Access Java field directly instead of using getter/setter For example, here is a Java class public class Thing { ... public int thing; public getThing() { return thing; } public setThing(int t) { thing = t; } } In Kotlin, if I want to access thing , I would do the following: val t = Thing() t.thing // get t.thing = 42 //set In the decompiled Kotlin bytecode, what I see is Kotlin using getter and setter: t.getThing() t.setThing(42) I wonder if there is a way to directly access the field t.thing instead of using getter and setter?...

Simply creating a Kotlin Multiplatform project in Android Studio 4.2 Canary 13 does not work Sorry for my lack of experience in KMM. It seems like something goes wrong when I attempt to create a new KMM project in AS 4.2 C13. The Gradle sync will never finish and the build.gradle.kts file in the KMM common module shows the following errors: Cannot access 'java.lang.Comparable' which is a supertype of 'org.gradle.api.Project'. Check your module classpath for missing or conflicting dependencies Cannot access 'java.lang.Object' which is a supertype of 'org.gradle.api.Project'. Check...

Code conversion between TypeScript and Kotlin Has anyone tried code conversion between Kotlin and TypeScript? Any libraries or starting points to recommend? Our backend is in Kotlin and clients in TypeScript. We are primarily interested in converting declarative stuff i.e. data classes to type and constant structures (Kotlin objects to JS objects). The direction should be Kotlin --> TS. Code conversion inside functions is not important right now. Thanks 1 post - 1 participant <a...

Failed to resolve: com.google.firebase:firebase-analytics Hello guys, iam very new to Kotlin and android app development in general and I am following a tutorial to create a login with firebase: <a href="https://www.youtube.com/watch?v=RYyri2W3Tho" target="_blank" rel="noopener nofollow ugc"> </a> When trying to add firebase to my app and syncing my gradle files, Iam receiving the following error message: <a class="lightbox"...

ViewPager2 must not be null in NavigationDrawer and SwipeViewTabs I am trying to link my Navigation Drawer with SwipeView Tabs, the problem is that the logcat tells me that my Viewpager must not be null, I have tried to solve this problem in many ways but could not. PageAdaper.kt class ViewPagerAdapter(fragmanetActivity: TabFragment): FragmentStateAdapter(fragmanetActivity) { override fun getItemCount(): Int = 3 override fun createFragment(position: Int): Fragment { when (position) { 0 -> return...

Can kotlin number cast type automatically? annoying thing in kotlin is when casting number in kotlin JVM example // I have this java method public static void foo(double bar){} // in java I can do this foo(10); // in kotlin I can do foo(10.0) // or val i = 10 foo(i.toDouble()) // below will showing as error in IntelliJ // The integer literal does not conform to the expected type Double :C foo(10) My question is can kotlin cast a number automatically? var a:Byte = 1 // yes val b:Int = 1 // yes a = b // what about this? val...

Unable to serialise list of interfaces using Gson Consider the following Kotlin code: import com.google.gson.Gson interface Subscription { val name: String val recipients: List } interface Recipient { val email: String } data class SubscriptionImpl(override val name: String) : Subscription { // Works if I change field type to

List

override var recipients: List = listOf() } data class RecipientImpl(override val email: String) : Recipient fun main() { val subscription = SubscriptionImpl("A").apply { recipients =...

Mik3y Usb Serial terminal Problems Hi everybody im trying to read data from arduino and xbee’s, but im stoppend, i cant read a correct data and a while bucle this is my code val response = ByteArray(8192) private val READ_WAIT_MILLIS=2000 button2.setOnClickListener { setContentView(R.layout.fragment_terminal_layout) val manager=getSystemService(USB_SERVICE) as UsbManager tvterminalRawData.append("$manager \n\n\n") val availableDrivers =...

Mapping Nested Values with Jackson What is the equivalent of the mapping nested value? For i.e.: // ... @SuppressWarnings("unchecked") @JsonProperty("brand") private void unpackNested(Map brand) { this.brandName = (String)brand.get("name"); Map owner = (Map)brand.get("owner"); this.ownerName = owner.get("name"); } } Thanks 2 posts - 1 participant Read full topic

Micronaut Kotlin Application -Out of memory exception while loading H20 Model in Kuubernetes Hi Team, Implemented Micronaut Kotlin Application using H2O Model and deployed in Kubernetes. while trying access application I am getting out of memory exception where H2O model contain 300MB and my POD free memory size is 4GM.still I am getting out of memory exception. Could you please any one help us to resolve the issue. 1 post - 1 participant <a...

Writing a compiler in Kotlin I once wrote a simple compiler using C# and the tooling I used were GPLEX and GPPG for lexer and parser of my language. I find myself wanting to write another language processor, this time in Kotlin. I have seen that if I intended to do it in Java I would be using JFlex and BYacc/J or Jay. These tools would generate a Lexical Scanner and a Grammar Parser for me but the output of these would be a .java source file. Which tools exist (or how can I use existing tools) to produce such Scanner and...

Why Kotlin does not support overloading of the assignment operator "="? Kotlin even allows the plusAssign operator “+=” to be overloaded. So, why not the assignment operator? 1 post - 1 participant Read full topic

API development with Kotlin, are there any good reference projects? Hello, I am new to Kotlin. I want to play with Kotlin for backend API development. Are there any good code projects that I am reference to ? e.g. ktor or Spring boot. (I mean a workable project with database model, logging, validation etc. ) 1 post - 1 participant Read full topic

jsBrowserTest for a multiplatform library I have a 1.4.10 multiplatform library, targeting for now js(LEGACY) and jvm, with a rather standard build script using the kotlin DSL. Since it’s a library, I don’t have any main() function. I have some questions about the jsBrowserTest task: Where is it originally defined? Grepping the whole kotlin and gradle sources didn’t help. I saw some references to metacity in the gradle debug logs. I understand it is launching a (potentially headless) browser, chosen in the js karma (I’ve read...

