Hi, I am using Ktor websocket server with Netty engine, is there a way to not send data in the ping/pong frames? By default its sending garbage as payload

Hi! My team is starting to hurt from long (test)compile times and we are wondering if inheritance could be the culprit. We have an

AbstractBaseTest

class of about 2000 lines that is inherited by many of our tests, and we have read somewhere on the jetbrains blog that large classes can impact compile time. Is it reasonable to think that rewriting the AbstractBaseClass to something concrete that tests can use, rather than inherit, would improve our situation?

Hey everyone, either I understand less than I think I do or I'm over complicating the issue but... is it possible, and if so how would I implement, to set up ktor or http4k to make endpoints on my hosted webserver from hostinger to serve responses. Currently I am using php to do so but would like to covid out a way to utilize kotlin. I know I could do so with a VPS server but want to accomplish it on a hosted webserver.

🧵 hey guys, I’m facing an issue with Kotlin type system and generic class types. In particular, I’m working with Akka Typed and its

ReceiveBuilder#onMessage

signature.

Is there any "typed" type aliasing? Like regular https://kotlinlang.org/docs/type-aliases.html but that actually create new types but can be interchangeably assigned to from their underlying type?

Hey everyone, I was playing with Kafka, and looking around I didn’t really find any extension on top of the Kafka SDK for example to write

Flow

based Kafka programs. Was wondering if there would be any interest in such a library, and/or if people are interested in contributing. Or if there is an existing library already out there. I have some operators, and examples ready if someone is interested. https://github.com/nomisRev/kotlin-kafka

Hi All, I am using springboot and spring-data-jpa to create a rest-api that handles crud operations. I am using Postgresql as the DB. I can get it to work fine, however given the JSON example below I want to store the phoneNumbers, emails, addresses, urls, settings as JSON in the DB column for each one respectively. Is there a known way that this can be done? My data class is fairly simple: I have tried String, Map and Any as the data type for those fields none of which works.

@Table("organisations")
data class Organisation(
    @Id val id: UUID?,
    val name: String = "",
    val information: String = "",
    val urls: Any?,
    val emails: Any?,
    val phoneNumbers: Any?,
    val addresses: Any?,
    val settings: Any?,
    val active: Boolean = true,
    val createdAt: Instant = Instant.now(),
    val updatedAt: Instant = Instant.now(),
)

{ “name”: “Business Name”, “information”: “Business Info”, “phoneNumbers”: { “office”: “+6172345678”, “imam”: “+6142349876” }, “emails”: { “info”: “info@bus.com”, “commity”: “commity@bus.com” }, “addresses”: { “address”: “2345 SomeStreet Road, MyTOWN, 1234", “postal address”: “PO Box 123" }, “urls”: {}, “settings”: { “timeFormat”: “dd/MM/yyyy”, “currency”: “AUD” } } Any pointers or help would be greatly appreciated. Thanks

Hi, I got next case with spring boot rest api:

@RestController
@RequestMapping("/my_controller")
class MyController {

    @GetMapping(produces = [MediaType.APPLICATION_JSON_VALUE])
    fun getIds(@RequestParam(value = "ids") ids: List<Long>): List<Long> = ids
}

when I call for example:

curl -ik localhost:8080/my_controller?ids=1,2,3

all good but when my client send an empty value for example:

curl -ik localhost:8080/my_controller?ids=1,,3

the list

ids

don't check nullability and my method got

[1,null,3]

I suppose the problem around conversion from java to kotlin cause when I decompile class to java I see next

@NotNull
public List getIds(@RequestParam("ids") @NotNull List ids) {
   Intrinsics.checkNotNullParameter(ids, "ids");

there is no any nullability checking, any ideas how to fix it, and where is the root of problem? thanks.

https://aws.amazon.com/about-aws/whats-new/2021/12/aws-sdk-kotlin-developer-preview/ Does anyone know if amazon Aurora is a supported service for the kotlin sdk?

if you're using Log4j (likely if you do Kotlin server side development) this is highly relevant: https://securityaffairs.co/wordpress/125480/hacking/log4j-java-library-zeroday.html

HI, We are using kotlin with ktor server side. Do kotlin has something similar with feign client? by the way I'm new in kotlin, So any help will be appreciated. https://www.baeldung.com/intro-to-feign

HI, We are using kotlin with ktor server side. Is there a way to implement my own annotation to wrap try catch my block code? any examples?

Hi, I need generate swagger api documentation in ktor, you have any example?

Good day! 🙂 I am stuck with a dependency problem and hope someone here can help me out. I have a mono repo consisting of 5 modules. Each module is an independent Gradle project (has its own settings.gradle.kts and build.gradle.kts etc) and may or may not have included sub modules. Some of these modules are KMP projects and some or plain Java. Some modules depend on another module in this mono repo, which is always resolved by publishing the artifact to a private repo and pulling it from there. Okay so next I have an example project which uses a module from this mono repo. When I implement a module and sync the project I get this error: """Dependency resolution has ignored the cycle to produce a result. It is recommended to resolve the cycle by upgrading one or more dependencies. Detecting cycle in external variants for : dev.buijs.klutter:annotations-kmp:0.2.12: - app-backend:common:1.0""".... I'm totally baffled because this module (annotations-kmp) literally has zero dependencies. I have by now also removed every single other dep implementation in the example project. I also backtracked every package and artifact name to make sure they are all unique (hence annotations-jvm, annotations-kmp)... Source is here: https://github.com/buijs-dev/klutter

HI, We are using kotlin with ktor server side. Is there a simple way to schedule a task? In spring I just use @scheduler annotation. any examples?

