Caused by: org.xml.sax.SAXNotRecognizedException: unrecognized feature http://xml.org/sax/features/external-general-entities

image.png

I’ve been stuck on this issue for a long time. It uses IntelliJ’s own Ktor Wizard. The error message says that a feature of XML is missing, but I don’t know how to fix it.

👋🏻 Free hosting question, or lack thereof I am working with @Piotr Krzemiński on the #github-workflows-kt open source project, that wants to free the world to have to write YAML for their GitHub Actions. We have a YAML to Kotlin converter that works fine locally. But we are stuck because we would like to host it as a JVM server, and all free hosting plans are gone thanks to all those crypto scammers. For an open source project it’s annoying to have to pay every month for one little converter like that. Can you think of a work-around? like having a nice sponsor, gaining startup credits somewhere or something like that

Hi, I'm trying to play around with context receivers to restrict where methods can be called from? Example: I have a UserRepository that can create users, but I only want to be able to call that from the UserService

data class User(val name: String)

interface UserRepository {
	context(UserService.Context)
	fun createUser(): User
}

class RealUserRepository : UserRepository {
	context(UserService.Context)
	override fun createUser() = User("random-string")
}

interface UserService {
    class Context private constructor()
    companion object {
        private val context: Context = Context() // How do I create here?
    }

    //extension function so it's "protected"
	fun <T> UserService.withContext(block: context(Context) () -> T): T = with(context) {
        block(this)
    }

    fun createUser(): User
}

class RealUserService : UserService {
	val userRepository: UserRepository = RealUserRepository()

	override fun createUser() = withContext {
		userRepository.createUser()
	}
}

Everything works except the initialization of the Context. 1. Is there another way to accomplish this without context receivers? 2. How do I properly initialize the companion object prop?

set the channel topic: Web Backends, Kotlin interop with Java web frameworks, DSLs and anything running on a server

Hi, I'm trying to set expiration date on field in my database with kmongo-coroutine driver. My goal is when date is expired whole entry should be removed rom mongo db. But idk how to make it work.

override suspend fun setTokenInvalid(refreshToken: String):Boolean {
    collection.createIndex(RefreshToken::refreshToken, IndexOptions().expireAfter(7, TimeUnit.DAYS))

}

Hello everyone! I hope this is the right channel for this question. My team and I are currently looking to replace our framework for open API / swagger schema generation and possibly more broadly our REST framework entirely. We are currently using http4k for both purposes and have been using it for years. However, we have had quite some issues with it and specifically we have realized that it might be difficult or even impossible for us to meet new demands on our swagger schema generation with http4k. A part from http4k we are aware of spring/spring-boot which we'd preferably avoid. We have also investigated using ktor but it also seems insuficcient. This leads me to my questions: What frameworks do people here use for HTTP/Rest? If and how are you handling swagger/openapi schema generation? What benefits/problems do you see with your current setups?

Is it possible, and if so how, do I use the new K2 compiler with kotlin 1.8.20 when using Maven?

Hi, I'm trying to contaminate my team with Kotlin. Our server architecture is currently using node.js (js/ts) on AWS lambda (serverless, through API gateway) and mongodb as main storage. Since AWS released kotlin SDK I think now it would be a good time to propose some experiment and see if we can start writing some new stuff (at first) in kotlin and eventually adopt it everywhere. I'm looking for people who use Kotlin on a serverless architecture to share their setup and tips to get started. Thanks!

Hey guys, I have no experience with kotlin or java for web backends and I want to create one for my next KMM project. I’ve heard of “spring” and “apollo” are frameworks that could help and also ktor. But I don’t know what I’m doing and I could use some help getting started. I’ve done a bit with laravel php and node js in the past and that’s it for web backend programming but it’s something I’d really like to learn with kotlin.

Hello! How do you make type safe requests with Ktor on both the secret and the client? Do you simply put the content negotiation and resources classes in a shared module and call it good enough?

