🎯 Kotlin Roadmap got updated

Changes since October 2020
Now you can also view it as an agile board.

Main highlights:
✉️ Sealed interfaces, JVM records, @JvmInline value classes: Beta in 1.4.30
🔄 The new Kotlin compiler is bootstrapped
☕️ New JVM Backend: Beta in 1.4.30, default in 1.5
🥇 Improvements to IDE experience
🐞 Polishing debugging experience: IDE, Multiplatform
⚙️ Binary backward compatibility (experimental) for Kotlin/Native since 1.4
🎓 Learning materials: new KMM app sample
📚 kotlinlang.org: mobile version, updated visuals for site and docs

Kudos to Egor Tolstoy for comprehensive Twitter thread on the updates!

Say Hello to Ktor Early Access Program and New Plugin

- Nightly Ktor Builds
- New Ktor IDEA Plugin

😱 Into the Sunset on May 1st: Bintray, JCenter, GoCenter, and ChartCenter

jcenter() will stop working on May 1, 2021!

If you are a library author, you may be interested in this links:

- repo.kotlin.link - Single repo-proxy for multiple projects
- I wrote article on how to use S3 repo as maven repository
- please submit free/paid maven repository solutions here

📦 Kotlin 1.4.30

✅ JVM IR backend in Beta
✅ Inline value classes in Beta
✅ Experimental JVM records support
✅ Sealed interfaces preview

What's new in Kotlin 1.4.30 (old doc link)
Changelog

📼 Роман Елизаров — Интервью и Q&A: Эволюция Java и Kotlin. Что нас ждет?
📼 Семен Огородник — Kotlin Compiler в прошлом, 1.4 и не только

Blogposts about Kotlin 1.4.30 Release:

- 1.4.30 Is Released With a New JVM Backend and Language and Multiplatform Features
- New Language Features Preview in Kotlin 1.4.30
- The New JVM IR Backend Is in Beta: Let’s Make It Stable Together

Try it: JVM IR Backend

In gradle:

compileKotlin {
    kotlinOptions.useIR = true
}

// Kotlin DSL
val compileKotlin: KotlinCompile by tasks
compileKotlin.kotlinOptions.useIR = true

In maven:

<configuration>
  <args>
  <arg>-Xuse-ir</arg>
 </args>
</configuration>

How to check that code compilled with IR:

> Take a look at the value of xi in the @Metadata annotation on any compiled class file. With 1.4.30, if it's 48 or 50, it means it's compiled with JVM IR. :) More details

Submit (search first!) issues in Youtrack or #jvm-ir-backend-feedback slack channel

Qodana EAP - Best static analysis CI tool for Kotlin?

Early Access Program for Qodana, a New Product That Brings the “Smarts” of JetBrains IDEs Into Your CI Pipeline

First recordings from FOSDEM 2021 are available:

1. And that, folks, is how we shared code between Android, iOS and the Backend
2. Live coding server as a function with http4k
3. Come to the backend side we have Kotlin! Ktor for backend development
4. Migrating from Imperative to Reactive then Coroutines a Spring Boot application

Kotlin is still growing on Stack Overflow Trends

📦 kotlinx.serialization 1.1.0

- Kotlin 1.4.30
- Experimental support for inline classes (IR only)

Changelog 1.1.0
Changelog 1.1.0-RC

Article about Lincheck: How We Test Concurrent Primitives in Kotlin Coroutines

📦 Kotlin 1.4.31 Released
Changelog

📦 Ktor 1.5.2 Released
Changelog

TalkingKotlin is now on the Kotlin YouTube channel!

First episode in new format: Catching Up With Roman Elizarov

📦 Kotlin 1.5.0-M1

✅ Inline value classes, sealed interfaces and JVM records
✅ JVM IR backend by default
💪 Huge list of compiler fixes
🤔 Deprecate JVM target version 1.6

Changelog

📦 kotlinx.coroutines 1.4.3 and 1.4.3-native-mt

- CoroutineStart.UNDISPATCHED promoted to stable API
- Better support of ThreadContextElement and its integrations
- Proper support of onUndeliveredElement in unlimited channels
- Various performance improvements and bug fixes

Changelog

Recordings from FOSDEM 2021 are available:

1. Nicola Corti, Martin Bonnin – Kotlin DevRoom Welcoming Remarks
2. Svetlana Isakova – Kotlin Roadmap: Upcoming Features
3. LouisCAD – The future of dependency management, seen from 2021
4. Dmitry Kandalov – Live coding server as a function with http4k
5. Julien Salvi – Come to the backend side we have Kotlin!Ktor for backend development
6. Nishant Srivastava – Step it up: Compose for Desktop
7. Monika Kumar Jethani – Goodbye Kotlin Extensions, Welcome View Binding
8. Mikolaj Leszczynski, Matthew Dolan – How to write your own MVI library and why you shouldn't
9. Marco Gomiero – And that, folks, is how we shared code between Android, iOS and the Backend
10. Russell Wolf – Lessons I’ve learned in Multiplatform Library Development
11. Nicolas Frankel – Migrating from Imperative to Reactive then Coroutines a Spring Boot application
12. Holger Steinhauer – This Spring Shall Be Challenged. It doesn't need to be Spring, or does it?
13. Abhishesh Srivastava – Start with the Kotlin flow
14. Raul Hernandez Lopez – Getting ready for Declarative UIs with Unidirectional Data Flow using Kotlin Coroutines. Unidirectional Data Flow in action: suspend functions, Flow & StateFlow to make our Reactive apps prepared for Declarative UIs.
15. Ulrik Guenther, Kyle Harrington – Realtime 3D graphics and VR with Kotlin and VulkanLet's enjoy the scenery