#738 Error after adding Kotlin to existing Android app

[Emin Kokalari]

I have added in my app Kotlin support for existing app
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.10"
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1'

I have tried adding those proguard rules :

-dontwarn kotlin.
-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
-keepclassmembernames class kotlinx. { *; }
-assumenosideeffects class kotlin.jvm.internal.Intrinsics {
static void checkParameterIsNotNull(java.lang.Object, java.lang.String);
}

i have tried to remove those rules too, but everytime proguard throw exception :

Warning: Exception while processing task java.io.IOException: java.util.EmptyStackException
Thread(Tasks limiter_5): destruction

Task :app:transformClassesAndResourcesWithProguardForRelease FAILED

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
Job failed, see logs for detail

I am using latest proguard beta. Not using rxjava or any other starnge libraries.
Just android and kotlin

why i this happening ?

[Eric Lafortune]

With the gradle option --info --stacktrace, you should get more information about the crash. That may not be sufficient though. Do you have a small sample project that reproduces the issue?

[Emin Kokalari]

I don't know why but it is solved by using :

-dontwarn kotlin.
-keepclassmembernames class kotlin. { ; }
-assumenosideeffects class kotlin.jvm.internal.Intrinsics { static void checkParameterIsNotNull(java.lang.Object, java.lang.String); }
-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
-keepclassmembernames class kotlinx.* { volatile <fields>; }</fields>

if remove this line -keepclassmembernames class kotlin.* { ; } it will throw exception.
Kotlin doesn't say to use this config in official doc.

[Emin Kokalari]

This is the problem :

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> java.io.IOException: java.util.EmptyStackException

* Try:
Run with --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.accept(ExecuteActionsTaskExecuter.java:121)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.accept(ExecuteActionsTaskExecuter.java:117)
    at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:184)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:110)
    at org.gradle.api.internal.tasks.execution.ResolveIncrementalChangesTaskExecuter.execute(ResolveIncrementalChangesTaskExecuter.java:84)
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:91)
    at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionStateTaskExecuter.execute(ResolveBeforeExecutionStateTaskExecuter.java:74)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:109)
    at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionOutputsTaskExecuter.execute(ResolveBeforeExecutionOutputsTaskExecuter.java:67)
    at org.gradle.api.internal.tasks.execution.ResolveAfterPreviousExecutionStateTaskExecuter.execute(ResolveAfterPreviousExecutionStateTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:93)
    at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:45)
    at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:94)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:63)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:49)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:46)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:46)
    at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:355)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:134)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:129)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:202)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:193)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:129)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: java.lang.RuntimeException: java.io.IOException: java.util.EmptyStackException
    at com.android.builder.profile.Recorder$Block.handleException(Recorder.java:55)
    at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:107)
    at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:230)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:103)
    at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:73)
    at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:41)
    at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$4.run(ExecuteActionsTaskExecuter.java:338)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
    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.run(DefaultBuildOperationExecutor.java:92)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:327)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:312)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$200(ExecuteActionsTaskExecuter.java:75)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:158)
    at org.gradle.internal.execution.impl.steps.ExecuteStep.execute(ExecuteStep.java:46)
    at org.gradle.internal.execution.impl.steps.CancelExecutionStep.execute(CancelExecutionStep.java:34)
    at org.gradle.internal.execution.impl.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:69)
    at org.gradle.internal.execution.impl.steps.TimeoutStep.execute(TimeoutStep.java:49)
    at org.gradle.internal.execution.impl.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34)
    at org.gradle.internal.execution.impl.steps.CreateOutputsStep.execute(CreateOutputsStep.java:49)
    at org.gradle.internal.execution.impl.steps.SnapshotOutputStep.execute(SnapshotOutputStep.java:42)
    at org.gradle.internal.execution.impl.steps.SnapshotOutputStep.execute(SnapshotOutputStep.java:28)
    at org.gradle.internal.execution.impl.steps.CacheStep.executeWithoutCache(CacheStep.java:133)
    at org.gradle.internal.execution.impl.steps.CacheStep.lambda$execute$5(CacheStep.java:83)
    at org.gradle.internal.execution.impl.steps.CacheStep.execute(CacheStep.java:82)
    at org.gradle.internal.execution.impl.steps.CacheStep.execute(CacheStep.java:37)
    at org.gradle.internal.execution.impl.steps.PrepareCachingStep.execute(PrepareCachingStep.java:33)
    at org.gradle.internal.execution.impl.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:38)
    at org.gradle.internal.execution.impl.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:23)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:95)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:88)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:52)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:36)
    at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:34)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:109)
    ... 37 more
Caused by: java.io.IOException: java.util.EmptyStackException
    at com.android.build.gradle.internal.transforms.ProGuardTransform.doMinification(ProGuardTransform.java:261)
    at com.android.build.gradle.internal.transforms.ProGuardTransform.lambda$transform$0(ProGuardTransform.java:180)
    at com.android.build.gradle.internal.tasks.WorkLimiter.limit(WorkLimiter.kt:38)
    at com.android.build.gradle.internal.transforms.ProGuardTransform.transform(ProGuardTransform.java:178)
    at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:239)
    at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:235)
    at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:105)
    ... 75 more
Caused by: java.util.EmptyStackException
    at proguard.obfuscate.MappingPrinter.visitLineNumberTableAttribute(MappingPrinter.java:233)
    at proguard.classfile.attribute.LineNumberTableAttribute.accept(LineNumberTableAttribute.java:158)
    at proguard.classfile.attribute.CodeAttribute.attributesAccept(CodeAttribute.java:239)
    at proguard.obfuscate.MappingPrinter.visitCodeAttribute(MappingPrinter.java:136)
    at proguard.classfile.attribute.CodeAttribute.accept(CodeAttribute.java:141)
    at proguard.classfile.ProgramMethod.attributesAccept(ProgramMethod.java:101)
    at proguard.obfuscate.MappingPrinter.visitProgramMethod(MappingPrinter.java:114)
    at proguard.classfile.ProgramMethod.accept(ProgramMethod.java:93)
    at proguard.classfile.ProgramClass.methodsAccept(ProgramClass.java:588)
    at proguard.obfuscate.MappingPrinter.visitProgramClass(MappingPrinter.java:79)
    at proguard.classfile.ProgramClass.accept(ProgramClass.java:430)
    at proguard.classfile.ClassPool.classesAcceptAlphabetically(ClassPool.java:144)
    at proguard.obfuscate.Obfuscator.execute(Obfuscator.java:475)
    at proguard.ProGuard.obfuscate(ProGuard.java:456)
    at proguard.ProGuard.execute(ProGuard.java:187)
    at com.android.build.gradle.internal.transforms.BaseProguardAction.runProguard(BaseProguardAction.java:66)
    at com.android.build.gradle.internal.transforms.ProGuardTransform.doMinification(ProGuardTransform.java:255)
    ... 81 more