Hello everyone, I am well versed in Android development. Now I want to get started with server side development. Which framework should I pick up. There are lots... Spring, ktor, node.js etc? How do I proceed like first what should I do and then which next steps should I follow in order to get started with the backend. Thanks in advance.

Hello everyone, i am new to ktor and would like to get help about this code:

post("api/auth/endpoint") {

// start - block of code that is repeated
  val principal = call.principal<JWTPrincipal>()
        val userId = principal?.getClaim("userId", String::class)
        if (userId == null) {
            call.respond(
                HttpStatusCode.Forbidden,
                CyrCloError(401, "User not authenticated. Please login in again")
            )
            return@post
        }
// end
}


how can this code refactored? because i have been keep repeating that code to my other endpoints

Thanks,

Does anyone here use the ktor CIO engine on both client and server side? I don't see it being used that much but I am interested in it

Hi , I need some help with the initial ktor setup, I created a project from Intellij templates which gave me an initial application code:

fun main() {
    embeddedServer(Netty, port = 8080, host = "127.0.0.1", module = Application::module)
        .start(wait = true)
}

fun Application.module() {
    configureSecurity()
    configureHTTP()
    configureMonitoring()
    configureSerialization()
    configureDatabases()
    configureRouting()
}

and running staus is [DefaultDispatcher-worker-1] INFO ktor.application - Responding at http://127.0.0.1:8080, same when host is "0.0.0.0" but when i redirect to http://127.0.0.1:8080 on my browser. I get an error stating "Safari cannot open the page". how can I fix this?

Hey, the recording of my KotlinConf talk « Scale to Zero with Spring + GraalVM or WebAssembly » is now available, enjoy! https://twitter.com/sdeleuze/status/1652198783395016704?s=46&t=gaWml2DU4JAH0RI7bnbHzQ

is there a reference for how much of kotlin.reflect can be used without including the reflection dependency on JVM

e.g.

kotlin.reflect.KClass

seems to resolve without it

Hello all. About a year and a half ago I built a pure Kotlin SQL DSL (not an ORM) with a focus on supporting some complex SQL not supported by Exposed or Ktorm. This includes things like windows, CTEs, values relations and so on. I also tried to address design and quality-of-life issues in Exposed's SQL layer. This includes reliance on thread local state, awkward support for custom columns, mutable DSL elements and inconsistent casing of identifiers. The library has been used in production by myself and at least one other company for about a year without headaches. Anyone who is interested in this niche can find the project here: https://github.com/mfwgenerics/koala We also have a Slack channel #koalaql. I'd love to support any new users or contributors to the project

I occasionally get this error when trying to run scratch files:

Back-end (JVM) Internal error: Failed to generate expression: KtCallExpression
File being compiled: (11,37) in /tmp.kt
The root cause java.lang.IllegalStateException was thrown at: org.jetbrains.kotlin.codegen.state.KotlinTypeMapper$Companion.getPackageMemberContainingClassesInfo(KotlinTypeMapper.kt:1378)

and restarts and such don't seem to help

Hello... I have an issue with extracting objects from serverRequests... i used Spring Documentation in for kotlin,

https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-fn-request

but I'm getting internal server error

{
  "timestamp": "2023-05-04T18:31:46.979+00:00",
  "path": "/directory",
  "status": 500,
  "error": "Internal Server Error",
  "requestId": "de9e7a88-1"
}

I keep getting this message in the console

2023-05-04T21:31:46.981+03:00 ERROR 47367 --- [or-http-epoll-2] a.w.r.e.AbstractErrorWebExceptionHandler : [de9e7a88-1]  500 Server Error for HTTP GET "/directory"

