kotlinlang #server

Hello everyone, Hexagon 1.0 got released!!! It is a toolkit for developing web services in Kotlin heavily inspired in Javalin and Spark. I would like to gather feedback from the community, so if you could take a look at it, share your thoughts, spread the word among other Kotlin developers and/or give it a star 😉 It would be much appreciated 🙂 https://hexagonkt.com https://github.com/hexagonkt

👍 2

👋 5

12 replies · 4 participants

Maksim Vlasov

06/06/2019, 9:12 AM

I get the following error when I package a composite project with maven:

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.0.5.RELEASE:repackage (default) on project pkt-event-manager: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:2.0.5.RELEASE:repackage failed: Unable to find main class -> [Help 1]

2 replies · 2 participants

tipsy

06/06/2019, 6:01 PM

#ktor

1 reply · 2 participants

oday

06/07/2019, 8:00 AM

http://snpy.in/Jh28gi

16 replies · 4 participants

oday

06/07/2019, 11:19 AM

is this not correct for fetching ktor? http://snpy.in/FcvTCS

3 replies · 1 participant

Ryan

06/13/2019, 2:08 AM

Hey everyone 👋 I was wondering if anyone here has experience implementing a GraphQL API in Kotlin! I’d love to talk to you and hear about your experience! Did it go well? What tools did you use? Would you do it again? and more! Feel free to reply in thread or DM 🙂

6 replies · 5 participants

Horv

06/13/2019, 7:05 AM

Hello! I'm going to start a new hobby code project to learn Kotlin further. It will be frontend client apps (Android, iOS) and backend service. I'm a bit split on which framework to pickbfor backend. Any recommendations between Ktor and Javalin?

+10

14 replies · 13 participants

Alexander Weickmann

06/26/2019, 9:09 AM

Hey all. How to integrate SAML SSO with ktor? I found this library (https://github.com/onelogin/java-saml), but it uses javax.servlet.HttpServletRequest and javax.servlet.HttpServletResponse. Therefore, I cannot pass it the io.ktor.application.ApplicationRequest / io.ktor.application.ApplicationResponse ...

2 replies · 2 participants

Akram

07/04/2019, 3:08 PM

hello i'm starting up with ktor , and want to implement my own oauth2 provider can i do it with ktor ?

3 replies · 3 participants

Talha Malik

07/08/2019, 10:23 PM

I'm trying to build #ktor locally on my mac and I'm running into issues. Specifically the

macos64x

task is failing. Are there any docs for people that are trying to contribute?

1 reply · 2 participants

Jonathan Chen

07/17/2019, 12:40 AM

Hey how is the adoption of Kotlin for serverside going? I’m looking to get back into the Java world and am deciding if its worth it for me to invest time into Kotlin as well.

15 replies · 7 participants

Sergio Casero

07/17/2019, 8:43 AM

Hello guys!, I'm getting this issue when I try to deploy a war (using ktor):

java.lang.NoClassDefFoundError: javax/servlet/ReadListener

. But the dependency

'javax.servlet:javax.servlet-api:3.0.1'

is already included Any ideas? If I try to run the app with

application

plugin works perfect. I'll put my build.gradle file in a thread.

3 replies · 2 participants

Rodrigo Silva

07/19/2019, 6:53 PM

Hello everyone. Has anyone used yavi with Ktor?

2 replies · 2 participants

jwd83

07/21/2019, 2:55 PM

Have just been getting started with Kotlin and wanted to make a basic http app on a remote VM via the Linux the command line. I'm not intimately familiar with Kotlin nor Java and have been working on getting kotlinc to build my app.

kotlinc http.kt -include-runtime -d http.jar -cp ../libs/*.jar

throws an error

error: source entry is not a Kotlin file: ../libs/javalin-3.2.0.jar

I'm realizing I'm probably going about this the complete wrong way but I've found the official documentation on command line compilation a bit thin. I just started with Javalin but am willing to swap to anything else that can get a little REST service up and running quickly.

10 replies · 3 participants

coder82

07/26/2019, 9:40 AM

Hi guys, I am building an API using Kotlin and KTOR. I have to connect to a legacy system which offers only blocking calls, so I guess even if I use the coroutines, ultimately a thread from the pool will be blocked on these calls right? I can't do otherwise. So if I use for example "withContext", and use a specific context with a pool of 20 threads, i can never serve more than 20 calls in parallel right? Ultimately want I want to do is to respond with some sort of backpressure message when these 20 threads are all busy. What do you reckon? the legacy system doesn't offer asynchronouse callbacks so i cannot build something with suspendCoroutine around it so I am kind of forced to pool threads it's be nice to have somebody's opinion on it

8 replies · 4 participants

Mani

07/26/2019, 7:53 PM

Hi guys, a naive doubt, please bear with me. Any good example with gzipping API responses in Kotlin?

