Hey everyone, I’m just looking for some advice on how to set up this project I’m working on. I need to stand up a server with an exposed API other applications can hit, with a front end gui that users can interact with. In addition to being able to deploy this as a server on VM, I need to be able to package the whole thing as a standalone application users can run locally on windows, linux, and osx when they don’t have access to the internet. I was thinking of using ktor as the back end and kotlin js for the front end, but I want to make sure I’m setting the project up correctly. If I use the default Kotlin ->

JS Client and JVM Server | Gradle

new project setup in IntelliJ, will this provide the project structure necessary for these requirements? Or is there a better starter project to use? Also, has anyone had experience doing this kind of dual purpose project? One that needs to be deployed as a stand-alone server with a front end, and also needs to be packaged as an application that can be run locally without internet? Any advice would be greatly appreciated. I think I have a good idea on where to start after reading though a bunch of the documentation, I just want to make sure I’m not missing anything.

has anyone seen/fixed this in thier travels?

Error: com.oracle.graal.pointsto.constraints.UnresolvedElementException: Discovered unresolved type during parsing: kotlin.KotlinPackage. To diagnose the issue you can use the --allow-incomplete-classpath option. The missing type is then reported at run time when it is accessed the first time.

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Hi, i'm doing an e commerce with the backend in spring and for recipes i'm returning mimeMessage emails but i'm building my htmls as strings dynamically, so it's a hard string process ... is there any library that you've used and recommend for doing this?

Hello devs! Any advice for a kotlin android developer who wants to get started with KTOR?

Hi Iam trying to use maven to compile my spring boot kotlin set up..

Try generating a pom or gradle file: https://start.spring.io/ there are kotlin options there.

Anyone familiar with the latest on lombok + kotlin? For reference, we have a very large java codebase with lombok littered all over and it makes introducing Kotlin very difficult since — as far as I can tell — in mixed java/kotlin source modules, there's no way to get the kotlin compiler to see the lombok generated code. I would love to be wrong about that though. Does anyone have experience with this or has found a smooth way around it?

Hi, how can you control the http responses? Example If it is a 400 or 500. Return a custom message

Hi, Someone knows a cache on spring framework for Kotlin reactive coroutines? I’m using suspended functions and it seems not to work with spring cache

Hi everyone, I hope I'm not asking in the wrong channel, but I just tried updating to Kotlin 1.4 in my Spring Boot project, but I'm seeing a

java.lang.NoClassDefFoundError: Could not initialize class kotlin.reflect.jvm.internal.impl.builtins.jvm.JavaToKotlinClassMap

. Without posting the full stacktrace, the problem arises from the

SpringApplication.run

method, so it's not some personal code that is running it. (I'm using Spring Boot 2.2.x for this)

Does anybody implemented REST api with partial responses in micronaut or kotlin ?

Hi guys please has anyone done sms verification witth springboot? I want to set up signing up a new user, so it needs to send an otp to the user phone number for verification

Hi all, I'm trying out Ktor for the first time and immediately running into issues. I'm just trying to follow the basis HTTP client setup. I used the Kotlin Intellij Plugin and everything builds fine but the second I try to make a get request I'm getting an error. The following code doesn't compile with line 16, but does without:

14 fun Application.module(testing: Boolean = false) {
15    val client = HttpClient(CIO)
16    val htmlContent = client.get<String>("<https://en.wikipedia.org/wiki/Main_Page>")
17 }

But I the the following error

Error:(16, 30) Kotlin: Unresolved reference. None of the following candidates is applicable because of receiver type mismatch:

public inline operator fun <K, V> Map<out String, [ERROR : Explicit type argument expected for V]>.get(key: String): [ERROR : Explicit type argument expected for V]? defined in kotlin.collections

public operator fun MatchGroupCollection.get(name: String): MatchGroup? defined in kotlin.text

[Ktor] Is it possible to configure ktor/netty to support http/2 cleartext (h2c)?

Does anybody know a good lib for socket with kotlin?

Hi, I have a problem with spring boot 2.1.6 I tried to use kotlin bean dsl to declare beans and it works perfectly fine for the core app, but tests are failing (for tests I am using spring-boot-starter-test and kotest). I have read all the information I could find on stackoverflow and made these improvements: 1. Created

class BeansInitializer : ApplicationContextInitializer<GenericApplicationContext> {
   override fun initialize(context: GenericApplicationContext) {
       beans().initialize(context)
   }
}

2. Set context.initializer.classes=com.package.BeansInitializer in application.properties It helped a little bit, now some of the beans are created, but all beans with @ConfigurationsProperties are still not created.