java.util.NoSuchElementException: No value received via onNext for awaitSingle
    at kotlinx.coroutines.reactive.AwaitKt$awaitOne$2$1.onComplete(Await.kt:282) ~[kotlinx-coroutines-reactive-1.6.4.jar:na]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    *__checkpoint ⇢ HTTP GET "/directory" [ExceptionHandlingWebHandler]
Original Stack Trace:
        at kotlinx.coroutines.reactive.AwaitKt$awaitOne$2$1.onComplete(Await.kt:282) ~[kotlinx-coroutines-reactive-1.6.4.jar:na]
        at reactor.core.publisher.StrictSubscriber.onComplete(StrictSubscriber.java:123) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onComplete(FluxContextWrite.java:126) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.MonoNext$NextSubscriber.onComplete(MonoNext.java:102) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.5.5.jar:3.5.5]
        at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:413) ~[reactor-netty-core-1.1.6.jar:1.1.6]
        at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:431) ~[reactor-netty-core-1.1.6.jar:1.1.6]
        at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:663) ~[reactor-netty-http-1.1.6.jar:1.1.6]
        at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:113) ~[reactor-netty-core-1.1.6.jar:1.1.6]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:274) ~[reactor-netty-http-1.1.6.jar:1.1.6]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346) ~[netty-codec-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:333) ~[netty-codec-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:454) ~[netty-codec-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290) ~[netty-codec-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:800) ~[netty-transport-classes-epoll-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:499) ~[netty-transport-classes-epoll-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:397) ~[netty-transport-classes-epoll-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.91.Final.jar:4.1.91.Final]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.91.Final.jar:4.1.91.Final]
        at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

2023-05-04T21:31:47.026+03:00  WARN 47367 --- [or-http-epoll-2] r.n.http.server.HttpServerOperations     : [de9e7a88-1, L:/127.0.0.1:8080 - R:/127.0.0.1:42906] Decoding failed: FULL_REQUEST(decodeResult: failure(java.lang.IllegalArgumentException: text is empty (possibly HTTP/0.9)), version: HTTP/1.0, content: UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 0, cap: 0))
GET /bad-request HTTP/1.0

I tried this one as well

request._bodyToMono_<SearchDirectoryDto>().awaitFirstOrNull()

but the result was null...

I am receiving an html document as a http response. Is there a way (using ktor or kotlinx html) to parse that response into a document and then extract _csrf from it? I am already using Jsoup for that. but, I want to know if there is another way using kotlinx html or ktor client

how to use ktorm

exists

? it seems like it’s not an extension of Database or anything really but takes a query as an arg and returns an expression which implies it’s got to be a subquery. from what i can tell, we end up w the awkward double speak of

exists(
                database.from(MyTable).select()
                    .where(MyTable.featureFlagId eq ALLOW_LEVEL_BIDDING)
            ).notExists

which leads me to wonder how the non extension function interacts w the extension function esp if one or both are `not`…

Besides Kotlin on Spring(Boot) and Kotlin or Ktor, is there other places we see Kotlin used with a traditional web framework? (I find http4k a little too low level to count as a web framework)

River-kt 0.0.1-alpha04 was just released! Glad to announce this fresh release, with several enhancements and new features that hopefully will improve your development experience: - HTTP Connector Release: The HTTP connector is now available! You can construct and send HTTP requests using HTTP request extensions. Here's a quick example:

val pageNumberFlow = unboundedLongFlow(startsAt = 1)

val responseFlow: HttpResponse<String> =
	pageNumberFlow
	    .map { page ->
	        get("<https://example.com>") {
	            query("page", "$page")
	        }
	    }
	    .sendAndHandle(bodyHandler = ofString, parallelism = 10)
	    .takeWhile { it.body() == "[]" }

With this, you can create a pagination flow with a parallelism factor of 10. All responses will be emitted sequentially, stopping the pagination once the first empty list arrives. You may refer to the kdocs for more information. - New Connector in Development #1 - Google Drive: The early version of the Google Drive connector is now available, probably with potential bugs (I have warned!). Initial implementation includes two APIs:

val serviceAccount: JsonNode = // provide your credentials here  

val googleDriveApi = GoogleDriveApi(serviceAccount)

val files: Flow<GoogleDriveFile> = 
	googleDriveApi
		.listFiles {
		    driveId = "x"
		}

val fileContent: Flow<ByteArray> = 
	googleDriveApi.download(files.first().id)

