Question:

We are facing java.exe error when building application project in Xamarin.Android with latest version 6.9.3 after updating to support library 28.

Answer:

1. Install Visual Studio 2019 or latest version of Visual Studio for Mac
2. Open your project file (with extension .csproj) in a text editor

3. Add a new property group:

   <PropertyGroup>
     <DxExtraArguments>--dex --no-strict --force-jumbo</DxExtraArguments>
     <AndroidMultiDexClassListExtraArgs>--disable-annotation-resolution-workaround</AndroidMultiDexClassListExtraArgs>
   </PropertyGroup>

4. Fully clean and build your project