Hello, I have data class with Collection, and I want this collection to be non-null, but field is marked as Optional annotation with emptyList default. If JSON contains appropriate field with null value, Exception

Expected class kotlinx.serialization.json.JsonArray but found class kotlinx.serialization.json.JsonNull

is thrown. Is it possible to ignore that null value in json?

so it seems like i cannot parse

Map<String, List<Field>>

,

Field

is a custom type the error says just

> Invalid JSON at 4617: Expected '}'

the index seems to match up with the end of the file and the json seems correct to me is there any known problems with nesting lists in maps ?

Is there a way to have a property name different than the json key, other than having a custom serializer?

would like it to return

{"mandatory":3}

instead

Hello, i'm trying to write a custom serializer and i'm getting an exception:

Can't locate argument-less serializer for class kotlinx.serialization.json.JsonObject. For generic classes, such as lists, please provide serializer explicitly.

@Serializable
    class Foo {
        @Serializer(forClass = Foo::class)
        companion object : KSerializer<Foo> {

            override fun serialize(encoder: Encoder, obj: Foo) {
                encoder.encode(JsonObject::class.serializer(), JsonObject(mapOf("foo" to JsonLiteral("bar"))))
            }

            override fun deserialize(decoder: Decoder): Foo {
                TODO()
            }
        }
    }

    fun main() {
        Json.stringify(Foo.serializer(), Foo())
    }

hey folks is there any issue with AS 3.3.1 and

kotlinx-serialization

plugin, as it can’t

.serializer()

generated function to be resolved? Or there is some conf I missing?

Is there a not-too-hard way to deserialize an object containing a list of items which may be incorrect without crashing the entire deserialization if one single value of one single item is unexpected? I would just like to ignore this item or something

I'm almost certain I know the answer, but caching the auto generated serializers and using them across theads is totally fine right?

I get the point of having special de/serializers but it would be sweet if annotated objects defaulted to just having a static method that handles the serialization. I would mention I'm loving Kotlins serialization. It's great. I'm also amazed at how well Kotlins plugin annotation system works.

Is 0.11.0-1.3.30-eap-125 compatible with 1.3.30-release or I should wait a bit for new release?

Hi, I'm using serialization

0.10.1

. After update to Kotlin

1.3.30

from

1.3.21

I get this error:

e: java.lang.IllegalStateException: Backend Internal error: Exception during code generation
Cause: org.jetbrains.kotlin.codegen.ErasedInlineClassBodyCodegen cannot be cast to org.jetbrains.kotlin.codegen.ImplementationBodyCodegen

It's caused by:

@Serializable(with = TaskIdSerializer::class)
inline class TaskId(val value: Guid)

@Serializer(forClass = TaskId::class)
object TaskIdSerializer : KSerializer<TaskId> {
    override fun serialize(encoder: Encoder, obj: TaskId) = encoder.encodeString(obj.value)
    override fun deserialize(decoder: Decoder): TaskId = TaskId(decoder.decodeString())
}

Is there a repository with an eap version that I could try?

If you're a Retrofit user, version 0.4.0 of retrofit2-kotlinx-serialization-converter was just released supporting 0.11.0 (since it's binary incompatible with 0.10.0)

after upgrading to Kotlin 1.3.30 and serialization 0.11.0 I'm running into

> Task :common:linkDebugFrameworkIos
e: Compilation failed: org.jetbrains.kotlin.ir.declarations.impl.IrFunctionImpl@6c61d6d9 not in vtable of org.jetbrains.kotlin.ir.declarations.impl.IrClassImpl@641449e4
.......
.......
 * Compiler version info: Konan: 1.2 / Kotlin: 1.3.30
 * Output kind: FRAMEWORK
.......

Anything I can do to get around this issue?

Just to double check but

Polymorphic serialization is now available for JS and Native

does still not mean that we can serialize a data class to a native JSON object for kotlin JS? (https://github.com/Kotlin/kotlinx.serialization/issues/116)

I've noticed, that new

kotlinx-serialization-runtime-js.js

file for Kotlin/JS is "resistant" to the DCE plugin, even if serialization is not used. It is reduced by DCE from 420KB to 165KB. The old one (0.10.0) is reduced from 374KB to 10KB in the same configuration. This has impact on the size of the output files for Kotlin/JS apps, if the kotlinx.serialization library is present in the sub dependencies, but no serialization features are used. Any idea what is the cause of this behavior? Any chance it can be fixed?

Hello everyone! Is there an option to force keys to be sorted alphabetically before the serialization?

Is there possibility to specify custom discriminator for class?

Hi, when using directly JsonObject is there any way to detect if a given property is string? and get result? eg val json:JsonObject; json["propertyStr"]?.primitive.stringOrNull ? I can see that there is booleanOrNull doubleOrNull but no stringOrNull, tried toString() but it produces quoted string

Hello everyone. How can I serialize a

Map<String, Any>

?

Here is an example of what the API sends me:

Hi, Is it possible to enumerate all classes which contain

Serializable

annotation at runtime? Maybe kotlin serializer stores this information in some hash map which can be accessed? I want find an appropriate serializer by knowing only full class name, or this can be done using reflection only?

Is there a way to obfuscate some fields when serializing a model for logging?

Perhaps this?

setListMapper(Long::class, Long.serializer())

this doesn't seem to work, are there better alternatives? do i really need to make the field a string that just coincidentally is a byte array?

With the v0.11.0 release, can GeoJSON now be supported? It looks like the polymorphism stuff was merged in which I think enables the "Discriminator external" style that GeoJSON uses

IntelliJ does a nice job with @Serializable when generating code coverage info but Jacoco still has problems (I’m guessing with annotations that Kotlin needs to fix). In any case, is anyone aware of workarounds or solutions that get Jacoco to 100% on @Serializable code?

im trying to serialzie a

com.soywiz.klock.Year

but doing so breakd code generation... Thats my serializer:

class YearSerializer : KSerializer<Year> {

    override val descriptor: SerialDescriptor =
        StringDescriptor.withName("Klock-Year")

    override fun serialize(encoder: Encoder, obj: Year) {
        encoder.encodeInt(obj.year)
    }

    override fun deserialize(decoder: Decoder): Year {
        return Year(decoder.decodeInt())
    }
}

And thats how i use it (Month is an enum class i wrote):

@Serializable
data class LocalDate(val dayOfMonth: Int,
                     val month: Month, @Serializable(with = YearSerializer::class) val year: Year) {
    init {
        require(month.isDayOfMonthValid(dayOfMonth, year))
    }
}

I’ve got this in a test in

commonTest

which refers to a class in

commonMain

which is serializable:

ClassNotFoundException: kotlinx.serialization.KSerializer

What do?