KTOR-7866: Update Kotlin to v2.1.0 (#4512)

* Update Kotlin to v2.1.0
* Update yarn.lock
* Update kotlinter to 5.0.0
* Disable JteTest (KTOR-8030)
* Decrease Kotlin daemon Xmx (KTOR-8035)

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Osip Fatkullin <osip.fatkullin@jetbrains.com>

README.md

@@ -9,7 +9,7 @@
 
 [![Official JetBrains project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 [![Maven Central](https://img.shields.io/maven-central/v/io.ktor/ktor-server)](https://central.sonatype.com/search?namespace=io.ktor)
-[![Kotlin](https://img.shields.io/badge/kotlin-2.0.20-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.1.0-blue.svg?logo=kotlin)](http://kotlinlang.org)
 [![Slack channel](https://img.shields.io/badge/chat-slack-green.svg?logo=slack)](https://kotlinlang.slack.com/messages/ktor/)
 [![GitHub License](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](http://www.apache.org/licenses/LICENSE-2.0)
 [![Contribute with Gitpod](https://img.shields.io/badge/Contribute%20with-Gitpod-908a85?logo=gitpod)](https://gitpod.io/#/~https://github.com/ktorio/ktor)

build.gradle.kts

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2014-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
 
 import org.jetbrains.dokka.gradle.DokkaMultiModuleTask

buildSrc/src/main/kotlin/Codestyle.kt

@@ -10,7 +10,7 @@ fun Project.configureCodestyle() {
     apply(plugin = "org.jmailen.kotlinter")
 
     kotlinter.apply {
-        ignoreFailures = true
+        ignoreLintFailures = true
         reporters = arrayOf("checkstyle", "plain")
     }
 

buildSrc/src/main/kotlin/Train.kt

@@ -1,12 +1,12 @@
 /*
- * Copyright 2014-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2014-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
-import internal.*
-import org.gradle.api.*
-import org.gradle.api.provider.*
-import org.gradle.api.tasks.testing.*
-import org.gradle.kotlin.dsl.*
-import org.jetbrains.kotlin.gradle.dsl.*
+import internal.libs
+import org.gradle.api.Project
+import org.gradle.api.provider.Provider
+import org.gradle.api.tasks.testing.Test
+import org.gradle.kotlin.dsl.withType
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 
 fun Project.filterSnapshotTests() {
     if (!buildSnapshotTrain) return
@@ -90,7 +90,7 @@ fun Project.getKotlinLanguageVersion(): KotlinVersion =
 private fun Project.resolveKotlinLanguageVersion(): KotlinVersion {
     val languageVersion = rootProject.findProperty("kotlin_language_version")
         ?.let { KotlinVersion.fromVersion(it.toString()) }
-        ?: KotlinVersion.KOTLIN_2_0
+        ?: KotlinVersion.KOTLIN_2_1
     logger.info("Kotlin language version: $languageVersion")
 
     return languageVersion

gradle.properties

@@ -1,5 +1,5 @@
 #
-# Copyright 2014-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+# Copyright 2014-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
 #
 
