Duplicate class in Kotlin Android

Question

I kept on getting error that there is duplicate error in classes. This is what i have under org.jetbrains.kotlin folder .idea/libraries

it seems like the problem is because there is two different dependencies for the kotlin, from stdlib and stdlibjdk8 but I don't know how to remove either one from my module/project dependencies. Please help :(

Here's the full error code :

Duplicate class kotlin.collections.jdk8.CollectionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.internal.jdk7.JDK7PlatformImplementations found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.internal.jdk8.JDK8PlatformImplementations found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.io.path.ExperimentalPathApi found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.io.path.PathRelativizer found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.io.path.PathsKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.io.path.PathsKt__PathReadWriteKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.io.path.PathsKt__PathUtilsKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.jdk7.AutoCloseableKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0)
Duplicate class kotlin.jvm.jdk8.JvmRepeatableKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.random.jdk8.PlatformThreadLocalRandom found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.streams.jdk8.StreamsKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$1 found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$2 found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$3 found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$4 found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.text.jdk8.RegexExtensionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)
Duplicate class kotlin.time.jdk8.DurationConversionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0)

I've tried deleting the files from the org.jetbrains.kotlin but whenever i build the app in Android Studio, the files will be re-downloaded again.

this is my module app gradle code

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services'
}

android {
    compileSdk 33

    defaultConfig {
        applicationId "com.example.umfs"
        minSdk 21
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    buildFeatures {
        viewBinding true
    }

    namespace 'com.example.umfs'
}

dependencies {


    implementation 'androidx.appcompat:appcompat:1.5.1'
    implementation 'com.google.android.material:material:1.7.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'com.google.firebase:firebase-database:20.1.0'
    implementation 'androidx.preference:preference:1.2.0'
    implementation 'com.google.firebase:firebase-auth:21.1.0'
    implementation 'com.google.firebase:firebase-core:21.1.1'
    implementation 'androidx.navigation:navigation-fragment:2.5.3'
    implementation 'androidx.navigation:navigation-ui:2.5.3'
    implementation 'com.google.firebase:firebase-firestore:24.4.1'
    implementation 'androidx.recyclerview:recyclerview:1.2.1'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.0'
    implementation 'de.hdodenhof:circleimageview:3.1.0'
    implementation "androidx.cardview:cardview:1.0.0"
    implementation 'com.google.firebase:firebase-firestore:24.4.1'
    implementation 'com.google.firebase:firebase-storage:20.1.0'
    implementation 'com.google.firebase:firebase-database'
    implementation platform('com.google.firebase:firebase-bom:28.4.0')
    implementation 'com.squareup.picasso:picasso:2.71828'
    implementation 'com.makeramen:roundedimageview:2.3.0'
    implementation 'com.github.bumptech.glide:glide:4.14.2'
    implementation 'com.github.marlonlom:timeago:4.0.3'
    implementation "androidx.core:core-ktx:+"

}

apply plugin: 'com.google.gms.google-services'

Answer 1

Simply. For me just change this gradle plugins from 1.7.10 to 1.8.0 Then sync. => invalidate caches => build

From:

plugins {
....
id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
}

To:

plugins {
....
id 'org.jetbrains.kotlin.android' version '1.8.0' apply false
}

Answer 2

See this note in the official kotlin docs for an explanation of how alignment works with these dependencies and build flags. The below original answer is an alternative approach which doesn't take this into account.

This is because kotlin-stdlib-jdk7 and kotlin-stdlib-jdk8 are older dependencies that should be replaced by kotlin-stdlib (As @MrPNG pointed out from the what's new docs for kotlin 1.8). However, other libraries may still declare a dependency on them, which needs to be replaced with a dependency on kotlin-stdlib.

You can override how the jdk7 and jdk8 versions are resolved like this (in your app/build.gradle):

dependencies {
    constraints {
        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.0") {
            because("kotlin-stdlib-jdk7 is now a part of kotlin-stdlib")
        }
        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.0") {
            because("kotlin-stdlib-jdk8 is now a part of kotlin-stdlib")
        }
    }
}

The constraints section above can be added in alongside your other dependencies. Choose the version (here 1.8.0) to match the one you actually want to be used, which should be the one that your non-jdkN-named version is in the duplicate class error (e.g. (org.jetbrains.kotlin:kotlin-stdlib:1.8.0))

If you have apply plugin: 'kotlin-android' in this file, then it doesn't need to separately also say to depend on the stdlib in dependencies, so remove any lines that look like this:

