kotlinlang #getting-started

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getting-started

martyix

08/21/2017, 5:31 AM

Hi, I wrote the following line:

val command = """{"type":"Modify", "content":{"levels": { "$identifier": {"$propertyName":"$value"}}}}"""

This is obviously very bad code as any of the variables can easily break JSON. What would be "kotlin-way"? I'm looking for some concise solution. 🙂 Thanks PS: I use Kotlin 1.1.4

diesieben07

08/21/2017, 11:40 AM

If the varargs array itself is null, then that's an issue and it's ok if your code throws a NullPointerException, if you document that in the API.

karelpeeters

08/21/2017, 11:43 AM

You can also check if it's null when calling the method.

leonardootto

08/21/2017, 1:32 PM

I need change it to more clear. Do you have some good examples of property extension?

rsteiger

08/21/2017, 10:58 PM

So, I'd really appreciate a minimalist idiot's guide to how you'd create the ktor Getting Started project (the ktor docs assume you're an IJ Master Jedi :-).

rsteiger

08/21/2017, 11:00 PM

BTW, I'm faced with the same ignorance just trying to run through the koans ...

longthanhtran

08/22/2017, 12:13 PM

hi, I am starting with Kotlin and trying to find Sublime text 3 syntax highlight plugin for kotlin but seems there is yet one ?

Michael

08/22/2017, 2:39 PM

Hey folks! Trying to integrate kotlin in an existing maven project here. I did so just fine following the instructions on the website using maven/intellij - it’s building fine, and it’s running in the editor for me. But my teammates on eclipse aren’t having any luck (nor am I, if I fire it up in eclipse.) Added the Kotlin Plugin for Eclipse - but it seems that it’s not delegating to maven to actually run the compilation. Any suggestions?

karelpeeters

08/23/2017, 6:09 PM

@ilya.gorbunov?

mfiano

08/24/2017, 3:23 AM

Is Kotlin easy to learn with no Java or C-like language experience? Only language I know is Common Lisp.

tipsy

08/24/2017, 11:37 AM

what is usually used for random id's in kotlin? just

UUID.randomUUID()

kagomez

08/25/2017, 12:09 AM

hey guys a question; is there a best practice for a classs that has multiple constructors?

muralimohan962

08/26/2017, 8:25 AM

How to compile and run both java and kotlin files together from the command line?

baob

08/26/2017, 9:30 PM

I’m a total newb to kotlin, (and java too pretty much) but I find to get started I need to make a choice between maven and gradle. Based on reading this I’m thinking for a beginner, and small projects, that Maven might be good for me ? What do you think ? https://dzone.com/articles/maven-vs-gradle-and-the-best-of-both-worlds

baob

08/27/2017, 11:48 AM

I’ve been hacking away with attempts like

sourceSets.main.kotlin.srcDirs = ['src']

but even that doesn’t seem to do it

dancancro

08/27/2017, 6:27 PM

Hi everyone. I am brand new to Kotlin and having the following problem with my JHipster app in which I mix java and kotlin: https://github.com/dancancro/great-big-example-application/tree/blogwithkotlin/src/main/kotlin/org/exampleapps/greatbig

2017-08-27 14:12:33.623  WARN 62423 --- [  XNIO-2 task-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.VerifyError: Uninitialized object exists on backward branch 82
Exception Details:
  Location:
    org/exampleapps/greatbig/domain/inout/Article$Companion.fromModel(Lorg/exampleapps/greatbig/domain/Article;Lorg/exampleapps/greatbig/domain/Author;)Lorg/exampleapps/greatbig/domain/inout/Article; @129: goto
  Reason:
    Error exists in the bytecode
  Bytecode:
    0000000: 2b12 39b8 000f 2c12 3bb8 000f bb00 3d59
    0000010: 2bb6 0043 2bb6 0046 2bb6 0049 2bb6 004c
    0000020: 2bb6 0050 c000 524e 3a12 3a11 3a10 3a0f
    0000030: 3a0e 3a0d 2d3a 04bb 0054 592d 100a b800
    0000040: 5ab7 005e c000 603a 0519 04b9 0064 0100
    0000050: 3a06 1906 b900 6a01 0099 002b 1906 b900
    0000060: 6e01 003a 0719 0519 07c0 0070 3a08 3a13
    0000070: 1908 b600 733a 1419 1319 14b9 0077 0200
    0000080: 57a7 ffd1 1905 c000 793a 1319 0d19 0e19
    0000090: 0f19 1019 1119 1219 132a c000 022b b600
    00000a0: 7db6 007f 2ac0 0002 2bb6 0082 b600 7fb2
    00000b0: 0088 2bb6 008c 2cb6 0092 2bb6 0095 2cb9
    00000c0: 0098 0200 2bb6 0095 b900 9c01 003e 3604
    00000d0: 3a05 3a06 3a07 3a08 3a09 3a0a 3a0b 3a0c
    00000e0: 190b 190a 1909 1908 190c 1907 1906 1905
    00000f0: 1504 1db7 009f b0
  Stackmap Table:
    full_frame(@82,{Object[#2],Object[#63],Object[#176],Object[#82],Object[#82],Object[#96],Object[#102],Top,Top,Top,Top,Top,Top,Uninitialized[#12],Uninitialized[#12],Object[#178],Object[#178],Object[#178],Object[#178]},{})
    same_frame(@132)

