kotlinlang #server

Hi all, I am building USSD integration for our app and my telco requires my integration app to be both a SOAP server and client. Can I support these with ktor or spring is the way to go?

Ricardo de Vries

10/08/2021, 11:59 AM

Hi everyone, just landed in this channel after a talk by Anton Arhipov 🙂 I'm currently building a web application in Kotlin using Quarkus as a framework. I'm trying to use generic repositories (for databases) and resources (for REST) to reduce my code. I created a test entity called Fruit which I then use in my FruitResource, which inherits the GenericResource. The Fruit object goes from the FruitResource, to the GenericResource, where I use it to instantiate a GenericRepository, and then do all the magic. The error I'm getting only says something about an unsatisfied dependency of the GenericRepository, which I'm instantiating in the constructor of the GenericResource with a generic (would be Fruit in this case). Does anyone have an idea what I'm doing wrong?

Hamza Ahmad

10/13/2021, 11:56 AM

Hello everyone, I am creating app using KMM and one thing I want to know that is FTPClient supported in shared module? if no then what is alternative library for FTPClient to upload and download images or files from FTP server?

Alina Dolgikh [JB]

10/20/2021, 3:40 PM

🆕 Hi everyone! We’ve recently created the #java-to-kotlin-refactoring channel. Join it for discussions of Java to Kotlin refactoring and to pose questions to the authors of a book on that topic 🙂

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asad.awadia

10/23/2021, 6:57 PM

If anyone is looking for a kotlin gRPC alternative https://github.com/asad-awadia/indie-rpc

EmmaG

10/24/2021, 5:42 PM

I need advice on how to go about it

David Smith

10/27/2021, 9:24 AM

does anyone know how to return no body to a micronaut declarative client, or rather how to expect no body?

Alina Grebenkina

10/28/2021, 3:28 PM

Kotlin for server-side content contribution Help us create posts, videos, or samples about migrating projects from Java to Kotlin with Spring or Ktor. By contributing, you’ll be working with us to move the community forward, and you’ll also have a chance to win Kotlin swag and get a free promo! More details

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Raymond Boswel

11/12/2021, 10:30 AM

Hi everyone, I've recently joined a team using Ktor and Hibernate and Maven (and the maven-shade-plugin). At present the project cannot hot reload, which is something I'm trying to address. I've migrated the project to Gradle, but can only get hibernate to work if I use the gradle Shadow plugin. Unfortunately this plugin seems to be incompatible with hot reloading, since it bundles all the dependencies in a single jar, preventing ktor from detecting updates. Without the Shadow plugin, I get the following when an entity is accessed:

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org.hibernate.hql.internal.ast.QuerySyntaxException: Account is not mapped

Does anyone have an example project or suggestion of how hibernate can be used with Ktor?

Bernhard

11/16/2021, 10:07 AM

Hi, I'm looking for a way to build a shell escaped string from a string array

antonarhipov

12/14/2021, 10:34 AM

I think it makes sense for this channel as well. This is an extremely interesting topic that will be covered in a webinar today!

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AlmPazel

12/15/2021, 3:54 AM

Object Detection and Image Recognition with Kotlin That we expected long time before, Great Job......

Jiří Hermann

12/16/2021, 3:01 PM

👋 I’m here! What’d I miss? 😄 Hi All 🙂

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Henrik Johansson

12/22/2021, 10:41 AM

I can't seem to get javax validations like this work:

List<@NotNull String>

a list with one null element is perfectly acceptable according to javax validations included with dropwizard

alon shoshani.86

12/29/2021, 9:49 AM

Hi all, We are using expose and working with postgres, I found that if I want to make more complex queries I need to write pure mysql. For example:

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INSERT INTO the_table (id, column_1, column_2) 
VALUES (1, 'A', 'X'), (2, 'B', 'Y'), (3, 'C', 'Z')
ON CONFLICT (id) DO UPDATE 
  SET column_1 = excluded.column_1, 
      column_2 = excluded.column_2;

what is the best solution to make such call? and how can be implemeted with prepared statement?