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"

(thanks to this blog)

Answer 3

I have tried all the previous solutions but after adding the below code it was working.

dependencies {
   ... ... ...
   implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))
   ... ... ...
}

Answer 4

I was getting same error after upgrading android annotation libray from ver 1.4.0 to 1.6.0,

implementation 'androidx.annotation:annotation:1.6.0'

So I downgraded to 1.5.0 and error gone

implementation 'androidx.annotation:annotation:1.5.0'

Hope this helps you too

Answer 5

Upgrade kotlin android plugin and kotlin compiler

plugins {
    id 'org.jetbrains.kotlin.android' version '1.8.10'
}
android {
    composeOptions {
        kotlinCompilerExtensionVersion = "1.4.3"
    }
}

Answer 6

You can now update the lifecycle dependencies to the most up-to-date versions, and simply add the following line in your build.gradle

dependencies {

    (...)

    // Fix Duplicate class
    implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))

}

Answer 7

I tried many ways to solve this same prolem but didnt work I tried to add this dependencies below in my "build.gradle(module:app)"..

implementation (platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))

and then synce now, it will resolve this error.

Answer 8

I solved the problem by changing kotlin class path dependency in the root build.gradle file from

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.20-RC"

to

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.0"

Answer 9

I was using org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.10 before in our SDK and then I updated kotlin to v1.8.0 and that's when I started getting the above error in our Android Java front end application. Using org.jetbrains.kotlin:kotlin-bom resolved the issue with transitive dependencies and might be a cleaner approach since it doesn't leak Kotlin details into the Java application.

so I just replaced

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.10"

with below which solved the problem for me.

// Align versions of all Kotlin components
implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))
implementation "org.jetbrains.kotlin:kotlin-stdlib:1.8.0"

Answer 10

If you are using Compose you need to update the Compose Compiler (https://developer.android.com/jetpack/androidx/releases/compose-compiler) to 1.4.2 and Kotlin to 1.8.10 at the same time.

Answer 11

configurations.all {
    resolutionStrategy {
        force 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.10'
    }
}

adding this to the end of gradle file helps

Answer 12

I had the same error on my Kotlin project. When I add Ktor to my project and upgraded the library versions, and then I got the wired long error. This is how I fixed it.

I used compose version 1.4.0

ext {
    compose_ui_version = '1.4.0'
}

kotlin version 1.8.0, the latest one 1.8.10 not compatible with compose 1.4.0 So I used,

id 'org.jetbrains.kotlin.android' version '1.8.0' apply false

Then, adjust the composeOptions on app level build.gradle file, like

composeOptions {
    kotlinCompilerExtensionVersion '1.4.0'
}

These are the three changes that I have done and I got escaped from the wired error. Hope this will help someone.

Answer 13

lifecycle-viewmodel-ktx-2.6.1

down

lifecycle-viewmodel-ktx-2.5.1

I managed to get it working by lowering the dependency values.

Answer 14

I fixed it by making Compose Compiler and JetBrains Kotlin plugins compatible

First, make sure are you using org.jetbrains.kotlin.android plugin version above 1.8.0.

build.gradle(Project)

plugins {
  ...
  id 'org.jetbrains.kotlin.android' version '1.8.21' apply false
}

Then check compatible version of Compose Compiler from below link and update build.gradle(app):
https://developer.android.com/jetpack/androidx/releases/compose-kotlin#pre-release_kotlin_compatibility

android {
  ...
  composeOptions {
    kotlinCompilerExtensionVersion '1.4.7'
  }
}

Answer 15

In this problem solve when I add dependency in our bulid.gradle(app) file

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.0"

it's works properly

Answer 16

According to the release notes of Kotlin 1.8.0 (https://kotlinlang.org/docs/whatsnew18.html#updated-jvm-compilation-target), you shouldn't specify kotlin-stdlib-jdk7 nor kotlin-stdlib-jdk8 as dependencies anymore and, instead, just use kotlin-stdlib.

Answer 17

It is maybe some updated version dependency. In my new compose app, when i updated

implementation 'androidx.compose.material3:material3:*'(new version) from 1.0.0-alpha11

I will got this error. Try revert updated dependency.