Feature request: Make it possible to break through everything from /test I love nested functions. When b() is called only from a(), it should, in my opinion, be defined inside a(), like fun a(){ fun b(){ //blablabla } b() //blablabla } This is great encapsulation: You won’t see b() from outside of a(), and you easily find b() in a() when you are looking for it. I like to write functions within functions within functions. A mess, you say? Not at all, as long as you always define the nested functions at the top of a function and don’t use local...

Destructuring without having to declare componentX function Hi, I was thinking along this line: kotlin could allow developer to create a class that support destructuring, but yet do not have to define componentX function for each and every class properties that could be destructured. Why can’t kotlin able to implicitly define componentX function for each and every class properties by default. This could really help reduce code clutterness and save typings. Javascript/Typescript do not even require developer to define these componentX functions in...

Compiler internal documentation Hello, I’m a student doing a MsC thesis about kotlin and optimization, and I’m interested in the internal documentation about the compiler. I was hopping to find a readme.md file in the github compiler folder (https://github.com/JetBrains/kotlin/tree/master/compiler) but unfortunately that’s not the case. I’ve searched other related sites and found the following links: <a...

Using framework with intersection type in method Hi there, I can’t find a way to use a method from the CUBA platform that has the following method declaration: (Screen is a class and LookupScreen is an interface) public LookupClassBuilder withScreenClass(Class screenClass) Now I have a class that looks like this: class Test(val browseClass: Class?) and a method where I want to call the method from above: screenBuilders.lookup(field) .withScreenClass(browseClass) … but that doesn’t compile, because of a...

How do i store multible objects in an attribute of another class? iam new to Kotlin and currently working on my first app. Iam using Firebase to create users and log them in and store some data (a link to their profile picture) in a firebase database. My next step would be to show all registered users in a list and my thought process was, that I need at least two classes to handle this: Class 1 - RegisteredUser Has a few attributes, such as userId, userName, email and methods like login(), logout() etc. Class 2 - UserManager Holds all objects of the class...

Are public attributes rather than private attributes with get/set methods common practice? In the short time I’ve been learning Kotlin, I have seen this quite a lot. Is this common practice even for professional and experienced Kotlin developers? 1 post - 1 participant Read full topic

Coroutine and withContext or not when using Webclient or AWS Async What is the best practice when i am using coroutines together with for example Spring-Boots WebClient or AWS DynamoDbEnhancedAsyncClient. Both are easy to use in suspend function but i am unsure if i should put them into an other Dispatcher or if i should run them in the global one. Most examples in the internet are executing them in the global scope without the “withContext”. But some documentations are saying “do IO stuff using the IO disopatcher”. And maybe an other question in the same...

Rename by @JvmName("Xxx") or directly use XxxKt? I write a lib in kotlin, this lib may be used by both java and kotlin. Should I rename the kotlin file(@file:JvmName) to avoid name like “XxxKt”? In kotlin, there is no such problem, in java, it is a little ugly. 1 post - 1 participant Read full topic

Simplest IDEA project for kotlin scripts How can I set up a minimalistic IDEA project just for kotlin kts scripts development (with IDE support)? I need something like this (and maybe even without gradle at all) but I don’t want to use kscript on my Windows PC. I just need IDE auto-completion and other kotlin support during script editing without any compilation as I’m going to run my scrips from command line using...

How do i store multible objects in a property of another class? Lets assume that I have two classes “User” and “UserManager”. Any instance of “User” should be added to a property “ListOfUsers” of “UserManager”. “Usermanager” should be able to delete/add new Users and get the instance of a specific user (via user id). Could someone give me some kind of example coding for something like this? 1 post - 1 participant <a href="https://discuss.kotlinlang.org/t/how-do-i-store-multible-objects-in-a-property-of-another-class/19447">Read...

Wrapped the WebSocket with Kotlin Channels and Flow Hello colleagues! I tried wrapping the WebSocket with Kotlin Channels and Flow. Perhaps you could do it more elegantly. I look forward to your comments. 1 post - 1 participant Read full topic

How to let member function and top-level function share one class name in kotlin? Detail on Stack Overflow：https://stackoverflow.com/questions/64302093/how-to-let-member-function-and-top-level-function-share-one-class-name-in-kotlin A problem is: IDEA cannot auto import companion member function as top-level function, we should import package.Xxx.Companion.xxx manually 1 post - 1 participant...

Why cant i run a mixed spring boot kotlin and java project just in eclipse? I have a mixed kotlin / java spring boot project and on eclipse this happens But if i try to run it on intelliJ, it works just fine. You can’t see in the images but the repositories.kt file has 5 JPA...

How to return generic object as return type Hi , i have an interface with get ,post like below interface IHttpClient { suspend fun post( body: Any, urlEndPoint: String ): Response suspend fun get(urlEndPoint: String): Response } which will implemented by volley or retrofit with help of DI, but currently here my response object is of type(retrofit2.Response) , but i want make this generic so that it will support any HTTP Client (volley etc…) but not sure exactly how to achieve this 1 post - 1 participant <a...

Why is the result of the computeIfAbsent lambda non-nullable? I’m not sure if this is a bug or a lack of understanding on my part, but I was surprised with the following null behavior: val testMap = mutableMapOf() testMap.computeIfPresent("test") { key, value -> null // this works } testMap.computeIfAbsent("test") { key -> null // this doesn't: "Null can not be a value of a non-null type String" } <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html#computeIfAbsent-K-java.util.function.Function-" rel="noopener nofollow...

Delegated Properties example not working (topic withdrawn by author, will be automatically deleted in 24 hours unless flagged) 1 post - 1 participant Read full topic