- New Connector in Development #2 - GitHub API: I have kick-started the development of a GitHub API connector. The goal here is to enable the manipulation of an entire codebase using Kotlin flows. - New Connector in Development #3 - OpenAI API: All the kids are trying it nowadays, so, why not? While still in its early stages and likely to have bugs, I imagine multiple possibilities such as streaming large amounts of data for model training and building documentation using data from other connectors. - JSON Connector Fixes: Some issues were fixed in the JSON connector where non-trimmed string data was parsed incorrectly. Also, we've refined the function names for better readability and conciseness. Not necessarily related to the version release, but: - Added the first examples: Practical examples showcasing the capabilities of River-kt were added. Currently, we have three examples: JSON streaming (using Ktor as the HTTP server), downloading an CSV file from S3, parsing it, and saving each line to a PostgreSQL database via JDBC, and listening to an SQS queue and forwarding the requests to an HTTP API. More examples are in the oven. - Issues for future development: I have filled the repository with issues to map the future development of other connectors. This will not only help us gather community feedback on the most requested connectors but also provide visibility into ongoing development. Stay tuned for more updates, and thank you for your support!

Whats the best XML library to work with for Kotlin?

I don't know if Ktor maintainers saw my library but there is a powerful library in your hands that can be extended to more scenarios than Client and Server 😄 https://github.com/programadorthi/kotlin-routing

Hello everyone! I’m trying to setup oauth-based authorization with Discord on my Ktor app following the tutorial: https://ktor.io/docs/oauth.html Everything is working fine except for one case. If user rejects authorization request by pressing cancel (see screenshot), Discord server sends response on my callback endpoint with access_denied query parameter, like this:

/callback?error=access_denied&error_description=...

And since my

/callback

endpoint under

authenticate

block Ktor server behaves incorrectly - essentially it runs authorization flow again (since there is no authenticated OAuth2 proncipal, user redirects back to discord authorization window). Expected behaviour: let me handle this error and show to the user. Any advices how to tackle this problem?

Hi everyone! I have a Spring Boot project with Kotlin, and I’m using the Redis OM Library (https://github.com/redis/redis-om-spring). I’m trying to do a query with Entity Streams (https://github.com/redis/redis-om-spring#-querying-with-entity-streams) but I have to configure the annotation processor (https://github.com/redis/redis-om-spring#-maven-configuration). I did that with kapt

<plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>${kotlin.version}</version>
                <extensions>true</extensions>
                <executions>
                    <execution>
                        <id>kapt</id>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>src/main/kotlin</sourceDir>
                            </sourceDirs>
                            <annotationProcessorPaths>
                                <annotationProcessorPath>
                                    <groupId><http://com.redis.om|com.redis.om></groupId>
                                    <artifactId>redis-om-spring</artifactId>
                                    <version>0.8.0</version>
                                </annotationProcessorPath>
                            </annotationProcessorPaths>
                        </configuration>
                    </execution>
                </executions>
                <configuration>
                    <args>
                        <arg>-Xjsr305=strict</arg>
                    </args>
                    <compilerPlugins>
                        <plugin>spring</plugin>
                    </compilerPlugins>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.jetbrains.kotlin</groupId>
                        <artifactId>kotlin-maven-allopen</artifactId>
                        <version>${kotlin.version}</version>
                    </dependency>
                </dependencies>
            </plugin>

But I’m getting this error:

exception java.lang.NoSuchFieldException is never thrown in body of corresponding try statement

And this is the generated class

public final class UserInfoHash$ {
  public static MetamodelField<UserInfoHash, String> _KEY;

  static {
    try {
      _KEY = new MetamodelField<UserInfoHash, String>("__key", String.class, true);
    } catch(NoSuchFieldException | SecurityException e) {
      System.err.println(e.getMessage());
    }
  }
}

Can someone help me with this please?