContentNegotiation$Feature$install$3.invokeSuspend(ContentNegotiation.kt:224)
	at io.ktor.features.ContentNegotiation$Feature$install$3.invoke(ContentNegotiation.kt)
	at io.ktor.features.ContentNegotiation$Feature$install$3.invoke(ContentNegotiation.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:248)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:116)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute(SuspendFunctionGun.kt:136)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:79)
	at io.ktor.request.ApplicationReceiveFunctionsKt.receive(ApplicationReceiveFunctions.kt:116)

[Robert Jaros]

Kotlin 1.5.21, Ktor 1.6.1, serialization 1.2.2

[Robert Jaros]

It is working fine with previous versions (Kotlin 1.5.10, Ktor 1.6.0, serialization 1.2.1)

[Robert Jaros]

It seems serialization issue: https://github.com/Kotlin/kotlinx.serialization/issues/1600