R8 failure during minifyProdReleaseWithR8 with java.lang.IllegalArgumentException related to kotlinx-metadata-jvm [401499257]

WAI

Bug

Status Update

No update yet.

Description

ma...@gmail.com

created issue #1

Mar 7, 2025 07:30PM

When building a Flutter app for release using R8, the build fails with the following exception:

ERROR: R8: java.lang.IllegalArgumentException: Provided Metadata instance has version 2.1.0, while maximum supported version is 2.0.0. To support newer versions, update the kotlinx-metadata-jvm library.

As a workaround, I was forced to disable options: minifyEnabled and shrinkResources which increases app size and reduces performance — clearly not ideal.

Steps to reproduce:

I tried to build my app for release with:

flutter build appbundle --flavor flav --dart-define=FLAVOR=flav --target=lib/main.dart -v

The build fails during the minifyProdReleaseWithR8 task. Log attached.

My environment:

•	R8 Version: 8.3.37 (build 3ccc501316db4344828180e7152a4adb97522bf8)
•	Android Gradle Plugin Version: 8.8.2
•	Kotlin Version: 2.1.0
•	kotlinx-metadata-jvm Version: 0.9.0
•	Java Version: 18
•	NDK Version: 26.3.11579264
•	Target SDK: 35
•	minSdkVersion: 24

Let me know if you need any additional info.

Mateusz

log_error_r8.txt

31 KB

View

Download

Comments

ch...@google.com <ch...@google.com> #2Mar 7, 2025 07:36PM

Reassigned to ch...@google.com.

AGP 8.8 ships with R8 8.8. If you are using R8 8.3.37 you must explicitly be downgrading R8 several versions. Can you try using the R8 8.8 that ships with AGP 8.8.2?

Message last modified on Mar 7, 2025 07:38PM

ma...@gmail.com <ma...@gmail.com> #3Mar 7, 2025 08:40PM

I cleared my cache and the entire project, and I directly pointed to version 8.8 in the build.gradle (check attachment), but still the version being used is:

Current version is: 8.3.37 (build 3ccc501316db4344828180e7152a4adb97522bf8 from go/r8bot (luci-r8-custom-ci-focal-17-2jq9)).

I also tried not to define the version of R8, but the same build version is always used.

build.gradle

1.1 KB

Download

sg...@google.com <sg...@google.com> #4Mar 10, 2025 08:56AM

Please take a look at https://r8.googlesource.com/r8#replacing-r8-in-agp for the official way of overriding the R8 version shipping with AGP (it needs to go into pluginManagement).

ch...@google.com <ch...@google.com> #5Mar 12, 2025 08:14PM

Status: Won't Fix (Intended Behavior)

Closing this as WAI since this is due to using an old version of R8 that does not support kotlinx-metadata-jvm 2.1.0. If you are still unable to find the cause of the version downgrade then please let us know.

ma...@gmail.com <ma...@gmail.com> #6Mar 29, 2025 06:03PM

Hi team,

Quick update - the issue is now resolved after I manually forced the correct R8 version.

Thank you! Mateusz

sg...@google.com <sg...@google.com> #7Mar 31, 2025 07:44AM

Thank you for reporting back. However, if you have to force the R8 version when using AGP 8.8 it looks as if there is some issue hiding in your setup.

Issue 401499257