Proguard Missing classes detected while running R8 after adding package names in proguard-rules.pro

Question

AGPBI gives this as output:

> Task :app:minifyReleaseWithR8
AGPBI: {"kind":"warning","text":"Unexpected reference to missing service class: META-INF/services/reactor.blockhound.integration.BlockHoundIntegration.","sources":[{"file":"/app/build/intermediates/merged_java_res/release/base.jar"}],"tool":"R8"}

AGPBI: {"kind":"warning","text":"Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /app/build/outputs/mapping/release/missing_rules.txt.\n","sources":[{}]}

AGPBI: {"kind":"warning","text":"Missing class com.aayushatharva.brotli4j.Brotli4jLoader (referenced from: void io.netty.handler.codec.compression.Brotli.<clinit>() and 2 other contexts)\n

Missing class com.aayushatharva.brotli4j.decoder.DecoderJNI$Status (referenced from: void io.netty.handler.codec.compression.BrotliDecoder$1.<clinit>() and 1 other context)\n
Missing class com.aayushatharva.brotli4j.decoder.DecoderJNI$Wrapper (referenced from: com.aayushatharva.brotli4j.decoder.DecoderJNI$Wrapper io.netty.handler.codec.compression.BrotliDecoder.decoder and 4 other contexts)\n
Missing class com.aayushatharva.brotli4j.encoder.Encoder$Mode (referenced from: void io.netty.handler.codec.compression.BrotliOptions.<clinit>())\n
Missing class com.aayushatharva.brotli4j.encoder.Encoder$Parameters (referenced from: com.aayushatharva.brotli4j.encoder.Encoder$Parameters io.netty.handler.codec.compression.BrotliEncoder.parameters and 7 other contexts)\n
Missing class com.aayushatharva.brotli4j.encoder.Encoder (referenced from: io.netty.buffer.ByteBuf io.netty.handler.codec.compression.BrotliEncoder.allocateBuffer(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, boolean))\n
Missing class com.android.org.conscrypt.SSLParametersImpl (referenced from: void org.conscrypt.KitKatPlatformOpenSSLSocketImplAdapter.<init>(org.conscrypt.AbstractConscryptSocket))\n
Missing class com.github.luben.zstd.Zstd (referenced from: io.netty.buffer.ByteBuf io.netty.handler.codec.compression.ZstdEncoder.allocateBuffer(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, boolean) and 1 other context)\n
Missing class com.google.protobuf.ExtensionRegistry (referenced from: void io.netty.handler.codec.protobuf.ProtobufDecoder.<init>(com.google.protobuf.MessageLite, com.google.protobuf.ExtensionRegistry))\n
Missing class com.google.protobuf.ExtensionRegistryLite (referenced from: com.google.protobuf.ExtensionRegistryLite io.netty.handler.codec.protobuf.ProtobufDecoder.extensionRegistry and 2 other contexts)\n

The missing files seem to be part of the bouncycastle library. Here is my proguard file:

-keep class org.spongycastle.** { *; }
-dontwarn org.spongycastle.**

# When I remove this, java.security.cert.CertificateException: X.509 not found is thrown
-keep class org.bouncycastle.** { *; }
-keep interface org.bouncycastle.**

# I got the missing classes from missing_rules.txt and added the package names that created the problem here:
-keep class org.conscrypt.** { *; }
-keep class io.netty.** { *; }

-keep class com.aayushatharva.** { *; }

-keep class ** { *; }

build.gradle (app):

implementation "org.conscrypt:conscrypt-android:$conscrypt"
implementation 'org.bouncycastle:bcprov-jdk15on:1.69'
implementation 'org.bouncycastle:bcpkix-jdk15on:1.69'

Why does it still gives the error while I add the correct missing package names?

Answer 1

Do this for flutter:

1. Open following path and copy the content

build\app\outputs\mapping\release\missing_rules.txt

2. Paste content into following file

android/app/proguard-rules.pro

With this the build is working fine for me

Answer 2

After long time trouble, fix it by below steps.

Try to create build at machine level and find missing_rules.txt

build >> output >> mapping >> aapstoreliverelease (depend on what environment you selected) >> missing_rules.txt

Copy missiing rules and paste it into progaurd file and try to run.

It'll work.

In my case missing rules are below.

# Please add these rules to your existing keep rules in order to suppress warnings.
# This is generated automatically by the Android Gradle plugin.
-dontwarn org.apache.commons.lang.builder.ToStringBuilder
-dontwarn org.slf4j.impl.StaticLoggerBinder

Note :

1. Each one have different case so please try to find missing_rules.txt file of your project and do copy paste into progaurd.
2. Waste of time to use others rules mentioned here or available other's answer because it can work and can't. just a hit and try

hope it will work for you.

Answer 3

In my case (Flutter) the issue was: ERROR: R8: Missing class com.google.mlkit.vision.text.chinese.ChineseTextRecognizerOptions$Builder (referenced from: com.google.mlkit.vision.text.TextRecognizer com.google_mlkit_text_recognition.TextRecognizer.initialize(io.flutter.plugin.common.MethodCall))

The issue is fixed! I created the proguard-rules.pro file directly from Android Studio.

NOTE: the name of the file should looks "proguard-rules.pro" not like "proguard-rules.pro.txt" check how it looks in Android Studio.

Inside the ProGuard file, you need to specify which classes should be removed, like this:

-dontwarn com.google.mlkit.vision.text.chinese.** -assumenosideeffects class com.google.mlkit.vision.text.chinese.** { *; }

Answer 4

If the missing classes are present in your own Android library, then you can add the following to the libraries proguard.pro file:

-keep class packagename.classname

or simply

-keep class packagename.*

This will ensure that the minification of the library doesn't drop these classes that are used in the root project.

