This is a transcript of “The State of Kotlin Support in Spring” talk by Sebastian Deleuze from KotlinConf: Do you find this format useful? Please share your feedback with us! TOC: Why Kotlin? (1:30) Spring❤️Kotlin. How much? (3:17) Gradle Kotlin DSL on start.spring.io (5:04) More DSLs (5:28) Spring MVC DSL and functional API (7:21) Coroutines (10:44) What about Spring support for coroutines? (21:15) Reactive types extensions for Coroutines APIs (22:35) Coroutines are now the default way to go Reactive in Kotlin (26:00) Spring Boot (28:04) Kofu: the mother of all DSL (29:43

The following post is written by Paweł Marks and Kamil Doległo. Every programming ecosystem needs documentation to thrive. Kotlin has its roots in the JVM ecosystem, where Javadoc is a standard and universally accepted documentation engine. It was only natural to expect Kotlin to have a similarly seamless tool. That was the initial goal of Dokka – to provide a reliable and simple documentation engine. But the increasing diversity of Kotlin, with features like multiplatform projects, Native support, and so on, requires Dokka to be more complex. The ongoing development of Kotlin 1.4 gave us a ch

We continue to highlight the upcoming changes in 1.4 release. In this blogpost, we want to describe a couple of important features related to coroutines: New functionality to conveniently debug coroutines The ability to define deep recursive functions These changes are already available for you to try in the 1.4.0-RC release! Let’s dive into details. Debugging coroutines Coroutines are great for asynchronous programming (but not only for that), and many people already use them or are starting to use them. When you write code with coroutines, however, trying to debug them can be a real pain.

We’re almost there! We're happy to unveil Kotlin 1.4.0-RC – the release candidate for the next major version of our programming language. Read on to learn about what has changed in Kotlin 1.4.0-RC, and make sure to try its new features before they are officially released with Kotlin 1.4.0. A special thanks to everyone who tried our milestone releases (1.4-M1, 1.4-M2, and 1.4-M3), shared their feedback, and helped us improve this version of Kotlin! This post highlights the new features and key improvements that are available in Kotlin 1.4.0-RC: Improved *.gradle.kts IDE support, with explicit

Registration for Kotlin Heroes #4 is open! It’s time to save the date for the next round, which will take place May 29, at 14:35 UTC. If you’re already excited to sign up, you can head directly over to the registration page on the Codeforces website. And if you’d like to learn more about Kotlin Heroes, take a look at the blog post below. (more…)

We keep working on Kotlin 1.4 and the next preview 1.4-M2 is just around the corner. Right now we’re ready to unveil some improvements from this preview; in this post, we’ll get you acquainted with the standard library changes. Here are some key improvements in the standard library in 1.4-M2: Changes to the existing API like updating signatures and introducing new constants More functions in the common library New functions for Arrays and Collections Property delegation improvements Even though Kotlin 1.4-M2 hasn’t been released yet, we’ve deployed its early version to the Kotlin playground

Hi folks! Today we have released a new version of the Kotlin kernel for Jupyter Notebook, and if you are experimenting with data — give notebooks with Kotlin kernel a try. One of the great things about Jupyter Notebook is its interactive nature. It allows you to quickly get familiar with your data, try out some ideas, and run some experiments. Kotlin kernel helps you iterate over your ideas even faster by featuring enhanced code completion. Previously, the kernel was already capable of completing local symbols, but with this update code completion works for global ones as well. Another n

Today we're happy to present to you the latest version of Kotlin – 1.3.70. This incremental release doesn’t provide any major new features. However, we've tried our best to improve the existing functionality, fix issues, and even add experimental things for you to try. Here are the highlights of Kotlin 1.3.70: New functions and classes for Kotlin collections in the standard library. Various improvements in the IntelliJ Kotlin plugin: improved *.gradle.kts support, testing, debugging, completion, and so on. The Kotlin/JVM compiler now generates type annotations in the bytecode for Java 8 a

We have significantly improved the IDE support for Gradle Kotlin DSL scripts (*.gradle.kts files), and we’d like to share some details with you in this blog post. The changes will be publicly available in the Kotlin 1.3.70 release, but you can already try them by joining the Kotlin 1.3.70 EAP (Early Access Program). Some of you may have experienced the following scenario. You have a project built using Gradle Kotlin DSL scripts. You open the build.gradle.kts file to modify the project build logic, but suddenly your computer starts burning through CPU, your script looks like plain text (with

Registration for the next Kotlin Heroes coding challenge is open! This will be the third challenge for programmers co-hosted by JetBrains and Codeforces. Register now and save the date, February 27, 13:35 UTC. What is Kotlin Heroes, and why should you participate? Kotlin Heroes is a collaborative project from JetBrains, the creator of the Kotlin programing language, and Codeforces, the most popular platform for programming contests. Previous Kotlin Heroes challenges have attracted more than 700 competitors per event. The main objective for the participants is to provide correct solutions t

