feat(compose): Support the Kotlin 2.4 compiler plugin by runningcode · Pull Request #1253 · getsentry/sentry-android-gradle-plugin

runningcode · 2026-06-03T10:02:04Z

What

Adds Kotlin 2.4 support to the Compose tracing compiler plugin. Kotlin 2.4 replaced ProjectExtensionDescriptor with ExtensionPointDescriptor as the IrGenerationExtension registration descriptor, so the single shared registration call threw IrGenerationExtension$Companion cannot be cast to ProjectExtensionDescriptor at runtime on the matrix. Registration is now delegated to per-version helpers (registerComposeTracing19/21/22/24), each compiled against its own compiler ABI, with SentryKotlinCompilerPlugin only dispatching via version-stable APIs. A new kotlin2400 variant (built against kotlin-compiler-embeddable:2.4.0) handles 2.4 IR generation.
Fixes a Compose instrumentation bug where chained modifiers (e.g. Modifier.fillMaxSize().padding()) were tagged multiple times. Since Kotlin 2.2 the unified IrFunction.parameters API also lists dispatch/extension/context receivers, so the receivers of chained calls got wrapped too. Wrapping is now restricted to IrParameterKind.Regular arguments. Affects the 2.2.0 and 2.4.0 variants; the 1.9.24 / 2.1.20 variants use the older valueParameters API and are unaffected.
Resolves three CI-matrix compile errors: toLowerCase/toUpperCase(Locale) → lowercase/uppercase, and removes an invalid <Boolean?> type argument on the debug extension property (it stays Property<Boolean>).

Why

The nightly AGP/Gradle/Kotlin test matrix started exercising Kotlin 2.4 and failed at compiler-plugin registration, on top of the pre-existing deprecation and type-mismatch compile errors.

Closes #1257
Fixes Gradle-105

How

The compiler-plugin module's Kotlin Gradle Plugin is bumped to 2.3.21 (not 2.4): a 2.3 compiler can read 2.4.0 metadata to build the kotlin2400 variant, while keeping languageVersion at 1.9 and allowing a stable kotlin-compile-testing (0.12.1).
Each registration helper lives in its own source set, so only the runtime-selected one is loaded — keeping the version-specific descriptor types off every other Kotlin runtime's classpath.

Notes

The kotlin2400 variant is exercised end-to-end by the matrix's sample-app builds; the module's unit tests run on the 2.3 compiler and cover the fixed Extension22 path.
The chained-modifier over-wrapping was a latent bug in the released plugin on Kotlin 2.2+, not new to this PR.

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runningcode · 2026-06-03T14:25:19Z

   * Default is disabled.
   */
-  val debug: Property<Boolean> = objects.property<Boolean?>(Boolean::class.java).convention(false)
+  val debug: Property<Boolean> = objects.property(Boolean::class.java).convention(false)


small breaking API change

runningcode · 2026-06-03T14:25:31Z

 autoServiceAnnotatons = { group = "com.google.auto.service", name = "auto-service-annotations", version = "1.1.1" }
 kotlinJunit = { group = "org.jetbrains.kotlin", name = "kotlin-test-junit", version.ref = "kotlin" }
-kotlinCompileTesting = { group = "dev.zacsweers.kctfork", name = "core", version = "0.7.1" }
+# Pre-release: first kctfork that supports the Kotlin 2.4 compiler. Pin to a stable release once available.


TODO remove this comment

runningcode · 2026-06-03T14:26:22Z

+            // regular value parameters, otherwise modifier-receiver chains (e.g.
+            // Modifier.fillMaxSize().padding()) would each get their receiver wrapped as well.
+            if (
+              valueParameter.kind == IrParameterKind.Regular &&


Seems like this was an existing bug due to an existing bug in kctfork.

See this PR for this change independently: https://github.com/getsentry/sentry-android-gradle-plugin/pull/1254/changes

runningcode · 2026-06-03T14:26:43Z

 plugins {
-  alias(libs.plugins.kotlin) version "2.1.0"
-  alias(libs.plugins.kapt) version "2.1.0"
+  alias(libs.plugins.kotlin) version "2.3.21"


Setting to 2.3.21 let's us keep our language version here at 1.9

runningcode · 2026-06-03T14:27:12Z

+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.name.SpecialNames
+
+// Modified duplicate of JetpackComposeTracingIrExtension22, compiled against 2.4.0


This was generated by claude and I don't have the full context on what to check here, it is mostly a copy.