Hi, another (simpler) question this time... I just stumbled upon Arrow Meta which looks interesting. I want to make a façade for flutter pigeon. Pigeon only allows a small set of class/service definitions created in dart. I would want to define said service definitions in Kotlin and make a Gradle plugin/task to generate dart classes. Using Arrow Meta, what would be the right way to do this? Just create a low-level converter which maps elements one by one? Or is there a better pattern for this?

Hi all, We are using kotlin with ktor server side. and We are using

io.ktor.client.HttpClient

To make http calls between microservices and third parties for example: When the http call succeeded the httpResponse maps automatically to my Object, but when there is error in the http call and it failed, I expect the client will throw an exception with the satatus code 40X 50X, and it's not. I need to check manually what is the status code, and decide what to do. Am I using it wrong? Do you have another client to use?

Hi everyone. Just joined here. I'm using Exposed on a server with Ktor and I need to create a query using the HAVING COUNT(*) = X sql statement, but I don't know how to.. anybody has an idea on how to achieve this?

Anyone know if there are any plan for Kotlin to support async await as well as coroutines, swift uses async await and C# has had it for a long time, async await is fairly easy to understand and keeps code clean, it would be great if it came to Kotlin so we could use the same paradigm in swift and kotlin

Hi! Do any serverless or function-as-a-service providers currently support JVM 17? As of Jan 2022 AWS Lambda only supports Java 11, same with Azure Functions. Google Cloud Functions (very specific) supports JVM 11.0.6 running on Ubuntu 18.04. Other providers like Netlify, Render.com, Vercel don't support Java at all 😞 Would love to see a service step to 17.

This works perfectly fine! However if I change it to this:

var cancel = false
var i = 0
this.forEach {
    val result = !it(using, interaction)
    println("${i++} cancelled = $result")
    if (result) {
        println("cancelling")
        return
    }
}

It prints out 4 times DOES NOT print cancelling... and then it just stops.

Hi server-siders! 🧑‍💻🏽 We are looking at some new ways to make the Kotlin experience more convenient for server-side developers, but we need your input! Answer just a few questions for a chance to win a prize 🎁 👇 👇 👇 https://surveys.jetbrains.com/s3/sl-kotlin-developers-survey

What is the recommended way to deal with passwords? I see discussions online vary between Bcrypt and PBKDF2, sometimes mentioning Scrypt, and I'm honestly quite overwhelmed with the options available.

Personally, as a user I do not want to authenticate through a third-party and give access to my personal informations. I always use an email/password combo and store everything in a password manager. Also, if one account is hacked, my other accounts are safe. Please, give your users a choice (unless its an enterprise, then some restrictions may apply of course). About your question @martmists, check OWASP's cheatsheet about password storage:

This cheat sheet provides guidance on the various areas that need to be considered related to storing passwords. In short:

• Use Argon2id with a minimum configuration of 15 MiB of memory, an iteration count of 2, and 1 degree of parallelism.

• If Argon2id is not available, use bcrypt with a work factor of 10 or more and with a password limit of 72 bytes.

• For legacy systems using scrypt, use a minimum CPU/memory cost parameter of (2^16), a minimum block size of 8 (1024 bytes), and a parallelization parameter of 1.

• If FIPS-140 compliance is required, use PBKDF2 with a work factor of 310,000 or more and set with an internal hash function of HMAC-SHA-256.

• Consider using a pepper to provide additional defense in depth (though alone, it provides no additional secure characteristics).

Does anyone know of a common interface over an Http4K

HttpHandler

& the browser fetch API that would allow using the same code to make HTTP requests in the browser and the server?

Anyone aware if it should be possible to get WebSockets running on an AppEngine setup?

Does anyone know good ways to have a clean shutdown?

exitProcess()

terminates the service without waiting for any active processes to complete. Is there a way to wait for all the active process to complete before termination?

I have a question regarding kotlinx serialization. I want to have a single superclass which has a function to print an object as JSON. The implementing classes can not have a body. Is there a way to get access to the subclass (or her members) from the superclass? Gist here to make it more clear what I want to do: https://gist.github.com/buijs-dev/f7d197bce7ab44578cf7bc1c568aa6a2 Ofcourse it does work by adding an abstract method to be implemented by the subclass, which returns a reference to said subclass. I however want to avoid having to add a body for this usecase.

Does anyone happen to know if it's possible to use the

-DEV

or

-SNAPSHOT

builds via Gradle? I've tried adding the sources in the README here: • https://github.com/JetBrains/kotlin#using--dev-and--snapshot-versions But my build doesn't seem to be able to find the versions

1.7.0-dev-911

or

1.7.255-SNAPSHOT