I spent a bit of time figuring out how to do a security filter with Kotlin, Spring Boot, and Flux: https://dev.to/jillesvangurp/reactive-security-filter-with-spring-kotlin-1ajo

hey Kotlin server folks! i'm working with Ktor + Exposed to manipulate a database, and i've come across a dilemma related to architecture. with Exposed, it seems that the way Entities are designed is that they are not really meant to be transformed to domain models unless you transform all the relationships at once. for example, we have a few properties that are referenced via another table using

referencedOn

. These are properties that are fetched lazily.

object ClassEquipments : IntIdTable("class_equipments") {
  val equipmentId = integer("equipment_id").entityId().references(Equipments.id)
  val classId = integer("class_id").entityId().references(Classes.id)
  val createdAt = timestamp("created_at").default(Instant.now())
  val updatedAt = timestamp("updated_at").default(Instant.now())

  init {
    index("ce_class_id_equipment_id", true, classId, equipmentId)
  }
}

class ClassEquipmentEntity(id: EntityID<Int>) : IntEntity(id) {
  companion object : IntEntityClass<ClassEquipmentEntity>(ClassEquipments)

  var equipmentId by ClassEquipments.equipmentId
  var classId by ClassEquipments.classId
  val createdAt by ClassRatings.createdAt
  var updatedAt by ClassRatings.updatedAt
  val equipment by EquipmentEntity referencedOn Equipments.id
  val clazz by ClassEntity referencedOn Classes.id
}

Our transformation extension looks like this

fun ClassEquipmentEntity.toModel(): ClassEquipment = ClassEquipment(
    id = id.value,
    equipmentId = equipmentId.value,
    classId = classId.value,
    clazz = clazz.toModel(),
    equipment = equipment.toModel(),
    updatedAt = updatedAt.offsetDateTime,
    createdAt = createdAt.offsetDateTime
)

We convert everything at once. If we always wanted a

clazz

and an

equipment

this would be fine. There are times, however, that we don't want these objects. Now, this could be a question of premature optimization, but I'm wondering if anyone has been able to have a nice data class representation of a domain model that also allows the flexibility to load relationships on demand? Or maybe this approach is flawed somehow? Really curious to hear from anyone familiar with this. Thanks in advance!

Kotlin wizards let me hear ya. I'm using dropwizard and I was wondering if it's possible to convert Jersey's

AsyncResponse

to a suspend function (supporting resource

suspend

functions transparently). Existing:

class SomeResource {
  @GET
  fun someMethod(@Suspended asyncResponse: AsyncResponse) { ... }
}

Desired:

class SomeResource {
  @GET
  suspend fun someMethod() { ... }
}

Hey! I became pretty enraged with ktor this week. More specifically content negation with Gson. I think the mention of Gson should be removed entirely from the docs, or at the very least get a big fat warning label. Gson does not respect null safety in Kotlin. If an incoming JSON object is missing fields, Gson will not throw an error, but rather populate the field in the corresponding data class with null. Apparently is been like this for a long time, and I don’t think the gson team plans on addressing this..

just updated to kotliin 1.4. and when using

?:

for a nullable list I get this... (see screenshot). Known issue?

Hi guys I'm having issues with the mapstruct mapper in springboot

@Mapper
@Component
interface UserMapper {
    fun toUserDTO(user: User): UserDTO
    fun toListOfUserDTO(users: List<User>) : List<UserDTO>
    fun toUser(userDTO: UserDTO) : User
    fun toListOfUser(userDTOs: List<UserDTO>) : List<User>
}

and i'm using it in my contoller

@Autowired
lateinit var userMapper: UserMapper

It gives this error, please help

***************************

APPLICATION FAILED TO START *************************** Description: Field userMapper in com.scienta.backend_rated_ng.controller.AuthController required a bean of type 'com.scienta.backend_rated_ng.mapper.UserMapper' that could not be found. The injection point has the following annotations: - @org.springframework.beans.factory.annotation.Autowired(required=true) Action: Consider defining a bean of type 'com.scienta.backend_rated_ng.mapper.UserMapper' in your configuration.

is anyone out there using the jdk9+ java.net.http.HttpClient with sendAsync in combination with CompletionStage<T>.await() to make it suspendable? https://www.javaspecialists.eu/archive/Issue271.html got me thinking on the scalability of this solution… parts of the http requests are now executed on the common forkjoinpool threads and parts of it are awaited by coroutine executors.. 🤔

Idiomatic kotlin preconditions for spring boot Restful API's I would love your feedback on this. If you could contribute any ideas by creating issues and providing constructive feedback, it would be immensely helpful. https://github.com/nextbss/requirekt

Hi, I'm newbie trying to use KMP to build a full stack web app using Ktor in jvmMain as back-end and Kotlin-React in jsMain as front-end, How can I add all jsMain source set to ktor watch path to enable automatic reload .

fun main() {
    embeddedServer(
        Netty, watchPaths = listOf("jvmMain"), port = 8080,
        module = Application::myModule
    ).start(wait = true)
}

fun Application.myModule() {
    routing {
        get("/") {
            call.respondHtml(HttpStatusCode.OK, HTML::index)
        }
        static("/static") {
            resources()
        }
    }
}

Hey does anyone know a good AMQP library that works well with coroutines?

And what would you guys recommend for job scheduling (I am using ktor for the main application) but have a bunch of tasks that need to be executed in certain intervals

I'm curious if people here are using Jooby. Got nice techempower scores (fwiw) and seems to have good Kotlin support (although I haven't seen a Jooby room in this slack)