vavr-io/vavr

Strange behaviour, maybe an error when using peek on Android 5.1.1

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#2761 opened on Apr 3, 2024

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help wanted

Description

The following code runs fine on newer Android versions. However, I've encountered an issue on Android 5.1.1.

After an HTTP request is returned, attempting to use peek to retrieve either the data or an error response results in unexpected behavior.

My request looks like this:

public Either<Failure, Authenticated> executeRequest(Params params) {
// return Failure or Authenticated
}

I expect the result to be received in my view model. Here's a simplified example of the expected behavior:

myUseCase.execute(signIn).peek(
   failure -> {},
   result -> {}
);

Neither the failure nor the success callback is triggered in the view model. However, I observed the following log message:

Rejecting re-init on previously-failed class java.lang.Class<io.vavr.control.Either$$ExternalSyntheticLambda0>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.control.Either$$ExternalSyntheticLambda0>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.control.Either$$ExternalSyntheticLambda1>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.control.Either$$ExternalSyntheticLambda1>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.control.Either$$ExternalSyntheticLambda2>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.control.Either$$ExternalSyntheticLambda2>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.Function1>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.Function1>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.PartialFunction>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.PartialFunction>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Seq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Seq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.IndexedSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.IndexedSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Vector>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Vector>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.IndexedSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Array>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Array>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Array>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.IndexedSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.CharSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.CharSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.CharSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.PartialFunction>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Seq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.LinearSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.LinearSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.List>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.List>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.List>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.LinearSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Queue>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Queue>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Queue>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Map>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.SortedMap>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.LinearSeq>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Stream>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Stream>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Stream>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.List>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.List>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Vector>
Rejecting re-init on previously-failed class java.lang.Class<io.vavr.collection.Vector>
Rejecting re-init on previously-failed class java.lang.Class<com.mypackage.myapp.fragments.LoginFragmentViewModel$$ExternalSyntheticLambda1>

If I rewrite this using the following, it works:

Either<Failure, Authenticated> result = myUseCase.execute(signIn);

if(result.isLeft()) {
   Failure failure = result.getLeft();
} else {
   Authenticated authenticated = result.get();
}

Contributor guide

Tech stack
javaandroid
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JavaAndroid developmentVavr library
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the 'Rejecting re init on previously failed class' errors reported on Android 5.1.1. These errors suggest that Vavr's lambda synthetic classes (e.g., Either$$ExternalSyntheticLambda0) are failing to load on the older ART runtime. Look into whether the issue is caused by desugaring of lambdas or ProGuard/R8 optimization. Check the Vavr source code, specifically the peek method in Either.java and related functional interfaces. Consider testing with different desugar configurations or adding explicit proguard rules. Also review existing comments in the issue for any additional clues.