On the other hand, if

MyData

is

@Serializable

, then it opens the road to many formats at once. You can

JSON.stringify(obj)

or you can

ProtoBuf.dump(obj)

and to parcel it you’ll have to have some kind of a helper

Parceller

class and use it like

Parceller.writeTo(parcel, obj)

. You will not be able just to do

parcel.writeValue(obj)

, because a serializable object does not implement

android.os.Parcelable

,

Note that we are using proto2 semantics, where all fields are explicitly required or optional.

Its a shame, would proto3 not be a better target?

Continuing this discussion.

@karelpeeters Yes. It is possible write a “JS” format implementation that does exactly what you describe. We are considering to include in some future update.

Hmm why would

fun main(args: Array<String>) {
println("Hello World!")
println(JSON.plain.stringify(Foo("Hey")))
}

data class Foo(val foo: String)

throw a

ClassCastException: Illegal cast

? I'm using Kotlin-JS, so I don't have a stacktrace.

Does this library work with Android projects? I get this exception when attempting to serialize anything:

kotlin.TypeCastException: null cannot be cast to non-null type kotlinx.serialization.KSerializer<T>
                                                                                   at kotlinx.serialization.SerializationKt.serializer(Serialization.kt:23)

The code generation gradle plugin has been enabled using

apply plugin: 'kotlinx-serialization'

in

app/build.gradle

. The object to be serialized has a

@kotlinx.serialization.Serializable

annotation. Kotlin compiler version is

1.1.51

Am I missing something?

Seems like serialization doesnt work with 1.2?

Hello, I'm trying to use kotlinx.serialization with a KotlinJs project without gradle or maven (don't ask :D). I've added the serialization runtime library manually and I can compile the examples. But, IntelliJ shows errors in the code as "unresolved reference kotlinx". I've tried to install the plugin as described in "Working in IntelliJ IDEA" section, but I get this warning "Plugin 'Kotlin-serialization' was already installed". I'm using the latest IntelliJ 2017.3.1. I supose I need to add the serialization plugin to the Kotlin compiler plugin. Can this be achieved?

Hello guys, I'm using kotlinx.serialization with a JVM project. I used the annotation

SerialName

to override properties names with custom names. But when attempting to serialize an enum object, I noticed that it doesn't work. Is there any other special annotation for enums? Another solution that I attempted was to write a custom serializer for my enum class. I've successfully implemented that, but when creating a

JSON

with

unquoted = true

, I noticed that it does not unquote only the value of my custom serializer. Is this something that implemented the wrong way?

companion object: KSerializer<Status> {
        override fun save(output: KOutput, obj: Status) {
            output.writeStringValue(obj.description)
        }
...

Because kotlin has no concept of unions if I have two possible classes that can be deserialized how do I do that

I asked this question on stack overflow but maybe someone can help me here. Is about using serialization with generics to deserialize a Json response. I'm getting an error when the serialization plugin tries to generate the serializers for models with generics. See: https://stackoverflow.com/questions/48412340/cannot-parse-json-to-data-class-using-kotlinx-serialization

I'm trying to use the serialization library, but I'm getting the following when building with Gradle:

Error:Kotlin: [Internal Error] java.lang.IllegalStateException: The provided plugin org.jetbrains.kotlinx.serialization.compiler.extensions.SerializationComponentRegistrar is not compatible with this version of compiler

... My IDE uses the latest stable Kotlin plugin (1.2.21-release-IJ2017.3-1). I have included the serialization plugin in my buildscript dependencies (`classpath 'org.jetbrains.kotlinxkotlinx gradle serialization plugin0.4'). Is there something I haven't configured correctly for the plugin?

I’m trying to find a way of dealing with GeoJson (https://tools.ietf.org/html/rfc7946) in a multiplatform way. The specification indicates that the type of the property

coordinates

depends on the first property

type

. Expamples:

{
  "type": "Point",
  "coordinates": [
    100,
    0
  ]
}

{
  "type": "LineString",
  "coordinates": [
    [
      100,
      0
    ],
    [
      101,
      1
    ]
  ]
}

Trying to get serialization going — but am running into what seems to be a basic problem. Using gradle to build.. but when I try to serialize a real simple data class… I get kotlinx.serialization.SerializationException: Can’t locate default serializer for class class kotlin.Any

oh dear... this library does not seem to like me. I get

class Xy is not externally serializable

However, if I copy & paste the class into the place where I do the serialization it works. Can this library not deal with classes defined in other modules?

Guys, is there any way to serialize/deserialize

sealed class

to json (via kotlin-serialization of course)?

hoping to be able to use https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/runtime_usage.md#obtaining-serializers but can't get intellij to recognise that the method exists

okay will reask here... how/if it's possible to serialize function(s)?

where can I find documentation and sources for:

org.jetbrains.kotlin.serialization.ProtoBuf

and

org.jetbrains.kotlin.serialization.jvm.JvmProtoBuf

?

no, any tool is ok

what I've done is have a

Data

class with nullable fields, and a

Base

class with a custom serializer which calls

input.readValue() as Data

in

load

and checks the null fields and constructs the right subtype

or alternatively, so serialize a sub-object to

Map<String, Any?>

since I don't have a strict structure for it

Hi! I'm trying to use this to serialize messages to JSON -- I have a bunch of polymorphic definitions (see here: https://gist.github.com/jdkula/781c0edf83943df5e6dc9293f487029e) but I'm getting this error:

java.lang.IllegalArgumentException: Can't locate polymorphic serializer definition

(full stack trace: https://gist.github.com/jdkula/511b45a5de8224775418a39c23199d84) I'm compiling to Javascript from a common module. I'm using Kotlin 1.2.30.

Hello guys, which library you can recommend for using with protobuf? Also, would be pleased if it can deal with data-classes and/or deserialize JSON as well

So I was going to experiment with the kotlinx.serialization library today but installing the plugin for it breaks the kotlin plugin in intellij. The autogenerated error message the IDE gives just says null so I can’t submit the report from inside the IDE either. I saw a ticket that described this problem on youtrack but its closed. Anyone know of how to get this working?

kotlinx.serialization is doing some weird name mangling when stringifying to JSON:

JSON.stringify(UserRegistrationRequest("Jonathan"))

Outputs:

{
  "user_name": "Jonathan",
  "message_name_fojwga$_0": "user_request",
  "SENDER_SIDE_x0f2y$_0": {
    "name$": "CLIENT",
    "ordinal$": 1
  }
}

Where

UserRegistrationRequest

is:

@Serializable
class UserRegistrationRequest(val user_name: String) : SpyfallMessage {
    override val message_name = Companion.message_name // Overrides from interface SpyfallMessage
    override val SENDER_SIDE = Side.CLIENT  // Overrides from interface SpyfallMessage
    companion object {
        const val message_name = "user_request"
    }
}

I created a solution of this problem: https://github.com/Kotlin/kotlinx.serialization/pull/99

Hi, is it possible to use kotlin serialization https://github.com/kotlin/kotlinx.serialization with Spring?

Hello, Do you have an example of how to use

@SerialInfo

? I would like to use for deserialization. If a value is an empty string, I replace it by "NONE"

There is no AST for Json in

kotlinx.serialization

yet, but it’s planned