Also I was getting this error when android studio add in my gradle modules ktx:+ dependency

Answer 18

I ran into this issue today and I fixed it by upgrading both Kotlin std-lib for android and the std-lib itself. Also it's worth mentioning that if you're using compose, you have upgrade the kotlinCompilerExtensionVersion

Here is the final setup

• gradle file at Module level

composeOptions {
    kotlinCompilerExtensionVersion '1.4.3'
}

• root project gradle file

plugins {
    id 'com.android.application' version '7.3.1' apply false
    id 'com.android.library' version '7.3.1' apply false
    id 'org.jetbrains.kotlin.android' version '1.8.10' apply false
    id 'org.jetbrains.kotlin.jvm' version '1.8.10' apply false
}

Answer 19

Workaround for earlier KGP versions now is:
*file app/build.gradle

dependencies {
constraints {
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.0") {
        because("kotlin-stdlib-jdk7 is now a part of kotlin-stdlib")
    }
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.0") {
        because("kotlin-stdlib-jdk8 is now a part of kotlin-stdlib")
    }
}

}

Answer 20

Step 1 :- Add this

plugins {
        id 'com.android.application'
        id 'org.jetbrains.kotlin.android' version '1.8.10' apply false
    }

Step 2 :- Add this on the dependencies

dependencies {

.....

  constraints{
        implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.10'
        implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.10'
    }
}

Note:- version '1.8.10', jdk7:1.8.10 and jdk7:1.8.10 are same...

Answer 21

edit app/build.gradle file in flutter

dependencies {

    (...)

    // Fix Duplicate class
    implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))

}

Answer 22

I had the same errors in my project. What finally helped me was the following steps

1-I have updated the buildScript: as below

buildscript {
    ext {
        compose_ui_version = '1.3.3'
    }
}
then change pluggin 
From

plugins {
....
id 'org.jetbrains.kotlin.android' version '1.7.10' apply false

}

To

plugins {
....
id 'org.jetbrains.kotlin.android' version '1.8.10' apply false
}

lastly updated in build.grade(app)

Change in android scope {}

    android {
    ......
    composeOptions {
            kotlinCompilerExtensionVersion '1.2.0'
        }
    .......
    }

To the following and the errors were gone

 composeOptions {
        kotlinCompilerExtensionVersion = "1.4.3"
    }

Hope it helps someone else 

Answer 23

kotlinCompilerExtensionVersion(compose) -> kotlin_version

1.4.4 -> 1.8.10

1.4.3 -> 1.8.10

1.4.2 -> 1.8.10

1.4.1 -> 1.8.0

1.4.0 -> 1.8.0

1.4.0-alpha02 -> 1.7.21

1.4.0-alpha01 -> 1.7.20

1.3.2 ->1.7.20

...

Other versions: https://developer.android.com/jetpack/androidx/releases/compose-kotlin

Answer 24

I'm getting similar error. These settings worked for me.

Note: I'm using Android Studio Flamingo | 2022.2.1

build.gradle(:project) settings

Old use:

buildscript {
    ext.kotlin_version = "1.7.20"
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:7.4.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
...

New use:

buildscript {
    ext.kotlin_version = "1.8.0"
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.0.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
...

build.gradle(:app) settings

Old use:

...
compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
...

New use:

...
compileOptions {
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }
    kotlinOptions {
        jvmTarget = '17'
    }
...

Gradle Projects Settings

Answer 25

This happened to me when upgrading one of these

implementation 'androidx.navigation:navigation-fragment:2.5.3'
implementation 'androidx.navigation:navigation-ui:2.5.3'

To version 2.6.0. When rolling back to 2.5.3 the error went away.

Answer 26

Adding this code inside app level/build.gradle

dependencies{
 ....
    constraints{
        implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.10'
        implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.10'
    }
}

and adding this code inside project level/build.gradle

dependencies {
    .....
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10"
}

It fixed this error 100%. It worked for me.

Answer 27

If I update kotlin version to 1.8.0 then it forces me to use view binding

i.e. classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.10'

then if you want to keep kotlin version as it was before then just add it in app level gradle-

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.0"

it will solve duplicate class issues though it is a temporary solution. Here my AGP version is 7.4.1 and Gradle version is 7.5

Answer 28

Update 2023

Recently, I had the same issue where most of the duplicate classes belonged to Kotlin. One of the errors was something like this:

Duplicate class kotlin.collections.jdk8.CollectionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.21 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.21)

I had this issue because I was using a buggy kotlin version. Upgrade your kotlin version to 1.8.0-Beta. Follow this:

in your android/build.gradle, first add this in the ext section:

kotlinVersion = "1.8.0-Beta"

Now, go down to the dependencies section and add this:

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"

Finally, make sure your JAVA_HOME points to a JDK11.