d.medina

08/27/2017, 8:42 PM

object AppDataManager : DataManager by dataManager {
  private lateinit var dataManager: DataManager
  fun init(manager: DataManager) {
    dataManager = manager
  }

baob

08/27/2017, 10:17 PM

On the remote chance that anyone is trying to replicate the example ktor app (as a complete kotlin/java newb, as I was) then you’ll find the steps to doing that by following this branch in my repo. https://github.com/baob/sandbox-kotlin-ktor-hello/tree/gradle-hacked-from-ktor-readme-improved /cc @rocketraman @x80486

jtonic

08/28/2017, 4:37 AM

Dear Kotlin community, Is it possible to convert the following java annotations to kotlin? I tried to make it w/o any luck. I thought @JvmField would be of any help, but wasn’t.

public class Profiles {

  @Target(ElementType.TYPE)
  @Retention(RetentionPolicy.RUNTIME)
  @Profile(Service1MockedProfile.NAME)
  public @interface Service1MockedProfile {

    String NAME = “Service1MockedProfile”;
  }

  @Target(ElementType.TYPE)
  @Retention(RetentionPolicy.RUNTIME)
  @Profile(Service2MockedProfile.NAME)
  @interface Service2MockedProfile {

    String NAME = “Service2MockedProfile”;
  }
}

@Service
@Profiles.Service1MockedProfile
class MyService {}

@ActiveProfiles(profiles = {Service1MockedProfile.NAME})
class MyServiceTest {}

f.babic

08/28/2017, 11:57 AM

Hey guys, in case anyone here is just getting started with Kotlin (as the channel name suggests! 😄 ) I’ve got a mini series of articles about Kotlin that I’ve been writing in my spare time to spread the word around about the awesome language all of us use every day 🙂 So in case any of my current and future articles help you, it would mean a lot to me. https://medium.cobeisfresh.com/kotlin-fever-part-2-functions-and-expressions-f93dba724298 Also, any criticism, no matter if positive, negative, constructive, or just random is welcomed ❤️

👍 3

jtonic

08/28/2017, 6:17 PM

Hi, Is it possible to have a public static final field in kotlin annotation like we can have in java? I tried to use the @JvmField but w/o any luck. It works fine on object but it seems not to work in kotlin. Java code

@Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
 @Profile(Service1MockedProfile.NAME)
 public @interface Service1MockedProfile {

   String NAME = "Service1MockedProfile";
 }

During the migration from Java to Kotlin this is one of the remaining code that still struggling with.

karelpeeters

08/28/2017, 6:30 PM

Maybe file an issue about this?

agomez

08/29/2017, 4:47 PM

https://medium.com/100-free-udemy-coupons/the-total-kotlin-course-learn-kotlin-today-udemy-free-coupon-100-off-ea6e89c86575

Slackbot

08/29/2017, 8:30 PM

This message was deleted.

saurabha5

08/30/2017, 3:13 PM

What is the best way to Deal with HTTP calls on Android with Kotlin ? Do I really need to use an external library or something comes along with Kotlin ?

poohbar

08/30/2017, 3:14 PM

wait why would methods be in the variables list during debugging???

amichalski

08/30/2017, 3:38 PM

Are there any good dependency injection framework except Dagger 2 for Kotlin in Android?

halirutan

08/30/2017, 10:42 PM

Here is a beginners question. In java one sometimes uses

interface

to hold data-values

public interface SymbolNames {
  String BeginPackage = "BeginPackage";
  String EndPackage = "EndPackage";
  String End = "End";
}

What is the equivalent in Kotlin? When I convert the above to Kotlin it gives me an interface with a companion object. Is this the way to go?

techie01

08/31/2017, 7:47 AM

how to work with datetime in kotlin with java support

arekolek

08/31/2017, 9:55 AM

How come does

run

work with references that accept an argument, even though it’s defined as

T.run(block: T.() -> R): R = block()

Title

arekolek

08/31/2017, 9:55 AM

How come does

run

work with references that accept an argument, even though it’s defined as

T.run(block: T.() -> R): R = block()

ilya.gorbunov

08/31/2017, 4:15 PM

The functional types

(T) -> R

and

T.() -> R

are assignment compatible.

🙀 1

➕ 2

arekolek

08/31/2017, 4:22 PM

Thanks, any place where one can read more about that?

ilya.gorbunov

08/31/2017, 4:42 PM

Can't find anything about it. Probably the function types http://kotlinlang.org/docs/reference/lambdas.html#function-types section should be extended.

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