 # styleguide
@@ -31,7 +31,7 @@ version=3.1.0-SNAPSHOT
 #   To save some memory, shutting down Kotlin Daemon used for buildSrc compilation after 30 seconds of idle.
 #   See: /~https://github.com/gradle/gradle/issues/29331
 org.gradle.jvmargs=-Xms2g -Xmx8g -XX:+HeapDumpOnOutOfMemoryError -XX:+UseParallelGC -Dfile.encoding=UTF-8 -Dkotlin.daemon.jvm.options=-Xmx512m,Xms256m,-XX:MaxMetaspaceSize=256m,XX:+HeapDumpOnOutOfMemoryError
-kotlin.daemon.jvmargs=-Xms512m -Xmx4g -XX:MaxMetaspaceSize=256m -XX:+HeapDumpOnOutOfMemoryError
+kotlin.daemon.jvmargs=-Xms512m -Xmx2g -XX:MaxMetaspaceSize=256m -XX:+HeapDumpOnOutOfMemoryError
 # Gradle Doctor might increase memory consumption when task monitoring is enabled, so it is disabled by default.
 # Some features can't work without task monitoring:
 #  doctor-negative-savings, doctor-slow-build-cache-connection, doctor-slow-maven-connection
@@ -47,14 +47,10 @@ org.gradle.parallel=true
 kotlin.native.ignoreDisabledTargets=true
 kotlin.mpp.stability.nowarn=true
 kotlin.mpp.enableCInteropCommonization=true
-kotlin.incremental.js.ir=false
-kotlin.incremental.js.klib=false
-kotlin.incremental.multiplatform=false
+kotlin.incremental.wasm=true
 kotlin.mpp.applyDefaultHierarchyTemplate=false
 kotlin.apple.xcodeCompatibility.nowarn=true
 kotlin.suppressGradlePluginWarnings=IncorrectCompileOnlyDependencyWarning
-#kotlinx.atomicfu.enableJvmIrTransformation=true
-#kotlinx.atomicfu.enableNativeIrTransformation=true
 kotlin.daemon.useFallbackStrategy=false
 
 # dokka

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 
-kotlin = "2.0.21"
+kotlin = "2.1.0"
 kotlinx-html = "0.11.0"
 kotlinx-datetime = "0.6.1"
 kotlinx-io = "0.6.0"
@@ -10,7 +10,7 @@ serialization = "1.7.3"
 binaryCompatibilityValidator = "0.17.0"
 dokka = "1.9.20"
 kover = "0.9.1"
-ktlint = "4.5.0"
+kotlinter = "5.0.0"
 kotlinx-browser = "0.3"
 
 # Used for test server in buildSrc
@@ -227,7 +227,7 @@ tomlj = { module = "org.tomlj:tomlj", version.ref = "tomlj" }
 
 develocity = { module = "com.gradle:develocity-gradle-plugin", version.ref = "develocity" }
 develocity-commonCustomUserData = { module = "com.gradle:common-custom-user-data-gradle-plugin", version.ref = "develocity-commonCustomUserData" }
-kotlinter = { module = "org.jmailen.gradle:kotlinter-gradle", version.ref = "ktlint" }
+kotlinter = { module = "org.jmailen.gradle:kotlinter-gradle", version.ref = "kotlinter" }
 gradleDoctor = { module = "com.osacky.doctor:doctor-plugin", version.ref = "gradleDoctor" }
 
 [plugins]

kotlin-js-store/yarn.lock

@@ -122,28 +122,12 @@
   dependencies:
     "@types/node" "*"
 
-"@types/eslint-scope@^3.7.3":
-  version "3.7.7"
-  resolved "https://registry.yarnpkg.com/@types/eslint-scope/-/eslint-scope-3.7.7.tgz#3108bd5f18b0cdb277c867b3dd449c9ed7079ac5"
-  integrity sha512-MzMFlSLBqNF2gcHWO0G1vP/YQyfvrxZ0bF+u7mzUdZ1/xK4A4sru+nraZz5i3iEIk1l1uyicaDVTB4QbbEkAYg==
-  dependencies:
-    "@types/eslint" "*"
-    "@types/estree" "*"
-
-"@types/eslint@*":
-  version "8.44.8"
-  resolved "https://registry.yarnpkg.com/@types/eslint/-/eslint-8.44.8.tgz#f4fe1dab9b3d3dd98082d4b9f80e59ab40f1261c"
-  integrity sha512-4K8GavROwhrYl2QXDXm0Rv9epkA8GBFu0EI+XrrnnuCl7u8CWBRusX7fXJfanhZTDWSAL24gDI/UqXyUM0Injw==
-  dependencies:
-    "@types/estree" "*"
-    "@types/json-schema" "*"
-
-"@types/estree@*", "@types/estree@^1.0.5":
+"@types/estree@^1.0.5":
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.5.tgz#a6ce3e556e00fd9895dd872dd172ad0d4bd687f4"
   integrity sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==
 
