Cannot compile my project with AGP >=8.0.0 due to R8 error

[evgfilim1]

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Steps to reproduce

1. Create a new Flutter project.
2. Add flutter_secure_storage: ^9.2.2 to dependencies of pubspec.yaml
3. Change AGP version to 8.5.0 in android/settings.gradle (com.android.application plugin) or any other 8.x.y.
4. Change Gradle Wrapper version to 8.7 in android/gradle/wrapper/gradle-wrapper.properties or any other which support the above specified AGP version.
5. Build or run Flutter app in release mode (flutter build apk or flutter run --release).

Expected behavior

Builds successfully

Actual behavior

ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /home/evgfilim1/Projects/flutter_experiments/build/app/outputs/mapping/devRelease/missing_rules.txt.
ERROR: R8: Missing class com.google.errorprone.annotations.CanIgnoreReturnValue (referenced from: com.google.crypto.tink.KeysetManager com.google.crypto.tink.KeysetManager.add(com.google.crypto.tink.KeyTemplate) and 52 other contexts)
Missing class com.google.errorprone.annotations.CheckReturnValue (referenced from: com.google.crypto.tink.InsecureSecretKeyAccess and 1 other context)
Missing class com.google.errorprone.annotations.Immutable (referenced from: com.google.crypto.tink.InsecureSecretKeyAccess and 40 other contexts)
Missing class com.google.errorprone.annotations.RestrictedApi (referenced from: com.google.crypto.tink.aead.AesEaxKey$Builder com.google.crypto.tink.aead.AesEaxKey.builder() and 6 other contexts)
Missing class javax.annotation.Nullable (referenced from: java.lang.Object com.google.crypto.tink.PrimitiveSet$Entry.fullPrimitive and 86 other contexts)
Missing class javax.annotation.concurrent.GuardedBy (referenced from: com.google.crypto.tink.proto.Keyset$Builder com.google.crypto.tink.KeysetManager.keysetBuilder and 3 other contexts)

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:minifyDevReleaseWithR8'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.R8Task$R8Runnable
   > Compilation failed to complete

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 35s

Versions

• Flutter (Channel beta, 3.23.0-0.1.pre, on Arch Linux 6.9.7-zen1-1-zen, locale en_US.UTF-8)
• Android SDK version 35.0.0
• flutter_secure_storage: ^9.2.2

Additional notes

• The issue is not reproducible on AGP <8.0.0
• Adding android.enableR8.fullMode=false to android/gradle.properties doesn't help

[anisalibegic]

I'm having the same problem. There is no error when I remove flutter_secure_storage from my app.

[evgfilim1]

Workaround

After applying it, the project compiles successfully and seems like no errors are emitted at runtime.

1. Create a new file named android/app/proguard-rules.pro if it doesn't exist yet.
2. Copy-paste the content below to the file.

# https://github.com/mogol/flutter_secure_storage/issues/748
-dontwarn com.google.errorprone.annotations.CanIgnoreReturnValue
-dontwarn com.google.errorprone.annotations.CheckReturnValue
-dontwarn com.google.errorprone.annotations.Immutable
-dontwarn com.google.errorprone.annotations.RestrictedApi
-dontwarn javax.annotation.Nullable
-dontwarn javax.annotation.concurrent.GuardedBy

[juliansteenbakker]

I will add the workaround above to the package asap.

[RothaSoeurn]

Execution failed for task ':app:minifyReleaseWithR8'. help me

[RothaSoeurn]

ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /Users/macbook/projects/tenh100-ecom/build/app/outputs/mapping/release/missing_rules.txt. ERROR: R8: Missing class org.slf4j.impl.StaticLoggerBinder (referenced from: void org.slf4j.LoggerFactory.bind() and 3 other contexts)

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:minifyReleaseWithR8'.

A failure occurred while executing com.android.build.gradle.internal.tasks.R8Task$R8Runnable Compilation failed to complete

• Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. Get more help at https://help.gradle.org.

[DyoungDsea]

this flutter_secure_storage is the issue

Workaround

After applying it, the project compiles successfully and seems like no errors are emitted at runtime.

1. Create a new file named android/app/proguard-rules.pro if it doesn't exist yet.
2. Copy-paste the content below to the file.

# https://github.com/mogol/flutter_secure_storage/issues/748
-dontwarn com.google.errorprone.annotations.CanIgnoreReturnValue
-dontwarn com.google.errorprone.annotations.CheckReturnValue
-dontwarn com.google.errorprone.annotations.Immutable
-dontwarn com.google.errorprone.annotations.RestrictedApi
-dontwarn javax.annotation.Nullable
-dontwarn javax.annotation.concurrent.GuardedBy

this solved the problem

[w568w]

Update: stop relying on this workaround. Just upgrade your flutter_secure_storage dependency version.