Doing these fixed my problem. Hope it helps!

Answer 29

Downgrade these deps to

implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.activity:activity-compose:1.5.1'

Answer 30

As I checked all ways, if there is a alpha version like this :

 implementation 'androidx.appcompat:appcompat:1.7.0-alpha02'

change it to

implementation 'androidx.appcompat:appcompat:1.6.1'

then Add class path in build.gradle()

 dependencies {
     
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.0"
...
    }

Answer 31

it is because of Compose Compiler Version and Kotlin Version incompability. when I posting this answer, most updated compatible versions were:

Compose Compiler Version: 1.4.6 Kotlin Version: 1.8.20

you can always find most updated compatible versions in this page: https://developer.android.com/jetpack/androidx/releases/compose-kotlin

you can set this versions in app level gradle file like this:

composeOptions {
    kotlinCompilerExtensionVersion = "1.4.3"
}

and

plugins {
    id 'org.jetbrains.kotlin.android' version '1.8.10'
}

Answer 32

I had the same exact issue after accepting Android Studio's suggestion to update certain dependencies.

I looked at all the solutions here but none applied in my case because... I am not using kotlin in my code anywhere (i.e. my development is all in pure Java).

That led me to finding the following line in build.gradle:

    implementation 'androidx.core:core-ktx:1.10.1'

I just deleted it and all built perfectly as before the updates.

I have no idea why my build.gradle had a reference to androidx.core:core-ktx:1.9.0 in the first place (before the upgrade).

Answer 33

for compose, use stable-version of material3

androidx.compose.material3:material3:1.0.1

and than

id 'org.jetbrains.kotlin.android' version '1.7.0' apply false

Answer 34

I noted the issue specifically after upgrading to these 2 libraries:

• Material3 version 1.1.0-alpha05

• Runtime-livedata version 1.4.0-beta01

This is are full dependencies:

implementation 'androidx.compose.runtime:runtime-livedata:1.4.0-beta01'
implementation 'androidx.compose.material3:material3:1.1.0-alpha04'

This is the error I was getting with Jdk-18.0.2

Duplicate class kotlin.collections.jdk8.CollectionsJDK8Kt found in modules kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and kotlin-stdlib-jdk8-1.7.20

The way around it for the time being is to downgrade these 2 libraries until the bug is corrected or updates are made.

implementation 'androidx.compose.material3:material3:1.1.0-alpha04'
implementation 'androidx.compose.runtime:runtime-livedata:1.4.0-alpha01'

Mind you there may be other dependencies that are affected and if you have recently upgraded the dependencies, you may need to rollback the updates and eliminate the library one by one to identify the troublesome one.

Answer 35

The accepted answer worked for me, but the Kotlin DSL syntax is:

kotlin("android").version("1.8.10").apply(false)

Answer 36

I first tried David Fraser's solution (constraints {...}) and it worked fine, but I found it strange and discarded it. Instead I changed the plugins as follows:

id 'org.jetbrains.kotlin.multiplatform' version '1.8.0' apply false // before 1.7.10

This also fixed the error.

Answer 37

Such problem occurred after upgrading jetpack compose from 1.3.0 to 1.4.0.

If you find this problem, please refer to the Kotlin Compose compatibility map in order to find matching Kotlin/Compose Compiler versions.

When you have found them, you need to make sure that:

• Gradle plugin has the right version (in buildSrc: build.gradle.kts for KTX gradle or in regular Gradle the root build.gradle one: implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:<KOTLIN_VERSION>"))
• Kotlin dependency has right version (if you use multi-module app and use Kotlin directly (implementation("org.jetbrains.kotlin:kotlin-stdlib:<KOTLIN_VERSION>"))
• kotlinCompilerExtensionVersion = <COMPOSE_VERSION> is matching

Answer 38

On my Mac. I hadn't worked on my app in a while 6-12 months maybe. I was just checking in to make sure that Android Studio and the dependencies weren't too out of date. I received the same error as noted in the question.

1. When I tried to change my ext.kotlin_version = "1.7.20" to 1.8.x, I received a warning about classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" being inconsistent with my Kotlin version.

2. When I went into Tools->Kotlin->Configure Kotlin Updates and noticed that I couldn't get the the recent 1.8.20 version.