• Get more help at https://help.gradle.org

[Emin Kokalari]

I don't know why but the issue doesn't happen if add this rule :

-keepclassmembernames class kotlin.** { public <methods>; }

I am using :

implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1'

[Pascal Dal Farra]

FYI, I was using Proguard 6.0.3 on my Android java projects (no kotlin).

Then I updated some dependencies and Proguard 6.0.3 was hanging probably because of https://github.com/square/okio/issues/516 )

So I bumped to Proguard 6.1.1 and now I have this very same bug.

As Emin Kokalari, I added

-keepclassmembernames class kotlin.** { public <methods>; }

and the problem is now solved.

FYI, dependencies:

dependencies {
    implementation 'com.google.android.exoplayer:exoplayer:2.10.4'

    implementation 'com.google.code.gson:gson:2.8.5'

    implementation 'com.squareup.retrofit2:retrofit:2.6.1'
    implementation 'com.squareup.retrofit2:converter-gson:2.6.1'
    implementation 'com.squareup.retrofit2:converter-simplexml:2.6.1'
    implementation 'com.squareup.okhttp3:logging-interceptor:4.1.1'

}

Would this be okhttp / retrofit that causes this issue by bringing some kotlin in the game?
Possibly through this path up to okio and then kotlin? (version numbers are not correct/checked: I just copied this from another dependenciy tree)

+--- com.squareup.okhttp3:okhttp:3.11.0
|    \--- com.squareup.okio:okio:1.14.0 -> 2.1.0
|         \--- org.jetbrains.kotlin:kotlin-stdlib:1.2.60 -> 1.2.71
|              +--- org.jetbrains.kotlin:kotlin-stdlib-common:1.2.71
|              \--- org.jetbrains:annotations:13.0

[John Brewot]

Hello. Any news on this issue?
I'm still able to reproduce it on newest Kotlin 1.3.50 + Proguard 6.2.0 in Android project.
Also, usage of AspectJ leads to same problems.

Ignore Koltin classed is not an option for performance reason of our project.
There is a way to debug ProGuard someway to find where the issue exact.

Thanks.

[Jakub Broz]

We have the same issue with Kotlin 1.3.60 + proguard 6.2.0

[zyz36134]

This patch fixes the issue. We need check that stack is not empty like few lines above.

--- core/src/proguard/obfuscate/MappingPrinter.java
+++ core/src/proguard/obfuscate/MappingPrinter.java
@@ -230,7 +230,9 @@
{
// When exiting a top-level inlined block, the source might be null.
// See LineNumberLinearizer, line 185, exiting an inlined block.
- enclosingLineNumbers.pop();
+ if (!enclosingLineNumbers.isEmpty()) {
+ enclosingLineNumbers.pop();
+ }
}

But also seems that some logic is missed here and we should not receive such error.
I beleive that error occurs after inlined method lines printing was added in ProGuard 6.1.

[T. Neidhart]

This problem has been fixed and will be included in the upcoming release 6.2.1.