Finally got all my software updated to Kotlin 1.4.0 since most of the artifacts have been published! Still waiting on Ktor though, guess that'll have to wait until Monday

I am trying to use kotlin/jvm with neo4j and I end getting

MalformedClass Name

Why is this?

Wouldn't be surprised if this was asked already, but are there any plans for official vscode kotlin extension? I think this would help a ton with kotlin adaptation on the web and as a scripting language

Could anyone with experience with Kotlix Serialization take a look here and tell me why I can't deserialize all

null

Int

as

0

? https://gitpod.io/#snapshot/eee0ffb1-3cd0-428c-b59a-1b314243ecc6

(obviously S is generic)

I have one question. I recently read [“Null is your friend, not a mistake”](https://medium.com/@elizarov/null-is-your-friend-not-a-mistake-b63ff1751dd5) by Roman Elizarov. So I found out that I shouldn’t avoid null, I should use it properly. And that is philosophy of Kotlin. If so, Why is there no

indexOfOrNull

function in Kotlin? According to Roman Elizarov, Null is the cleanest and most obvious way to indicate that there is no value. But There is only

indexOf

function that return -1 in kotlin.

Does the kotlin plugin

no-arg

work with kotlin multiplatform? I have this

gradle

configuration

plugins {
    kotlin("multiplatform")
    kotlin("plugin.noarg")
}

noArg {
    annotations("kotlinx.serialization.Serializable","org.neo4j.ogm.annotation.NodeEntity")
//    annotation("org.neo4j.ogm.annotation.NodeEntity")
}

I also have this class

@Serializable
@NodeEntity
open class UserAccount(
    @Id
    @GeneratedValue
    override var id: Long? = null,
    override var uid: String = "",
    val name: String,
    val permits: List<String> = listOf(),
    override var deleted: Boolean = false
) : Neo4JEntity

But after compilation, I get this compiled JavaCode

@kotlinx.serialization.Serializable @org.neo4j.ogm.annotation.NodeEntity public open class UserAccount public constructor(id: kotlin.Long? /* = compiled code */, uid: kotlin.String /* = compiled code */, name: kotlin.String, permits: kotlin.collections.List<kotlin.String> /* = compiled code */, deleted: kotlin.Boolean /* = compiled code */) : tz.co.asoft.Neo4JEntity {
    public companion object {
    }

    @kotlin.Deprecated public constructor(seen1: <http://kotlin.Int|kotlin.Int>, id: kotlin.Long?, uid: kotlin.String?, name: kotlin.String?, permits: kotlin.collections.List<kotlin.String>?, deleted: kotlin.Boolean, serializationConstructorMarker: kotlinx.serialization.SerializationConstructorMarker?) { /* compiled code */ }

    public open var deleted: kotlin.Boolean /* compiled code */

    @field:org.neo4j.ogm.annotation.Id @field:org.neo4j.ogm.annotation.GeneratedValue public open var id: kotlin.Long? /* compiled code */

    public final val name: kotlin.String /* compiled code */

    public final val permits: kotlin.collections.List<kotlin.String> /* compiled code */

    public open var uid: kotlin.String /* compiled code */

    public final fun ref(): tz.co.asoft.UserAccountRef { /* compiled code */ }

    @kotlin.Deprecated public object `$serializer` : kotlinx.serialization.internal.GeneratedSerializer<tz.co.asoft.UserAccount> {
    }
}

As you can see, It surely has no a no argument constructor. How do I achieve this?

Uhhh... how do I create a Kotlin library that can be used as-is in Java that doesn't reference kotlin.jvm.Intrinsics?

is 1.4 out?

Hi all, I have saw news, blogs, job posts @ JetBrian says, that Jetpack Compose going to be ported to other platforms, is iOS one of these platforms and how far we are from having this production ready?

(slightly prematurely) looking at 1.4, and seeing a new compiler warning I don't quite understand. In the following class: https://github.com/trib3/leakycauldron/blob/master/testing/src/test/kotlin/com/trib3/testing/db/DAOTestBaseTest.kt lines 30 and 48 both look like:

var reached = false

With 1.4, line 30 triggers the following warning, but line 48 does not:

DAOTestBaseTest.kt: (30, 23) Variable 'reached' initializer is redundant

I can fix by replacing with

var reached: Boolean

, but would like to understand why the 2 instances are being treated differently first.

