Following does not work:

@Serializable
data class ApiResponse<T>(
    val result: T? = null,
    val error: ApiError? = null
)

call.respond(ApiResponse(result = gameEngine.newGame()))

But this does:

@Serializable
class Foo(val bar: ApiResponse<String>)

call.respond(Foo(ApiResponse(result = gameEngine.newGame())))

Using ktor + serialization My question is why? and how can i achieve the first one. I am getting

Serializer for class 'ApiResponse' is not found

for 1st approach

Hey is there a link to the Kotlin AMA session that happen today?

I'm probably missing an obvious place to look, but I've seen discussion recently of a talk that was given about the future of Kotlin, discussing decorators, support for immutable classes, other things, I can't seem to find a link to this talk. Does anyone have the link handy? (Or can tell me where I should be looking for it?)

Is there a reason why ReadWriteProperty interface does not extend ReadOnlyProperty?

Hello guys. First of all, let me introduce myself. My name is José DA CRUZ, I am Brazilian, working for Amadeus in the south of France since 2008 and I am glad to be here talking to you today. I am currently leading a reengineering program inside my organisation and I felt in love with Kotlin. 🙂 Since I did not manage to promote Kotlin (yet) as a replacement for Java in my group, I would like to start contributing to the overall Kotlin’s ecosystem. I googled about contributing to Kotlin on Youtube and I found this video here: . I did not not find anything more recent than that. If you guys have any other suggestion, please let me know. Cheers, José.

been reading on

jetpack compose

. It seems like an amazing tools. When will it be production ready, v1.0?

what is the different between

@Entity(tableName = "logs")
data class Log(@PrimaryKey(autoGenerate = true)
                 var id: Long = 0,val msg: String, val timestamp: Long)

and

@Entity(tableName = "logs")
data class Log(val msg: String, val timestamp: Long) {

    @PrimaryKey(autoGenerate = true)
    var id: Long = 0
}

Is it possible to access classes from

buildSrc

module in regular code (not

build.gradle

files)? I’ve got some strings declared there that I would like to access in runtime

Why are assignments not expression in Kotlin? Is there a limitation, or it is intended to not be an expression?

Does anyone have an article or example of using proguard with ktor (or any non-android kotlin) app?

Which JDK builds gradle project faster? OpenJDK 15 or GraalVM CE of JDK 11? Or is there a better choice?

Hi guys what's the most concise way to write this Swift code in Kotlin?

guard let type = model.type, let value = model.value, value != 5 else {
            return
        }

Anyone have any thoughts on why the sharp decline in Kotlin searches recently? Interestingly,

react native

has a similar trend. I’m just curious what would cause a sudden down-spike like that.

I saw this tweet but I'm still lost when it is a good idea to catch Throwable as there is not a very clear example provided in the tweet or I got lost reading the conversation https://twitter.com/relizarov/status/1299248297849303040?s=19

Implementing a QR code analyser from firebase. The app crashes after about 30 second with the error OutOfMemoryError: no stack trace available. Is this the memory available on my computer?

what assertion library would you recommend? AssertJ or something Kotlin specific?

Hey guys, we have created a linter (checker + autofixer) for Kotlin with a huge number of rules. Will be great if you will support it at least with a very simple thing: star on a GitHub: https://github.com/cqfn/diKTat But if you will have a chance try it in your CI/CD :) We are already added to awesome-kotlin and awesome-static-analysis, but still need some support from you!

Hey there! I’m working on an article about Kotlin, and I’m looking for a good resource that shows its recent growth, maybe even compared to other languages like Java. What are good resources out there that are independent from JetBrains (which is arguably biased ;))?

is it somehow possible to define the copy method generated by a data class in an interface? I am trying to figure out a way of refactoring some code that makes extensive use of

copy

and

equals

and being able to have an interface would help me doing the refactor incrementally. eg:

interface Test {
  val field: String
  fun copy(field: String)
}

data class TestData(override val field: String) : Test

but ofc this does not compile. I don’t think it is really doable, but hope is the last to die they say 🙂

Is this the best way to provide read only access to a mutable list:

class C {
    private val _elementList = mutableListOf<Element>()

    val elementList: List<Element>
         get() = _elementList
}

Taken from https://kotlinlang.org/docs/reference/coding-conventions.html#property-names

is there a nicer way to write this:

fun convertMaybe(record: Record?): DataObject? {
        return if (record != null) converter.buildDataObject(record) else null
    }

Can I create a nested class on a class I dont have access to? Something like

enum class Parent.Child {
    BAR, QUAX
}

where Parent is generated, so I cannot put the Child there directly

How do multiple collectors of the same flow behave? I haven't been able to find anything in the docs about it. When I try it, each new emission is sent to one of the collectors

kotlinx.coroutines 1.4.0: Introducing StateFlow and SharedFlow Today we’re pleased to announce the release of version 1.4.0 of the Kotlin Coroutines library. The highlights of the release are StateFlow and SharedFlow, which are being promoted to stable API. StateFlow and SharedFlow are designed to be used in cases where state management is required in an asynchronous execution context with Kotlin Coroutines. The […]

Sorry, didn't find better place to ask so is anyone familiar with hibernate-validator causing problem javax.validation.ConstraintDeclarationException: HV000131: A method return value must not be marked for cascaded validation more than once in a class hierarchy, but the following two methods are marked as such when Kotlin delegate interface is used? I tried to look decompiled source but I'm still not sure what is causing this

Can I assume a

mutableMapOf()

to preserve iteration order on key re-insertion like a LinkedHashMap ?

Is there any progress on determining whether unsigned ints are going to remain in the language. They were beta in 1.3 and I was hoping they'd be fully baked in 1.4, but I didn't see anything about them either way in the 1.4 docs. Does anyone know?

might sound like a completely silly question but would there be some value in having an

always

in a when block? Like

when (something) {
  FIRST_CASE -> doThis()
  SECOND_CASE -> doThat()
  else -> doSomethingElse()
  always -> andAlwaysDoThis()
}

I mean, sure, we can just write the always part outside of the when block but not when it's an expression body. Just wondering.

hello there, i have made discord bot with kotlin and dialogflow , but i am comfused in how to deploy that project in heruku since it is kotlin dsl build script project in ? or i there any better alternative to heruku?