Greg Steckman

12/30/2021, 5:07 AM

I just uploaded a small "Hello, world" template project implementing an AWS lambda function that is compiled to native using graalvm. Maybe someone will find it helpful - https://github.com/gsteckman/Kotlin-graalvm-native-lambda-template

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Debanshu Datta

12/30/2021, 2:43 PM

Anyone has idea how to use Ktor for server-side-rendering of React App?

Agustin Magne

01/01/2022, 5:27 PM

Also I created a stackoverflow question for this

Agustin Magne

01/01/2022, 5:27 PM

https://stackoverflow.com/questions/70537024/jetbrains-exposed-sql-having-count

Johann Pardanaud

01/07/2022, 2:19 PM

Hi! I asked a question about coroutines in the #grpc channel but there are not many people in it, if anyone here has some knowledge about coroutines I would be grateful for your help. 🙏

Michael Evans

01/07/2022, 11:49 PM

Hello everyone! I'm new to kotlin and having some trouble running my Ktor server on heroku I'm setting up the server as follows:

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val port = System.getenv("PORT")?.toInt() ?: 9090
embeddedServer(Netty, port = port) {
    routing {
        get("/") {
            call.respondText(
                this::class.java.classLoader.getResource("index.html")!!.readText(),
                ContentType.Text.Html
            )
        }
        static("/static") {
            resources("")
        }
    }
}.start(wait = true)

When running on my localhost, this responds just fine. And when running in heroku, I get the log output that tells me it did start up the server on the port heroku defines:

[main] INFO ktor.application - Responding at <http://0.0.0.0:55278>

But then when I try to load the heroku app from the browser, I get an error, and the heroku logs say:

"Connection closed without response"

heroku[router]: at=error code=H13 desc="Connection closed without response" method=GET path="/" host=<http://melomidi.herokuapp.com|melomidi.herokuapp.com> request_id=e0cdaa83-eaa4-4733-a51f-947de463c433 fwd="174.246.82.169" dyno=web.1 connect=0ms service=13ms status=503 bytes=0 protocol=http

I have tried with both http and https. I have also tried loading static/index.html directly and got the same result. I've also tried adding a SERVER_HOST env var and using that to change the default 0.0.0.0 host to various things, like localhost, 127.0.0.1 and melomidi.herokuapp.com but those resulted in other errors where the server failed to start up. Anyone have any suggestions? Thanks in advance!

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Michael Evans

01/08/2022, 12:03 AM

Also posted the above question to stack overflow if anyone wants to get some points: https://stackoverflow.com/questions/70628480/kotlinjs-ktor-server-connection-closed-without-response-when-deployed-to-herok

Michael Evans

01/08/2022, 12:50 AM

^^^ found my answer: https://youtrack.jetbrains.com/issue/KTOR-3358 There was a binary compatibility issue between my ktor version 1.6.5 and JDK 1.8 I updated my JVM target to 11 and updated my heroku dyno to the same JDK 11 and now we're up and running :)

rubber duck 1

Exerosis

01/08/2022, 8:01 PM

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

So I've got this code, forEach in theory has 11 elements to loop. The 5th element cancels.

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Exerosis

01/08/2022, 8:02 PM

But if I call this method a second time (or any number of times past the first) it works perfectly.

Exerosis

01/08/2022, 8:03 PM

Is there some way I can turn off all compiler optimizations or something? it's the only thing I can think of that could cause this.

leomayleomay

01/09/2022, 8:27 PM

I’ve got following snippet working in kotlin playground https://gist.github.com/leomayleomay/89dd169b067d37a2f26a0282befac95c

leomayleomay

01/09/2022, 8:27 PM

While in my local dev env, it says

leomayleomay

01/09/2022, 8:27 PM

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kotlin.NotImplementedError: An operation is not implemented: Missing impl for Vehicle by impl