github-actions · 2026-06-03T14:39:31Z

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against cdd7724

romtsn · 2026-06-03T21:07:01Z

    get() = true

-  val pluginId: String = PLUGIN_ID
+  override val pluginId: String = PLUGIN_ID


oh, I recall doing that #1046 (comment), but I guess now we're compiling against 2.3.x and it should be good?

seems like that is true (since we now have KGP 2.3)

romtsn · 2026-06-03T21:09:34Z

Great work!!

linear-code · 2026-06-04T12:06:58Z

GRADLE-105

Replace deprecated toLowerCase/toUpperCase(Locale) with lowercase/ uppercase, and drop the invalid nullable Boolean type argument on the debug property so it matches the declared Property<Boolean> type. These were failing :plugin-build:compileKotlin on the CI matrix. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Kotlin 2.4 replaced ProjectExtensionDescriptor with ExtensionPointDescriptor as the IrGenerationExtension registration descriptor, so the shared registerExtension call (compiled against one compiler version) threw a ClassCastException at runtime on a mismatched compiler. Move the registration into per-version helpers compiled against their own compiler ABI and have SentryKotlinCompilerPlugin only dispatch using version-stable APIs, so a single artifact registers correctly on every supported Kotlin version. Add a kotlin2400 variant built against 2.4.0 and bump the module's Kotlin Gradle Plugin to 2.4.0 (language version 2.0), which is required to read 2.4 compiler metadata. The instrumentation tests are temporarily ignored because no stable kotlin-compile-testing release supports the 2.4 compiler yet; the 2.4 path remains covered by the sample-app builds in the test matrix. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Kotlin 2.4's unified parameter API lists dispatch/extension/context receivers in IrFunction.parameters, so the 2.4 variant tagged the Modifier receivers of chained calls (e.g. Modifier.fillMaxSize().padding()) in addition to the composable's modifier argument, injecting three sentryTag calls instead of one. Restrict wrapping to IrParameterKind.Regular arguments. Bump kotlin-compile-testing (kctfork) to 0.13.0-alpha01, the first release that supports the Kotlin 2.4 compiler, and re-enable the instrumentation tests that exercise this path. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Build the compiler-plugin module with Kotlin Gradle Plugin 2.3.21 instead of 2.4.0 so the language version can stay at 1.9 and the tests can use a stable kotlin-compile-testing (0.12.1); a 2.3 compiler can still read the 2.4.0 metadata needed to build the kotlin2400 variant. Running the instrumentation tests on the 2.3 compiler surfaced that the unified IrFunction.parameters API (Kotlin 2.2+) also lists dispatch, extension and context receivers, so the 2.2.0 variant tagged the Modifier receivers of chained calls (e.g. Modifier.fillMaxSize().padding()) in addition to the composable's modifier argument. Restrict wrapping to IrParameterKind.Regular arguments, matching the 2.4.0 variant. The 1.9.24 and 2.1.20 variants use the older valueParameters API and are unaffected. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

runningcode requested review from 0xadam-brown, adinauer, markushi and romtsn as code owners June 3, 2026 10:02

cursor Bot reviewed Jun 3, 2026

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Comment thread sentry-kotlin-compiler-plugin/src/main/kotlin/io/sentry/SentryKotlinCompilerPlugin.kt

runningcode commented Jun 3, 2026

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runningcode changed the title ~~fix(build): Resolve Kotlin compile errors in CI matrix~~ feat(compose): Support the Kotlin 2.4 compiler plugin Jun 3, 2026

romtsn reviewed Jun 3, 2026

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Comment thread CHANGELOG.md

romtsn reviewed Jun 3, 2026

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Comment thread CHANGELOG.md

romtsn reviewed Jun 3, 2026

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jonamireh mentioned this pull request Jun 3, 2026

Kotlin 2.4.0 causes ClassCastException #1257

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romtsn approved these changes Jun 3, 2026

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runningcode and others added 7 commits June 4, 2026 14:08

docs(changelog): Note debug property type change

6e04ba2

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

docs(compose): Clarify the regular-parameter filter comment

bc34249

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

docs(build): Drop stale kctfork pre-release comment

cdd7724

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

runningcode force-pushed the claude/elegant-driscoll-fd35e1 branch from d73287f to cdd7724 Compare June 4, 2026 12:12

runningcode merged commit caec0de into main Jun 4, 2026
23 checks passed

runningcode deleted the claude/elegant-driscoll-fd35e1 branch June 4, 2026 12:37

runningcode mentioned this pull request Jun 4, 2026

build(deps): Update kctfork to 0.11.1 #1254

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sentry-release-bot Bot mentioned this pull request Jun 4, 2026

publish: getsentry/[email protected] getsentry/publish#8427

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