Kotlin 1.4 Released with a Focus on Quality and Performance You can read this blog post in other languages: 日本語, Français, 한국어, Español, Português, Русский, 简体中文 Today we’re releasing Kotlin 1.4.0! Over the past years, we’ve been working hard on making Kotlin a programming language that is fun, enjoyable, and productive to work with. To continue our pursuit of this goal with this version of […]

Is it recommended to write contracts for my functions? I want to have this function

inline fun measureTimeMillisWithContract(block: () -> Unit): Long {
    contract {
        callsInPlace(block, EXACTLY_ONCE)
    }
    val start = System.currentTimeMillis()
    block()
    return System.currentTimeMillis() - start
}

but as it requires me to add the

@ExperimentalContracts

annotation, I don't really feel good to use contracts.

Kotlin `IntRange`s don't hold any values in memory by themselves, is that right? I'm asking because my experience tells me they should be lazy, yet they are not `Sequence`s, so it's possible to get one from with

asSequence()

instead. And something like a direct

map

gives you a list. But I would still assume a range object doesn't contain anything, simply because "it makes sense" in my head.

>>> (0..4).asSequence()
res0: kotlin.sequences.Sequence<kotlin.Int> = kotlin.collections.CollectionsKt___CollectionsKt$asSequence$$inlined$Sequence$1@7bafb922
>>> (0..4).map { it * 2 }
res1: kotlin.collections.List<kotlin.Int> = [0, 2, 4, 6, 8]

So what's in an

IntRange

before applying anything? (no

asSequence()

) for example

val myRange = 0..4

Can I just say that I'm still groaning about the fact the Kotlin Team decided to label a section "expect fun"?

Hi folks, any one getting this exception on Kotlin 1.4 ?

java.lang.NoSuchMethodError: kotlin.jvm.internal.FunctionReferenceImpl.<init>(ILjava/lang/Class;Ljava/lang/String;Ljava/lang/String;I)V

at line 62 ( in 1.3.72 was working )

Does anyone know how difficult it would be to use Kotlin to create a standalone JVM application and ship it? I believe a few years ago the JVM added a way to ship your application so that it could run without requiring a JVM installed on the client machine. I've just never done it before.

I'm struggeling with kotlin-main-kts that does not resolve transitative implementation and runtimeOnly dependencies. I would rather not set all my library dependencies to api. Should it be like that? Is there a more suited channel to ask?

In 1.4 there seems to be limitation for functional interfaces - suspend functions are not supported. Why? Is it final language design decision or temporal limitation of some kind?

fun interface Plugin {
  suspend fun onFinish()
}

‘suspend’ modifier is not allowed on a single abstract member

Am I correct that using 1.4 the correct replacement of

x.maxBy { ...}!!

is

x.maxByOrNull { ...}!!

and that there is no replacement that throws if the result is null?

Ouch! 😄 Ktolin 1.4.0:

Caused by: java.lang.NoClassDefFoundError: kotlin/jvm/internal/KTypeBase

Seems to be a problem with spring.

can you reference internal stuff in test sources in kotlin 1.4? 1.4.0-rc worked fine, after upgrading plugin and dependencies I keep getting

Cannot access 'Foo': it is internal in 'some.package'

gradle builds and runs it just fine tho

I fork the Kotlin project. To build and run test code, I followed the official document exactly as it was.

./gradlew -Dhttp.socketTimeout=60000 -Dhttp.connectionTimeout=60000

But it fails with this error.

Exception in thread "main" java.lang.RuntimeException: Timeout of 120000 reached waiting for exclusive access to file: /Users/iLand/.gradle/wrapper/dists/gradle-6.6-bin/dflktxzwamd4bv66q00iv4ga9/gradle-6.6-bin.zip        at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65)        at org.gradle.wrapper.Install.createDist(Install.java:48)        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:107)        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:63)

How can I run the test code of the project?

Is there a shortcut to turning on the new IR for

compileKotlin

and

compileTestKotlin

at the same time? I just ran into an issue where I forgot to turn it on for tests (and it took far longer than it should have to realize my mistake and what the compiler was complaining about).

Are there any pros/cons to using the new IR backend right now? Once the compiler API is stabilized obviously we’ll want to use the IR backend to support multiplatform plugins, but are there any benefits currently?

what's the rationale behind

UInt.rotateLeft

and

UInt.rotateRight

being normal functions and not

infix

?

Has anyone had trouble compiling a Spring + Kotlin project from Maven through

mvn clean install

, but had it compile and run from a Spring Boot configuration in Intellij? It works on 1.3.72, but not on 1.4.0. My 1.4.0 pom with just the version is linked: https://gist.github.com/csturtevant/e757a961344560d00ea08823a5cec3a1

Hi everyone! Kotlin 1.4 plugin still not showing in Intellj 2020.2. It's weird because in Android Studio it upgraded right away...

Hello, Im migrating an app from RxJava to Kotlin Flow. But, I can't find something that works like

PublishSubject

from RxJava. Does anybody have a sample of how to achive this?