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Fixed in 2022.1.X

Votes

0

Found in

2018.4

2019.4

2019.4.20f1

2020.3

2021.1

2021.2

Issue ID

1325245

Regression

No

[Android] Build fails with "launcher:checkReleaseDuplicateClasses" when using Kotlin plugins in your project

Mobile

-

Repro steps:
1. Open the project
2. Build for Android

Actual: Build fails
Expected: Build should succeed

Reproducible with: 2018.4.34f1, 2019.4.24f1, 2020.3.4f1, 2021.1.1f1, 2021.2.0a11

  1. Response avatar

    Resolution Note (fix version 2022.1):

    There are two issues here. One is that we use a rather old version of Kotlin which causes problems with Android Studio for the users project. Upgrading Kotlin version solves the problem.
    Another problem is the plugin itself used in the project. It uses a particular version of Kotlin and exposes it to the rest of the project, so if Gradle project generated by Unity uses different version of Kotlin, it results in conflict, while using the same version but including kotlin stdlib as "implementation" causes duplicate jar error. This should be solved by the user either by rebuilding the .aar plugin with different settings or using custom gradle templates that have exactly the same kotlin version and don't have "implementation" for kotlin stdlib, since that is already provided by the included .aar.

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