3. Then went to see if I needed an Android Studio->Check for updates...

4. I in fact did need a major release update arctic fox to flamingo. After upgrading to Flamingo, I was able to update both locations of Kotlin Version to 1.8.20. Tools->Kotlin->Configure Kotlin Updates and ext.kotlin_version = "1.8.20"

5. Did File->Invalidate Cache and reboot

6. Did Build->Clean Project

7. I updated whatever else needed to be updated with Flamingo

8. Built and ran -> and ... BUILD SUCCESSFUL in 1m 6s 38 actionable tasks: 38 executed

Answer 39

(gradle.properties)

org.gradle.jvmargs=-Xmx4608m
android.useAndroidX=true
android.enableJetifier=true
android.enableR8=true

and app (build.gradle)

constraints {
        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.0") {
            because("kotlin-stdlib-jdk7 is now a part of kotlin-stdlib")
        }
        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.0") {
            because("kotlin-stdlib-jdk8 is now a part of kotlin-stdlib")
        }
    }

Answer 40

In my case, only changing the implementation 'androidx.core:core-ktx:1.10.1' to implementation 'androidx.core:core-ktx:1.7.0' worked for me.

Answer 41

I had the same problem after updating my Android Studio, for this to work, I had to downgrade my dependencies like this

Previous use:

dependencies {

    implementation 'androidx.core:core-ktx:1.10.1'
    implementation 'androidx.navigation:navigation-fragment-ktx:2.6.0'
    implementation 'androidx.navigation:navigation-ui-ktx:2.6.0'
}

Changing to:

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.navigation:navigation-fragment-ktx:2.5.3'
    implementation 'androidx.navigation:navigation-ui-ktx:2.5.3'
}

It worked for me.

Answer 42

I solved this problem and added this line in the build.gradle:

implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))

Answer 43

The issue may be easely fixed by one line only:

dependencies {
.....
    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.0'
}

Answer 44

Add the below line in your build.gradle(Module:app)

dependencies {

(...)

// Fix Duplicate class
implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))

}

Answer 45

I had same issue while it was working 2 days ago...

I changed to

composeOptions {
        kotlinCompilerExtensionVersion '1.3.2'
}

and id 'org.jetbrains.kotlin.android' version '1.7.20' apply false in build.gradle (Project)

Then clean and rebuild project.

Answer 46

I had the same error in my project but mine was caused by different jetpack compose libraries having different versions and I put the specific version number "1.3.3" which caused other libraries that have later version numbers to not be found. I fix this by using compose BOM which provides the latest version to each library

Answer 47

Replace this

implementation("androidx.navigation:navigation-compose:2.6.0-alpha06")

With

implementation("androidx.navigation:navigation-compose:2.6.0-alpha04")

Answer 48

Replace

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.20"

With

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.10"

And then If you used kotlin-android-extensions plugin, then remove this line. And use View binding to whole project.

Answer 49

Duplicate id detected is because there is a duplicate id you defined. For example, you defined the id in project level build.gradle file and if you define the same id in your module-level build.gradle file then it is simply a duplicate id problem.

Answer 50

If you are upgrading to 1.8.0 then you should add

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"

Answer 51

By @ArdaKazancı answer, I did a similar change: (agp:7.4.2, gradle: 7.5)

implementation 'androidx.recyclerview:recyclerview:1.3.1'
implementation 'androidx.core:core:1.10.0'

to

implementation 'androidx.recyclerview:recyclerview:1.2.1'
implementation 'androidx.core:core:1.9.0' 

Answer 52

This duplication happens because some of the libraries still use module org.jetbrains.kotlin:kotlin-stdlib-jdk8 or org.jetbrains.kotlin:kotlin-stdlib-jdk7 instead of the new module org.jetbrains.kotlin:kotlin-stdlib, therefore the class duplication accure.

To fix this we need to replace this module by ourselves:

modules {
        module('org.jetbrains.kotlin:kotlin-stdlib-jdk8')
                { replacedBy 'org.jetbrains.kotlin:kotlin-stdlib', 'kotlin fixes' }
        module('org.jetbrains.kotlin:kotlin-stdlib-jdk7')
                { replacedBy 'org.jetbrains.kotlin:kotlin-stdlib', 'kotlin fixes' }
    }

Answer 53

Change all lines in build.gradle to

 implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.8.0'
    implementation 'androidx.annotation:annotation:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.5.1'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'

I'd say downgrade the dependencies. I just do it and it works very well.