Proguard/R8 build issue

[4brunu]

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• I have searched for duplicate or closed issues and discussions.

Language and Async Model

Kotlin - Coroutines, Kotlin

Amplify Categories

Authentication

Gradle script dependencies

implementation("com.amplifyframework:aws-auth-cognito:2.27.1")
implementation("com.amplifyframework:core-kotlin:2.27.1")

Environment information

------------------------------------------------------------
Gradle 8.13
------------------------------------------------------------

Build time:    2025-02-25 09:22:14 UTC
Revision:      073314332697ba45c16c0a0ce1891fa6794179ff

Kotlin:        2.0.21
Groovy:        3.0.22
Ant:           Apache Ant(TM) version 1.10.15 compiled on August 25 2024
Launcher JVM:  21.0.6 (Azul Systems, Inc. 21.0.6+7-LTS)
Daemon JVM:    /Library/Java/JavaVirtualMachines/zulu-21.jdk/Contents/Home (no JDK specified, using current Java home)
OS:            Mac OS X 15.3.1 aarch64

Please include any relevant guides or documentation you're referencing

No response

Describe the bug

I was in version 2.25.1 but when I upgraded to version 2.26.0 or 2.27.1 I got the following build error related to pro guard/R8.

Task ':projectandroid:minifyProjectAdhocWithR8' is not up-to-date because:
  No history is available.
R8 is a new Android code shrinker. If you experience any issues, please file a bug at
https://issuetracker.google.com, using 'Shrinker (R8)' as component name.
Current version is: 8.8.34.

file or directory '/Users/User/Developer/ProjectAndroid/projectandroid/build/intermediates/generated_proguard_file/projectAdhoc/mergeProjectAdhocGeneratedProguardFiles/proguard.txt', not found
WARNING: R8: The class androidx.navigation.NavType is present but not the method androidx.navigation.NavType androidx.navigation.NavType$Companion.fromArgType(java.lang.String, java.lang.String) which suggests some unsupported set-up where androidx is pre-shrunk without keeping the method androidx.navigation.NavType androidx.navigation.NavType$Companion.fromArgType(java.lang.String, java.lang.String).
ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /Users/User/Developer/ProjectAndroid/projectandroid/build/outputs/mapping/projectAdhoc/missing_rules.txt.
ERROR: R8: Missing class aws.smithy.kotlin.runtime.http.engine.okhttp4.OkHttp4Engine (referenced from: void com.amplifyframework.util.AmplifyHttpKt.setHttpEngine(aws.smithy.kotlin.runtime.http.config.HttpClientConfig$Builder))

> Task :projectandroid:minifyProjectAdhocWithR8 FAILED

and the content of the file missing_rules.txt

# Please add these rules to your existing keep rules in order to suppress warnings.
# This is generated automatically by the Android Gradle plugin.
-dontwarn aws.smithy.kotlin.runtime.http.engine.okhttp4.OkHttp4Engine

Reproduction steps (if applicable)

Import those two dependencies to a project and perform a build with proguard/R8

implementation("com.amplifyframework:aws-auth-cognito:2.27.1")
implementation("com.amplifyframework:core-kotlin:2.27.1")

Code Snippet

// Put your code below this line.

Log output

// Put your logs below this line

amplifyconfiguration.json

No response

GraphQL Schema

// Put your schema below this line

Additional information and screenshots

No response

[vincetran]

Thanks for filing this issue @4brunu, I will take a look at this today.

[mattcreaser]

Hi @4brunu. We are adding the missing rules in the above linked PR, and this should be released this week. In the meantime you can workaround this issue by adding the same rules to your own proguard file.

[vincetran]

Hi @4brunu, thanks for bringing up this issue. The fix for this has been released as part of v 2.27.2.

[github-actions]

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