-"@types/json-schema@*", "@types/json-schema@^7.0.8":
+"@types/json-schema@^7.0.8":
   version "7.0.15"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841"
   integrity sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==
@@ -851,7 +835,7 @@ engine.io@~6.5.2:
     engine.io-parser "~5.2.1"
     ws "~8.11.0"
 
-enhanced-resolve@^5.17.0:
+enhanced-resolve@^5.17.1:
   version "5.17.1"
   resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-5.17.1.tgz#67bfbbcc2f81d511be77d686a90267ef7f898a15"
   integrity sha512-LMHl3dXhTcfv8gM4kEzIUeTQ+7fpdA0l2tUf34BddXPkz2A5xJ5L/Pchd5BL6rdccM9QGvu0sWZzK1Z1t4wwyg==
@@ -1443,10 +1427,10 @@ karma-webpack@5.0.1:
     minimatch "^9.0.3"
     webpack-merge "^4.1.5"
 
-karma@6.4.3:
-  version "6.4.3"
-  resolved "https://registry.yarnpkg.com/karma/-/karma-6.4.3.tgz#763e500f99597218bbb536de1a14acc4ceea7ce8"
-  integrity sha512-LuucC/RE92tJ8mlCwqEoRWXP38UMAqpnq98vktmS9SznSoUPPUJQbc91dHcxcunROvfQjdORVA/YFviH+Xci9Q==
+karma@6.4.4:
+  version "6.4.4"
+  resolved "https://registry.yarnpkg.com/karma/-/karma-6.4.4.tgz#dfa5a426cf5a8b53b43cd54ef0d0d09742351492"
+  integrity sha512-LrtUxbdvt1gOpo3gxG+VAJlJAEMhbWlM4YrFQgql98FwF7+K8K12LYO4hnDdUkNjeztYrOXEMqgTajSWgmtI/w==
   dependencies:
     "@colors/colors" "1.5.0"
     body-parser "^1.19.0"
@@ -1478,6 +1462,13 @@ kind-of@^6.0.2:
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.3.tgz#07c05034a6c349fa06e24fa35aa76db4580ce4dd"
   integrity sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==
 
+kotlin-web-helpers@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/kotlin-web-helpers/-/kotlin-web-helpers-2.0.0.tgz#b112096b273c1e733e0b86560998235c09a19286"
+  integrity sha512-xkVGl60Ygn/zuLkDPx+oHj7jeLR7hCvoNF99nhwXMn8a3ApB4lLiC9pk4ol4NHPjyoCbvQctBqvzUcp8pkqyWw==
+  dependencies:
+    format-util "^1.0.5"
+
 lines-and-columns@^1.1.6:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/lines-and-columns/-/lines-and-columns-1.2.4.tgz#eca284f75d2965079309dc0ad9255abb2ebc1632"
@@ -1601,10 +1592,10 @@ mkdirp@^0.5.5:
   dependencies:
     minimist "^1.2.6"
 
-mocha@10.7.0:
-  version "10.7.0"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-10.7.0.tgz#9e5cbed8fa9b37537a25bd1f7fb4f6fc45458b9a"
-  integrity sha512-v8/rBWr2VO5YkspYINnvu81inSz2y3ODJrhO175/Exzor1RcEZZkizgE2A+w/CAXXoESS8Kys5E62dOHGHzULA==
+mocha@10.7.3:
+  version "10.7.3"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-10.7.3.tgz#ae32003cabbd52b59aece17846056a68eb4b0752"
+  integrity sha512-uQWxAu44wwiACGqjbPYmjo7Lg8sFrS3dQe7PP2FQI+woptP4vZXSMcfMyFL/e1yFEeEpV4RtyTpZROOKmxis+A==
   dependencies:
     ansi-colors "^4.1.3"
     browser-stdout "^1.3.1"
@@ -2422,12 +2413,11 @@ webpack-sources@^3.2.3:
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-3.2.3.tgz#2d4daab8451fd4b240cc27055ff6a0c2ccea0cde"
   integrity sha512-/DyMEOrDgLKKIG0fmvtz+4dUX/3Ghozwgm6iPp8KRhvn+eQf9+Q7GWxVNMk3+uCPWfdXYC4ExGBckIXdFEfH1w==
 
