MAUI .NET 8 on Android - throwing an exception

Question

I have created a new MAUI .NET 8 project and migrated the Xamarin forms project code. When I tried to run the project with the Android device with Visual Studio Windows, which threw the exception below,

1>MSBUILD : java.exe error JAVA0000: Error in C:\Users\jeeva.nuget\packages\xamarin.androidx.collection.jvm\1.4.0.4\buildTransitive\net8.0-android34.0....\jar\androidx.collection.collection-jvm.jar:androidx/collection/ArrayMapKt.class: 1>MSBUILD : java.exe error JAVA0000: Type androidx.collection.ArrayMapKt is defined multiple times: C:\Users\jeeva.nuget\packages\xamarin.androidx.collection.jvm\1.4.0.4\buildTransitive\net8.0-android34.0....\jar\androidx.collection.collection-jvm.jar:androidx/collection/ArrayMapKt.class, C:\Users\jeeva.nuget\packages\xamarin.androidx.collection.ktx\1.2.0.9\buildTransitive\net6.0-android31.0....\jar\androidx.collection.collection-ktx.jar:androidx/collection/ArrayMapKt.class 1>MSBUILD : java.exe error JAVA0000: Compilation failed 1>MSBUILD : java.exe error JAVA0000: java.lang.RuntimeException: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: C:\Users\jeeva.nuget\packages\xamarin.androidx.collection.jvm\1.4.0.4\buildTransitive\net8.0-android34.0....\jar\androidx.collection.collection-jvm.jar 1>MSBUILD : java.exe error JAVA0000: androidx/collection/ArrayMapKt.class 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:135) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.D8.main(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:5) 1>MSBUILD : java.exe error JAVA0000: Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: C:\Users\jeeva.nuget\packages\xamarin.androidx.collection.jvm\1.4.0.4\buildTransitive\net8.0-android34.0....\jar\androidx.collection.collection-jvm.jar:androidx/collection/ArrayMapKt.class 1>MSBUILD : java.exe error JAVA0000: at Version.fakeStackEntry(Version_8.2.33.java:0) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.T.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:5) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:82) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:32) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:31) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.utils.S0.b(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:2) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.D8.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:42) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.D8.b(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:13) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.D8.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:40) 1>MSBUILD : java.exe error JAVA0000: at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:122) 1>MSBUILD : java.exe error JAVA0000: ... 1 more

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I have an in-app subscription in my project, and I used Xamarin.Android.Google.BillingClient package in migrated MAUI project.

<ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android'">

  <PackageReference Include="Xamarin.Android.Google.BillingClient" Version="6.2.1" />

</ItemGroup>

Does this package cause this exception? is there any solution to resolve this issue?

Answer 1

Hello,

Please add Xamarin.AndroidX.Fragment.Ktx and Xamarin.GooglePlayServices.Base in the <ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android'">, then rebuild your project.

<ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android'">

        <PackageReference Include="Xamarin.Android.Google.BillingClient">

          <Version>6.2.1</Version>

        </PackageReference>

          <PackageReference Include="Xamarin.AndroidX.Fragment.Ktx">

                  <Version>1.7.0.2</Version>

            </PackageReference>

          <PackageReference Include="Xamarin.GooglePlayServices.Base" Version="118.4.0" />

      </ItemGroup>

As note: My Microsoft.Maui.Controls and Microsoft.Maui.Controls.Compatibility version is 8.0.61

Best Regards,

Leon Lu

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