IssueTracker

It is not clear what version you are using, but I may believe that is a bug already fixed.

Could I ask you to try out a newer version by adding the following to your project level build.gradle:

buildscript {

    repositories {
        maven {
            url 'http://storage.googleapis.com/r8-releases/raw'
        }
    }

    dependencies {
        classpath 'com.android.tools:r8:1.5.45'          // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:X.Y.Z' // Your current AGP version.
     }
}

I have the same issue.
The newer version doesn't fix it.

I've tried 1.5.50 and it also doesn't fix the issue

Gradle
=======================
buildscript {
    ext.kotlin_version = '1.3.31'
    repositories {
        maven {
            url 'http://storage.googleapis.com/r8-releases/raw'
        }
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools:r8:1.5.50'          // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:3.4.1'
        classpath 'com.google.gms:google-services:4.2.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

Gradle properties:
===================
org.gradle.jvmargs=-Xmx3072m -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
org.gradle.parallel=true
org.gradle.configureondemand=true
android.enableBuildCache=true
org.gradle.caching=true
android.enableR8=true
android.useAndroidX=true
android.enableJetifier=true


Attached txt file with stack trace (gradlew transformClassesAndResourcesWithR8ForProdRelease --stacktrace)

Thank you

This is another error in the LambdaMerger where we see a direct method that is neither <clinit>, <init> or static. I will add some debugging to figure out what method that seems to be a problem.

korolev2009@, could I ask you to add the following to your project level build.gradle:

buildscript {

    repositories {
        maven {
            url "http://storage.googleapis.com/r8-releases/raw/master"
        }
    }

    dependencies {
        classpath 'com.android.tools:r8:9a31391e0bda5b9866730a4175fc6f37a8ca5fa1'  // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:X.Y.Z'     // Your current AGP version.
     }
}

This should ideally print out some information about the method that is causing the problem (you may have to use --info/--stacktrace to have gradle report stdout).

Thank you.
Attached

Ok, so this is the the debugging output:

Found method that is neither <clinit>, <init> or static
The method is: Encoded method Method com.permutive.android.event.EventPublisher$b.a Proto LL io.reactivex.Flowable kotlin.Pair
Access flags: private

The lambda class contains a private method (a) which we did not expect to find. It would be nice to see the original code for this. I have added the origin as additional output if you use:
buildscript {

    repositories {
        maven {
            url "http://storage.googleapis.com/r8-releases/raw/master"
        }
    }

    dependencies {
        classpath 'com.android.tools:r8:880545463e180d87753b638c83498f23c9f9cff0'  // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:X.Y.Z'     // Your current AGP version.
     }
}

When you find the origin it would be nice to either get the original source as well as the class file for the code if possible.

*Permutive is third part library

Ok, so I got this.
==========================
Found method that is neither <clinit>, <init> or static
The method is: Encoded method Method com.permutive.android.event.EventPublisher$b.a Proto LL io.reactivex.Flowable kotlin.Pair
Access flags: private
The class origin is: C:\Users\user-k\AndroidStudioProjects\myprojAndroid\myprojNews3\build\intermediates\transforms\FirebasePerformancePlugin\prod\re
lease\25\com\permutive\android\event\EventPublisher$b.class
===============

// IntelliJ API Decompiler stub source generated from a class file
// Implementation of methods is not available

package com.permutive.android.event

internal final class EventPublisher public constructor(api: com.permutive.android.event.api.EventApi, dao: com.permutive.android.event.db.EventDao, networkErrorHandler: com.permutive.android.network.NetworkErrorHandler, logger: com.permutive.android.common.Logger, configProvider: com.permutive.android.config.ConfigProvider) {
    private final val api: com.permutive.android.event.api.EventApi /* compiled code */

    private final val configProvider: com.permutive.android.config.ConfigProvider /* compiled code */

    private final val dao: com.permutive.android.event.db.EventDao /* compiled code */

    private final val logger: com.permutive.android.common.Logger /* compiled code */

    private final val networkErrorHandler: com.permutive.android.network.NetworkErrorHandler /* compiled code */

    private final fun processEventResponse(event: com.permutive.android.event.db.model.EventEntity, response: com.permutive.android.event.api.model.TrackBatchEventResponse): kotlin.Unit { /* compiled code */ }

    internal final fun publishEvents(): io.reactivex.Completable { /* compiled code */ }

    private final fun kotlin.Int.isClientError(): kotlin.Boolean { /* compiled code */ }

    private final fun kotlin.Int.isOk(): kotlin.Boolean { /* compiled code */ }

    private final fun kotlin.collections.List<com.permutive.android.event.db.model.EventEntity>.mapToTrackEventBodies(): kotlin.collections.List<com.permutive.android.event.api.model.TrackEventBody> { /* compiled code */ }
}

korolev2009@, thank you for the compiled class, I was able to make a reproduction and fix from it. Could I ask you to try out version 1.5.52 by adding the following to your top-level build.gradle file:

buildscript {

    repositories {
        maven {
            url 'http://storage.googleapis.com/r8-releases/raw'
        }
    }

    dependencies {
        classpath 'com.android.tools:r8:1.5.52'          // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:X.Y.Z' // Your current AGP version.
     }
}

With version 1.5.52 BUILD SUCCESSFUL :)

Mk, thank you!!!

Can we use it for production?

It has more bug-fixes in it than your current version, so yes go right ahead. The 1.5.XX branch is what we roll into android studio so it should be quite stable. Of course, if you find any other errors please do not hesitate to report them.