[Bug] Duplicate Class Error when building Android on 7.1.0 Unity 2020.2.4f1

[tmfconan]

[REQUIRED] Please fill in the following fields:

• Unity editor version: 2020.2.4f1
• Firebase Unity SDK version: 7.1.0
• Source you installed the SDK: .unitypackage
• Problematic Firebase Component: Database
• Other Firebase Components in use: None, only Database
• Additional SDKs you are using: None
• Platform you are using the Unity editor on: Windows
• Platform you are targeting: Android
• Scripting Runtime: IL2CPP

[REQUIRED] Please describe the issue here:

Compiling for android fails, even with an empty project with only Database package installed. Console output doesn't directly point to firebase, but that's the only changing factor (empty project compiles fine without it).

I have enabled the custom gradle properties as mentioned in the settings and enabled Patch gradleTemplate.properties but that didn't help.

Steps to reproduce:

Created empty unity project. Installed Firebase Realtime Database package. Built for Android.

`
om.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives:
Type androidx.annotation.AnimRes is defined multiple times: E:\codes\TestProject\Temp\gradleOut\launcher\build\intermediates\external_file_lib_dex_archives\release\out\0_androidx.annotation.annotation-1.1.0.jar:classes.dex, E:\codes\TestProject\Temp\gradleOut\launcher\build\intermediates\external_file_lib_dex_archives\release\out\0_jetified-androidx.annotation.annotation-1.1.0.jar:classes.dex
Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.
at com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:132)
at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:119)
at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:102)
at com.android.build.gradle.internal.tasks.DexMergingTaskRunnable.run(DexMergingTask.kt:445)
at com.android.build.gradle.internal.tasks.Workers$ActionFacade.run(Workers.kt:348)
at org.gradle.workers.internal.AdapterWorkAction.execute(AdapterWorkAction.java:50)
at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:47)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1$1.create(NoIsolationWorkerFactory.java:65)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1$1.create(NoIsolationWorkerFactory.java:61)
at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:98)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.execute(NoIsolationWorkerFactory.java:61)
at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:56)
at org.gradle.workers.internal.DefaultWorkerExecutor$3.call(DefaultWorkerExecutor.java:215)
at org.gradle.workers.internal.DefaultWorkerExecutor$3.call(DefaultWorkerExecutor.java:210)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:215)
at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:164)
at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:131)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete
at com.android.tools.r8.utils.O.a(:65)
at com.android.tools.r8.D8.run(:11)
at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:117)
... 34 more
Caused by: com.android.tools.r8.utils.b: Error: E:\codes\TestProject\Temp\gradleOut\launcher\build\intermediates\external_file_lib_dex_archives\release\out\0_androidx.annotation.annotation-1.1.0.jar:classes.dex, Type androidx.annotation.AnimRes is defined multiple times: E:\codes\TestProject\Temp\gradleOut\launcher\build\intermediates\external_file_lib_dex_archives\release\out\0_androidx.annotation.annotation-1.1.0.jar:classes.dex, E:\codes\TestProject\Temp\gradleOut\launcher\build\intermediates\external_file_lib_dex_archives\release\out\0_jetified-androidx.annotation.annotation-1.1.0.jar:classes.dex
at com.android.tools.r8.utils.y0.a(:21)
at com.android.tools.r8.utils.x0.a(:30)
at com.android.tools.r8.utils.x0.a(:10)
at java.util.concurrent.ConcurrentHashMap.merge(ConcurrentHashMap.java:1990)
at com.android.tools.r8.utils.x0.a(:6)
at com.android.tools.r8.graph.A0$c.a(:6)
at com.android.tools.r8.dex.a.a(:85)
at com.android.tools.r8.dex.a.a(:12)
at com.android.tools.r8.D8.d(:6)
at com.android.tools.r8.D8.b(:1)
at com.android.tools.r8.utils.O.a(:30)
... 36 more

`

Relevant Code:

No code necessary.

[epicoro]

I have similar issue... I don't know why there are two version of jetified-guava included.. I am using Unity 2020.3.0f1 (Firestore, Auth, Analytics, Functions) 7.1.0

Duplicate class com.google.common.annotations.Beta found in modules jetified-guava-27.1-android.jar (guava-27.1-android.jar) and jetified-guava-28.1-android.jar (com.google.guava:guava:28.1-android)
Duplicate class com.google.common.annotations.GwtCompatible found in modules jetified-guava-27.1-android.jar (guava-27.1-android.jar) and jetified-guava-28.1-android.jar (com.google.guava:guava:28.1-android)
Duplicate class com.google.common.annotations.GwtIncompatible found in modules jetified-guava-27.1-android.jar (guava-27.1-android.jar) and jetified-guava-28.1-android.jar (com.google.guava:guava:28.1-android)
Duplicate class com.google.common.annotations.VisibleForTesting found in modules jetified-guava-27.1-android.jar (guava-27.1-android.jar) and jetified-guava-28.1-android.jar (com.google.guava:guava:28.1-android)
Duplicate class com.google.common.base.Absent found in modules jetified-guava-27.1-android.jar (guava-27.1-android.jar) and jetified-guava-28.1-android.jar (com.google.guava:guava:28.1-android)

--- it continues 500+

EDIT:
I have fixed the issue by deleting the jetified-guava-27.1 from libs folder. Firebase is working now!

[paulinon]

Hi @tmfconan,

Based on your error message, it appears that there's an error while merging dex archives. I found a community post that talks about your issue, and the most common solution here is to go to Player settings > Project Settings > Minify, and set Release to Gradle (Experimental).

If none of the solutions worked for you, I'd like you to provide a minimal, reproducible example of your project so that I can identify what's causing this behavior.

Thanks!

[tmfconan]

Thanks @paulinon,

Setting the minify to Released worked! What a thing. Thanks again.