Kotlin
It seems that this release includes only bug fixes
https://github.com/JetBrains/kotlin/releases/tag/v2.1.20-RC2
2.1.20-RC2It seems that this release includes only bug fixes
https://github.com/JetBrains/kotlin/releases/tag/v2.1.20-RC2
GitHub
Release Kotlin 2.1.20-RC2 · JetBrains/kotlin
Changelog
Compiler
KT-75649 K2: NPE on assigning platform type value to non-nullable lateinit var
KT-75483 Native: redundant unboxing generated with smart cast
KT-75526 Regression in K2 scripting:...
Compiler
KT-75649 K2: NPE on assigning platform type value to non-nullable lateinit var
KT-75483 Native: redundant unboxing generated with smart cast
KT-75526 Regression in K2 scripting:...
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Kotlin 2.1.20-RC3
It seems that this release includes only bug fixes
https://github.com/JetBrains/kotlin/releases/tag/v2.1.20-RC3
It seems that this release includes only bug fixes
https://github.com/JetBrains/kotlin/releases/tag/v2.1.20-RC3
GitHub
Release Kotlin 2.1.20-RC3 · JetBrains/kotlin
Changelog
Compiler
KT-75578 K2: False negative [SUPER_CALL_WITH_DEFAULT_PARAMETERS] when calling the upper-class implementation of a method with the default value argument
KT-75965 The iOS app did...
Compiler
KT-75578 K2: False negative [SUPER_CALL_WITH_DEFAULT_PARAMETERS] when calling the upper-class implementation of a method with the default value argument
KT-75965 The iOS app did...
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Kotlin Roadmap updated: https://kotlinlang.org/docs/roadmap.html
Kotlin Help
Kotlin roadmap | Kotlin
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Creator of the Spring Framework: I basically had no desire to write Java, at all
https://www.youtube.com/watch?v=MQuPfZsiVx8
https://www.youtube.com/watch?v=MQuPfZsiVx8
YouTube
What is your opinion?
Catch Rod Johnson at KotlinConf 2025 👉 https://kotlinconf.com/speakers/7d983480-a141-4710-bbf5-4b90c23c9b9b/
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Update on KT-14663 by Mikhail Zarechenskiy:
https://youtrack.jetbrains.com/issue/KT-14663/Support-having-a-public-and-a-private-type-for-the-same-property#focus=Comments-27-11853379.0-0
https://youtrack.jetbrains.com/issue/KT-14663/Support-having-a-public-and-a-private-type-for-the-same-property#focus=Comments-27-11853379.0-0
YouTrack
Support having a "public" and a "private" type for the same property : KT-14663
Description Use case: We often store something as, say, an ArrayList, but expose it as a read-only List, or a MutableList. But internally we want to access it as an ArrayList. There are a few possible solutions to this. One is to explicitly have "public"…
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In Kotlin version 2.2.0 context parameters are released as Beta 🎉
https://blog.jetbrains.com/kotlin/2025/04/update-on-context-parameters/
https://blog.jetbrains.com/kotlin/2025/04/update-on-context-parameters/
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The JetBrains Blog
Update on Context Parameters | The Kotlin Blog
Context parameters will be replacing context receivers in Kotlin, with version 2.2.0 featuring them as Beta. We are committed to providing an easy migration between both features, including dedicated compiler and IntelliJ IDEA support.
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New KSP release with KSP2 enabled by default!
https://github.com/google/ksp/releases/tag/2.1.20-2.0.0
https://github.com/google/ksp/releases/tag/2.1.20-2.0.0
GitHub
Release 2.1.20-2.0.0 · google/ksp
What's Changed
Bumped version to 2.0.0 and enabled KSP2 by default!
No-op blockOtherCompilerPlugins #2397
A couple of fixes to compilation avoidance #2401
KSTypeReferenceResolvedImpl.toString(...
Bumped version to 2.0.0 and enabled KSP2 by default!
No-op blockOtherCompilerPlugins #2397
A couple of fixes to compilation avoidance #2401
KSTypeReferenceResolvedImpl.toString(...