Answer 5

In my case inside of proguard-rules.pro file i add this line ,its solve my problem

-dontwarn com.google.android.play.core.**

you can open android\app\build\outputs\mapping\release\missing_rules.txt this file and then copy all and added all inside of proguard-rules.pro file

Answer 6

ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in D:\Project Name\build\app\outputs\mapping\release\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)

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

I faced the same issue while building apk and on my case fixed just by adding these two lines in my app/build.gradle above the line signingConfig = signingConfigs.debug:

minifyEnabled false
shrinkResources false

Answer 7

In my case the error was caused by smart_auth plugin. I had not added the plugin directly is was a transitive plugin (a plugin used by another plugin that you may have added). I found that pinput was the plugin that required smart_auth so I updated pinput to the latest version and then it got build.

Answer 8

• Create a file in app folder proguard-rules.pro

in this file write some code below-

 ## Flutter wrapper
 -keep class io.flutter.app.** { *; }
 -keep class io.flutter.plugin.** { *; }
 -keep class io.flutter.util.** { *; }
 -keep class io.flutter.view.** { *; }
 -keep class io.flutter.** { *; }
 -keep class io.flutter.plugins.** { *; }
 -keep class com.google.firebase.** { *; }
 -dontwarn io.flutter.embedding.**
 -ignorewarnings

Answer 9

Just add the following lines of code in the proguard-rules.pro and again build the signed apk or app bundle. It worked for me at last. find the missing classes accordingly and add '-dontwarn' followed by the class name.

-dontwarn com.android.org.conscrypt.SSLParametersImpl
-dontwarn org.apache.harmony.xnet.provider.jsse.SSLParametersImpl

Answer 10

Change minifyEnabled true to minifyEnabled false in build.gradle (app)

Answer 11

I upgrade gradle to 8.0 when i package my app I get the same problem.

this is the error message

Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in your path to missing_rules.txt

I follow the path to missing_rules.txt like this

app -> build -> outputs -> mapping -> your_app_name -> missing_rules.txt

I get those message

# Please add these rules to your existing keep rules in order to 
  suppress warnings.
# This is generated automatically by the Android Gradle plugin.
-dontwarn android.os.ServiceManager*
-dontwarn com.bun.miitmdid.core.MdidSdkHelper*
-dontwarn com.bun.miitmdid.interfaces.IIdentifierListener*
-dontwarn com.bun.miitmdid.interfaces.IdSupplier*
-dontwarn com.google.firebase.iid.FirebaseInstanceId*
-dontwarn com.google.firebase.iid.InstanceIdResult*
-dontwarn com.huawei.hms.ads.identifier.AdvertisingIdClient$Info*
-dontwarn com.huawei.hms.ads.identifier.AdvertisingIdClient*
-dontwarn com.tencent.android.tpush.otherpush.OtherPushClient*

I copy those messages into proguard-rules.pro then i fix this problem.

Answer 12

instead of suppressing it , you should find the missing class. for example if getting error related to annotations, please add following dependency to your app level build.gradle

//https://mvnrepository.com/artifact/com.google.errorprone/error_prone_annotations
implementation 'com.google.errorprone:error_prone_annotations:2.23.0'

this will add the missing class to your project and will remove error.

Answer 13

Copy the missing rules from the file android\app\build\outputs\mapping\release\missing_rules.txt and paste it in the android\app\proguard-rules.pro

Answer 14

Write the -dontwarn rules in the missing_rules.txt file into the proguard-rules file.

Answer 15

Just add -ignorewarnings to proguard-rules.pro as described in the Android 8 release notes.

Answer 16

You can disable minifyEnabled when debug the app since you are debugging the app on your phone but for the release version let minifyEnabled true ;

    buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        signingConfig signingConfigs.ProfileForsign
    }
    debug {
        signingConfig signingConfigs.ProfileForsign
        debuggable true
        minifyEnabled false
    }
}

Answer 17

Not directly OP's issue, but if you find R8 failing your builds about missing rules and you're using an older version of OkHttp, you can upgrade OkHttp to 4.11.0 for the necessary Proguard rules instead of adding them to your project.

Answer 18

1. Go to proguard-rules file (this file is available in Gradle Scripts)
2. add this rules in proguard-rules file

-dontwarn android.media.Spatializer$OnSpatializerStateChangedListener

-dontwarn android.media.Spatializer

Answer 19

These rules worked for me

-dontwarn com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite**

-keep,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation

Answer 20

Write the -dontwarn rules in the proguard-rules file

-dontwarn okhttp3.internal.platform.**
-dontwarn org.conscrypt.**
-dontwarn org.bouncycastle.**
-dontwarn org.openjsse.**

Answer 21

The missing classes warning tells that the mentioned classes are not present in the input (your source and dependencies) or in the referenced library (Android runtime library android.jar provided form the Platfrom SDK in this case). When R8 traces the program it will try to handle all the classes, methods and fields that it finds in the part of the program it considers live. Keeping all classes in a package will not change that. There are two options in this case:

1. Find the missing dependency and add it to the project
2. Ignore the warning using a -dontwarn as the class is expected to be missing.

For the warning on the class com.android.org.conscrypt.SSLParametersImpl adding a

-dontwarn com.android.org.conscrypt.SSLParametersImpl`

is the right thing to do, as looking at the source shows that the class extends a class which will be in the KitKat runtime, but not in the app (and also not in android.jar).

For the remaining warnings a similar decision has to be made.