-webpack@5.93.0:
-  version "5.93.0"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-5.93.0.tgz#2e89ec7035579bdfba9760d26c63ac5c3462a5e5"
-  integrity sha512-Y0m5oEY1LRuwly578VqluorkXbvXKh7U3rLoQCEO04M97ScRr44afGVkI0FQFsXzysk5OgFAxjZAb9rsGQVihA==
+webpack@5.94.0:
+  version "5.94.0"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-5.94.0.tgz#77a6089c716e7ab90c1c67574a28da518a20970f"
+  integrity sha512-KcsGn50VT+06JH/iunZJedYGUJS5FGjow8wb9c0v5n1Om8O1g4L6LjtfxwlXIATopoQu+vOXXa7gYisWxCoPyg==
   dependencies:
-    "@types/eslint-scope" "^3.7.3"
     "@types/estree" "^1.0.5"
     "@webassemblyjs/ast" "^1.12.1"
     "@webassemblyjs/wasm-edit" "^1.12.1"
@@ -2436,7 +2426,7 @@ webpack@5.93.0:
     acorn-import-attributes "^1.9.5"
     browserslist "^4.21.10"
     chrome-trace-event "^1.0.2"
-    enhanced-resolve "^5.17.0"
+    enhanced-resolve "^5.17.1"
     es-module-lexer "^1.2.1"
     eslint-scope "5.1.1"
     events "^3.2.0"

ktor-io/posix/src/io/ktor/utils/io/locks/Synchronized.kt

@@ -1,16 +1,16 @@
 /*
- * Copyright 2014-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2014-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
 
 package io.ktor.utils.io.locks
 
 import io.ktor.io.interop.mutex.*
 import io.ktor.utils.io.*
 import kotlinx.cinterop.*
-import platform.posix.*
+import platform.posix.pthread_self
+import platform.posix.pthread_t
 import kotlin.concurrent.AtomicNativePtr
 import kotlin.concurrent.AtomicReference
-import kotlin.native.concurrent.*
 import kotlin.native.internal.NativePtr
 
 /**
@@ -217,18 +217,13 @@ public actual open class SynchronizedObject {
         }
     }
 
-    @OptIn(FreezingIsDeprecated::class)
     protected class LockState(
         public val status: Status,
         public val nestedLocks: Int,
         public val waiters: Int,
         public val ownerThreadId: pthread_t? = null,
         public val mutex: CPointer<ktor_mutex_node_t>? = null
-    ) {
-        init {
-            freeze()
-        }
-    }
+    )
 
     protected enum class Status { UNLOCKED, THIN, FAT }
 

ktor-server/ktor-server-core/posix/src/io/ktor/server/config/ConfigLoadersNix.kt

@@ -1,11 +1,10 @@
 /*
- * Copyright 2014-2022 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2014-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
 
 package io.ktor.server.config
 
 import io.ktor.server.engine.*
-import io.ktor.utils.io.*
 
 internal actual val CONFIG_PATH: List<String>
     get() = listOfNotNull(
@@ -18,6 +17,7 @@ internal actual val CONFIG_PATH: List<String>
 public actual val configLoaders: List<ConfigLoader>
     get() = _configLoaders
 
+@Suppress("ObjectPropertyName")
 private val _configLoaders: MutableList<ConfigLoader> = mutableListOf()
 
 public fun addConfigLoader(loader: ConfigLoader) {

ktor-server/ktor-server-plugins/ktor-server-jte/jvm/test/io/ktor/tests/jte/JteTest.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2012 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2014-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
 
 package io.ktor.tests.jte
@@ -28,6 +28,8 @@ import java.util.zip.*
 import kotlin.test.*
 import kotlin.text.Charsets
 
+// TODO KTOR-8030: Enable tests after updating JTE
+@Ignore
 class JteTest {
 
     @Test