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Kotlin 🎉
🚀 Major New Features
🔹 Context-Sensitive Resolution (KT-75315, KT-75316, KT-75061)
🔹 Context Parameters (KT-74546, KT-72639, KT-75017)
🔹 K2 Compiler Enhancements
🔹 -Xjvm-default=all-compatibility is now default (KT-71768)
🔹 New Annotations: @MustUseValue, @IgnorableValue (KT-74804)
🔹 Unnamed Local Variables (KT-74809)
https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-Beta1
2.2.0-Beta1 🚀 Major New Features
🔹 Context-Sensitive Resolution (KT-75315, KT-75316, KT-75061)
🔹 Context Parameters (KT-74546, KT-72639, KT-75017)
🔹 K2 Compiler Enhancements
🔹 -Xjvm-default=all-compatibility is now default (KT-71768)
🔹 New Annotations: @MustUseValue, @IgnorableValue (KT-74804)
🔹 Unnamed Local Variables (KT-74809)
https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-Beta1
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GitHub
Release Kotlin 2.2.0-Beta1 · JetBrains/kotlin
Changelog
Analysis API
KT-75880 K2 Mode: Typealias reference resolves to the underlying class in KMP project
KT-74246 KaVisibilityChecker.isVisible is inefficient with multiple calls on the same u...
Analysis API
KT-75880 K2 Mode: Typealias reference resolves to the underlying class in KMP project
KT-74246 KaVisibilityChecker.isVisible is inefficient with multiple calls on the same u...
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K2 mode is the default in IntelliJ IDEA 2025.1
https://blog.jetbrains.com/idea/2025/04/k2-mode-in-intellij-idea-2025-1-current-state-and-faq/
https://blog.jetbrains.com/idea/2025/04/k2-mode-in-intellij-idea-2025-1-current-state-and-faq/
The JetBrains Blog
K2 Mode in IntelliJ IDEA 2025.1: Current State and FAQ | The IntelliJ IDEA Blog
Starting with IntelliJ IDEA 2025.1, K2 mode, a new implementation of Kotlin support, will be enabled by default. This change is an important step in the ongoing effort to improve Kotlin support in the
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- Kotlin
- Mellum Goes Open Source: A Purpose-Built LLM for Developers, Now on Hugging Face – LLM behind Idea's code completion
- Structuring Ktor Projects Using Domain-Driven Design (DDD) Concepts: A Step-by-Step Guide With a Minimalistic CRM – Architecture for your next Ktor application
2.1.21-RC2 (with just one fix in Kotlin/JS gradle tooling)- Mellum Goes Open Source: A Purpose-Built LLM for Developers, Now on Hugging Face – LLM behind Idea's code completion
- Structuring Ktor Projects Using Domain-Driven Design (DDD) Concepts: A Step-by-Step Guide With a Minimalistic CRM – Architecture for your next Ktor application
The JetBrains Blog
Mellum Goes Open Source: A Purpose-Built LLM for Developers, Now on Hugging Face | The JetBrains Blog
Mellum doesn't pretend to know everything, but it does one thing exceptionally well. We call it a focal model – small, efficient, and built with a specialized focus.
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Kotlin
- `context()` and `contextOf<T>()` added to stdlib for context parameters
- jvm target bytecode v24 support (who cares?)
- Kotlin 1.6 and 1.7 language versions retired
- let's try context-sensitive resolution? `-Xcontext-sensitive-resolution`
https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-Beta2
2.2.0-Beta2- `context()` and `contextOf<T>()` added to stdlib for context parameters
- jvm target bytecode v24 support (who cares?)
- Kotlin 1.6 and 1.7 language versions retired
- let's try context-sensitive resolution? `-Xcontext-sensitive-resolution`
https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-Beta2
YouTrack
Standard library functions to work with context parameters : KT-72866
See https://github.com/Kotlin/KEEP/blob/context-parameters/proposals/context-parameters.md#standard-library-support 1. The "context" function adds a new value to the context, in an anonymous manner. 2. We also provide a generic way to obtain a value by type…
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