Error JAVA0000 - Type androidx.collection.ArraySetKt is defined multiple times

Question

When trying to rebuild app I am migrating from Xamarin.android to MAUI, I am getting the following error.

It is not actually in the solution path, it is in the c drive under nuget\packages.

I dont know if this is important, but I noticed in the error, one path ends in: net7.0-android33.0 The other path ends in: net6.0-android31.0

Error JAVA0000

Error in C:\Users\asbissada\.nuget\packages\xamarin.androidx.collection.jvm\1.3.0.2\buildTransitive\net7.0-android33.0\..\..\jar\androidx.collection.collection-jvm.jar:androidx/collection/ArraySetKt.class:

Type androidx.collection.ArraySetKt is defined multiple times:

C:\Users\asbissada\.nuget\packages\xamarin.androidx.collection.jvm\1.3.0.2\buildTransitive\net7.0-android33.0\..\..\jar\androidx.collection.collection-jvm.jar:androidx/collection/ArraySetKt.class
C:\Users\asbissada\.nuget\packages\xamarin.androidx.collection.ktx\1.2.0.10\buildTransitive\net6.0-android31.0\..\..\jar\androidx.collection.collection-ktx.jar:androidx/collection/ArraySetKt.class

Compilation failed.

I see other JAVA0000 on SO but haven't seen this one. This is what the AndroidX packages look like (I don't see ArraySetKt in there). Although I do notice Xamarin.AndroidX.Lifecycle.Common has a warning symbol even though its on the latest version:

camionkraken · Accepted Answer · 2024-02-06 16:09:45Z

43

Try adding these nuget packages as Android dependencies:

Xamarin.AndroidX.Collection

Xamarin.AndroidX.Collection.Ktx

answered Feb 6, 2024 at 16:09

camionkraken

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7 Comments

tonyedwardspz Over a year ago

Thanks for this! You saved me a whole bunch of time.

camionkraken Over a year ago

@wallef Honestly, i didn't fully understand it. It has something to do with original Google libraries dependencies and their .NET bindings, which have to keep the same dependencies and if they're not completely up-to-date can cause some troubles.

Amir Hajiha Over a year ago

How about this error? Type androidx.lifecycle.DispatchQueue is defined multiple times

Ken Pespisa Over a year ago

I had to also add Xamarin.AndroidX.Activity and Xamarin.AndroidX.Activity.Ktx

MC9000 Over a year ago

I thought MAUI used the jvm and MS recommended it over Kotlin. This is so confusing

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SuperQuinho · Accepted Answer · 2025-08-26 05:09:21Z

0

For me adding the NuGet Package "Xamarin.AndroidX.Fragment.Ktx" solved the issue

answered Aug 26 at 5:09

SuperQuinho

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