8 replies · 5 participants

pyrkamarcin

07/27/2019, 11:35 AM

Hi Guys! Can you advice some good method to reduce this spaghetti:

val confirmAccountDeletionEmailStatement = configurationConnection().prepareStatement("SELECT t.id,t.name,t.subject,t.content FROM email_templates t WHERE name='confirm_account_deletion'")

                val confirmAccountDeletionEmailResultSet = confirmAccountDeletionEmailStatement.executeQuery()
                var confirmAccountDeletionEmailId = 0
                var confirmAccountDeletionEmailName = ""
                var confirmAccountDeletionEmailSubject = ""
                var confirmAccountDeletionEmailContent = ""
                while (confirmAccountDeletionEmailResultSet.next()) {
                    confirmAccountDeletionEmailId = confirmAccountDeletionEmailResultSet.getInt(1)
                    confirmAccountDeletionEmailName = confirmAccountDeletionEmailResultSet.getString(2)
                    confirmAccountDeletionEmailSubject = confirmAccountDeletionEmailResultSet.getString(3)
                    confirmAccountDeletionEmailContent = confirmAccountDeletionEmailResultSet.getString(4)
                }

5 replies · 5 participants

Tauhid Rehman

07/29/2019, 6:48 PM

if (addPaymentRequest.additionalAmount <= 0) {
            throw BorrowerServicingException("Loan amount must be greater than 0", EC_INVALID_LOAN_AMOUNT)
        }

3 replies · 2 participants

Sandeep Gurram

07/30/2019, 8:48 AM

Hi all, am an android developer. I want to start learning server side programming, can any one suggest me where can i start ? I know nothing about server side programming.

1 reply · 2 participants

Guru

07/30/2019, 3:15 PM

Guys I am having an issue - http://qaru.site/questions/18042490/whats-wrong-with-coroutine-context

8 replies · 2 participants

Nidhin

07/31/2019, 7:40 AM

I’m trying to mock Spring mongo repository save(object) using mockk as below every { repositoryBean.save(any())} return Object(id=“1234”, timesatmp= 123446767, name= “sam”) but this shows me an error Type inference failed i also tried every { repositoryBean.save(Object(id=null, timestamp=any(), name=“sam”)} return Object(id=“1234", timesatmp= 123446767, name= “sam”) this also failed throwing Failed matching mocking signature for …..left matchers: [any(), any()] I don’t know the timestamp, as it is created dynamically and hence I can’t provide strict arguments can someone help me?

1 reply · 2 participants

J. Pablo Fernández

08/02/2019, 1:41 PM

What web frameworks/libraries? Something Kotlin specific?

8 replies · 8 participants

J. Pablo Fernández

08/02/2019, 8:57 PM

In https://spring.io/guides/tutorials/spring-boot-kotlin/ it says that when creating the project we should add the web dependency, but I don't see that in spring boot initializr, is this referring to Spring Web Starter? https://start.spring.io/#!language=kotlin&type=gradle-project

1 reply · 2 participants

Tauhid Rehman

08/02/2019, 9:02 PM

hey you guys, need some help. want to use an existing function called

mask()

as an extension for a json property on the request itself. the property itself is called

bankAccountNumber

and the below code is the request class:

@NotNull(message = "'bank_account_number' must be provided")
    @JsonProperty("bank_account_number")
    var bankAccountNumber: String = ""

1 reply · 2 participants

Tauhid Rehman

08/02/2019, 10:16 PM

thansk David. Can you link me to any sample code?

1 reply · 2 participants

J. Pablo Fernández

08/06/2019, 1:37 PM

What's the situation with testing in a Kotlin + Spring Boot application? I'm tempted to use TestNG, any reasons not to? Should I use kotlin.test?

43 replies · 8 participants

Velastroll

08/13/2019, 12:15 PM

I tried with the same machine using 127.0.0.1 and it's working. I tried with different machines on the same network using the local ip (168.192.X.X) and it's working. I tried with different machines on different networks using the external ip (84.X.X.X) but doesn't work.

8 replies · 3 participants

Title

Velastroll

08/13/2019, 12:15 PM

Can Orhan

08/13/2019, 12:18 PM

84.x.x.x being your router address? Would it need to know which machine it should forward requests to?

Velastroll

08/13/2019, 12:21 PM

Yes, 84.X.X.X is my router address. So, have i got to configure the router to forward the request?

Can Orhan

08/13/2019, 12:23 PM

Based on my memory of setting up LAMP about 10 years ago - Yes. I think so 😄

Velastroll

08/13/2019, 1:10 PM

Ok, thank you. I'm going to try it.

Can Orhan

08/13/2019, 1:12 PM

Good luck!

molikuner

08/13/2019, 1:37 PM

You need a portforward

Or use IPv6, but that's most of the time not worth the effort and isn't as compatible or stable as IPv4.

BTW. Be aware, that most user grade internet connections reconnect once a day and get a new IP. That problem is fixable by using a DynDNS. Just search for it. You will get a domain name to connect to.

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