JetBrains and Touchlab partner to drive Kotlin Multiplatform adoption in 2020 At JetBrains, we’re very delighted to partner with our good friends at Touchlab to increase the adoption of Kotlin Multiplatform Mobile technology in 2020 and beyond. Touchlab has released a toolkit for getting started with Kotlin Multiplatform Mobile technology. It’s a self-contained GitHub project that you can use as a starting point or for evaluating the technology. We had the chance to review it before its general release and can say that we’re excited to share it with the Kotlin Multiplatform community! The f

The KotlinConf session recordings have now all been uploaded to the website, along with the slides if there were any. You can search for a particular talk, or you can watch all of them one by one with the KotlinConf playlist on JetBrains TV. Additionally, all the pictures from the conference are now available! They have been collected into albums and uploaded to the website. (more…)

Ktor 1.3 was released recently, and we’re happy to share the details with you in this blog post. Ktor consists of two parts: the server engine and a flexible asynchronous HTTP client. The current release focuses mainly on the HTTP client. Here you can find the complete changelog for this release. The client is a multiplatform library that supports JVM, JS, Android, and iOS and is now often used in cross-platform mobile applications. Our main goal for the next releases is to make the server engine multiplatform, too. The other areas we’re going to work on are: Improving integration w

During the keynote at KotlinConf, Andrey highlighted our strategic view on the current areas of focus for the evolution of Kotlin, and our plans for Kotlin 1.4 which will be released some time next year. Watch the entire keynote below Our vision is for Kotlin to be a reliable companion for all your endeavors, a default language choice for your tasks. To accomplish this, we’re going to make it shine on all platforms. Multiple case studies from companies well-known in the industry show that we are making good progress in this direction. Kotlin 1.4 that is going to arrive in spring 2020 will mak

We’re happy to present the new release today, Kotlin 1.3.60. In addition to the quality improvements, this version focuses on: Optimizing the comparison of inline classes. Tooling improvements for debugging, J2K converter, and Gradle scripts written in Kotlin. Support for more Kotlin/Native platforms/targets. Improving the Kotlin/MPP IDE experience. For Kotlin/JS, adding support for source maps and improving the platform test runner integration. Preview for some already implemented features of Kotlin 1.4. You can find the complete list of changes in the change log. As always, we’re really

We’re happy to announce the release of Kotlin 1.3.50 today. In addition to the quality and tooling improvements, the main focus for this version has been on: Designing a new Duration and Time Measurement API (available for preview). Working on an improved Java-to-Kotlin converter. Experimental generation of external declarations for npm dependencies in Gradle Kotlin/JS projects (using Dukat). A separate plugin for debugging Kotlin/Native code in IntelliJ IDEA Ultimate. Java compilation support in multiplatform projects. You can find the complete list of changes in the change log. As always

We’re happy to present the new release today, Kotlin 1.3.40. In addition to the quality and tooling improvements the main focus for this version has been on: Gradle support for NPM, Yarn, and Webpack for Kotlin/JS Test runner improvements for multiplatform projects New type inference Performance and interoperability improvements for Kotlin/Native Also, new functions were added to the standard library in an experimental state. You can find the complete list of changes in the change log. As always, we’re really grateful to our external contributors. Let’s dive into the deta

When we say ‘Kotlin is everywhere’, we mean it. Kotlin works on all platforms, and it allows you to develop all types of applications. Developers are excited about Kotlin and hungry for opportunities to learn more. Now it’s time to bring it to your city with the support of JetBrains and Google. We’re happy to announce our new program, Kotlin/Everywhere – a series of community-driven events focusing on the potential of Kotlin on all platforms. Its goal is to help people learn the essentials and best practices of using Kotlin everywhere, be it for Android, iOS, back-end, or front-end. Join t

We’re happy to announce the release of Kotlin 1.3.30, a new bug fix and tooling update for Kotlin 1.3. The main areas of focus for this release have been around Kotlin/Native, KAPT performance, as well as improvements for IntelliJ IDEA. As always, we’d like to thank our external contributors. Now let’s dive into the details!

We’re happy to announce the release of Kotlin 1.3.20, a new bug fix and tooling update for Kotlin 1.3. In addition to improvements to the compiler and IDE, this version: Allows running Gradle tasks in parallel within a single project Allows building multiplatform projects via Gradle Kotlin DSL Brings improvements for inline classes Introduces a separate command line tool for Kapt Enables incremental compilation for Kotlin/JS by default Brings improvements to Kotlin/Native As always, we’d like to thank our numerous external contributors. The complete list of changes for this release can be