---

For anyone caring about this issue: **it is a really, really bad workaround to suppress all errors with `-dontwarn`. It could theoretically break your project or crash your app.**

This error, which was a compile warning before AGP 8.0, has now been elevated to a compile error. Essentially, it is trying to tell you that some classes referenced in your project cannot be found.

In some cases, you can still ignore it completely using -dontwarn like you did before AGP 8.0; however, in most cases, you should find the missing classes rather than suppressing the error to avoid ignoring the underlying issues.

Let's take a look at the missing classes in this issue:

For com.google.errorprone.annotations.*, it's clear that it is part of the error_prone_annotations package.

For javax.annotation.Nullable, it is actually part of the optional feature called JSR 305. The most "popular" implementation available atm is spotbugs-annotations.

So the solution is clear:

(Real) Workaround

Add these lines to your android/app/build.gradle's dependencies section:

implementation 'com.google.errorprone:error_prone_annotations:2.36.0' // required by flutter_secure_storage
implementation 'com.github.spotbugs:spotbugs-annotations:4.8.6' // required by flutter_secure_storage

Replace the version codes with the most recent ones you find in the links above.

And don't forget to remove the incorrect -dontwarn lines from your proguard-rules.pro.

[DyoungDsea]

For anyone caring about this issue: it is a really, really bad workaround to suppress all errors with -dontwarn.

This error, which was a compile warning before AGP 8.0, has now been elevated to a compile error. Essentially, it is trying to tell you that some classes referenced in your project cannot be found.

In some cases, you can still ignore it completely using -dontwarn like you did before AGP 8.0; however, in most cases, you should find the missing classes rather than suppressing the error to avoid ignoring the underlying issues.

Let's take a look at the missing classes in this issue:

For com.google.errorprone.annotations.*, it's clear that it is part of the error_prone_annotations package.

For javax.annotation.Nullable, it is actually part of the optional feature called JSR 305. The most "popular" implementation available atm is spotbugs-annotations.

So the solution is clear:

(Real) Workaround

Add these lines to your android/app/build.gradle's dependencies section:

implementation 'com.google.errorprone:error_prone_annotations:2.36.0' // required by flutter_secure_storage
implementation 'com.github.spotbugs:spotbugs-annotations:4.8.6' // required by flutter_secure_storage

Replace the version codes with the most recent ones you find in the links above.

dependencies { implementation 'com.google.errorprone:error_prone_annotations:2.36.0' implementation 'com.github.spotbugs:spotbugs-annotations:4.8.6' }

[MartemyanovAleksandr]

For anyone caring about this issue: it is a really, really bad workaround to suppress all errors with -dontwarn.

This error, which was a compile warning before AGP 8.0, has now been elevated to a compile error. Essentially, it is trying to tell you that some classes referenced in your project cannot be found.

In some cases, you can still ignore it completely using -dontwarn like you did before AGP 8.0; however, in most cases, you should find the missing classes rather than suppressing the error to avoid ignoring the underlying issues.

Let's take a look at the missing classes in this issue:

For com.google.errorprone.annotations.*, it's clear that it is part of the error_prone_annotations package.

For javax.annotation.Nullable, it is actually part of the optional feature called JSR 305. The most "popular" implementation available atm is spotbugs-annotations.

So the solution is clear:

(Real) Workaround

Add these lines to your android/app/build.gradle's dependencies section:

implementation 'com.google.errorprone:error_prone_annotations:2.36.0' // required by flutter_secure_storage
implementation 'com.github.spotbugs:spotbugs-annotations:4.8.6' // required by flutter_secure_storage

Replace the version codes with the most recent ones you find in the links above.

It's realy works for me. Thank you very much!

[juliansteenbakker]

This problem is probably fixed with version v10.0.0-beta.1. If you still encounter it with this version, please let me know.

[AhmedLSayed9]

@juliansteenbakker I still have the issue with flutter_secure_storage v10.0.0-beta.2 and Flutter v3.24.3.

Adding the following to android/app/build.gradle's dependencies fixes it:

// This is a temporary fix for https://github.com/mogol/flutter_secure_storage/issues/748
implementation 'org.slf4j:slf4j-api:2.0.16'

[juliansteenbakker]

Could you please check if this version compiles correctly in release mode:

  flutter_secure_storage:
    git:
      url: https://github.com/juliansteenbakker/flutter_secure_storage
      ref: fix/release-build
      path: flutter_secure_storage/

[juliansteenbakker]

I have merged this fix.

[AhmedLSayed9]

@juliansteenbakker I've tested it again using flutter_secure_storage v10.0.0-beta.2 and somehow it's working now. I can't find the reason though. Maybe, because I've downgraded the Java version used by Flutter (Downgraded from v21 to v19). Thanks anyway!

[unknownaloy]

A fix for this is available on version flutter_secure_storage 9.2.4

You can also read the changelog doc to confirm here -> https://pub.dev/packages/flutter_secure_storage/changelog