Compiling Firestore with AGP 8.0 cause an R8 issue

[Lyokone]

[REQUIRED] Step 2: Describe your environment

• Android Studio version: 2022.2.1
• Firebase Component: Firestore
• Component version: 32.0.0

[REQUIRED] Step 3: Describe the problem

When trying to compile an application using Gradle 8.0 with Firestore I get the following issue:

ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in PATH/build/app/outputs/mapping/release/missing_rules.txt.
ERROR: R8: Missing class org.kxml2.io.KXmlParser,org.kxml2.io.KXmlSerializer (referenced from: java.lang.Iterable io.grpc.ServiceProviders.getCandidatesViaServiceLoader(java.lang.Class, java.lang.ClassLoader) and 1 other context)

Steps to reproduce:

Switch to AGP 8.0.

[dconeybe]

Hi @Lyokone. I'll take a look at this.

[Lyokone]

Thanks, doing more experiments around migrating all the example apps from FlutterFire, I found similar issues for

• Performance
  ERROR: R8: Missing class org.kxml2.io.KXmlParser,org.kxml2.io.KXmlSerializer (referenced from: java.util.List kotlinx.coroutines.internal.FastServiceLoader.load(java.lang.Class, java.lang.ClassLoader))
• Database
  ERROR: R8: Missing class org.kxml2.io.KXmlParser,org.kxml2.io.KXmlSerializer (referenced from: java.util.List kotlinx.coroutines.internal.FastServiceLoader.load(java.lang.Class, java.lang.ClassLoader))

[dconeybe]

I just tried a vanilla android project with agp8 and it worked just fine: https://github.com/dconeybe/agp8testapp
Can you try out that application? Just run ./gradlew assembleDebug

[Lyokone]

I've tried on your project and it works as expected in release and debug mode, with minifyEnabled true and shrinkResources true
Not sure why it wouldn't work on Flutter but at least I know where the problem is 😅

Thanks for your help, I think we can close this

[Lyokone]

For reference: after some more investigation, it seems that adding the

  integration_test:
    sdk: flutter

is what is causing the R8 errors. Till integration_test is not fully updated user should stay on 7.4.2.

[cuong0993]

Raised flutter/flutter#127388