IssueTracker

Thank you for the report and for using library desugaring. However I was not able to reproduce this issue in a simple setting (see below). Do you have a reproduction that you can share, or can you maybe otherwise share the APK where this is failing at runtime? You can share it privately with sgjesse@google.com and zerny@google.com if works best for you. A few additional questions:

• What version of AGP and desugared library are you using (I tried to repro on AGP 4.0.0 with desugared library 1.0.5)?
• Can you share the exact runtime error and stack trace?
• Is this failing on all devices/emulators you have tested on?

For reproduction I added the following lines to onCreate of the main activity:

System.out.println(java.time.ZoneId.getAvailableZoneIds().size());
System.out.println(java.time.ZoneOffset.getAvailableZoneIds().size());

That resulted on two lines with 577 in logcat. Tested release mode on both an Android 10 (API 29) and KitKat (API 19) emulator.

The compiled code contained the two static calls:

...
invoke-static {}, Lj$/time/ZoneId;->getAvailableZoneIds()Ljava/util/Set;
...
invoke-static {}, Lj$/time/ZoneOffset;->getAvailableZoneIds()Ljava/util/Set;
...

and the keep rules for the desugared library contained:

-keep class j$.time.ZoneOffset {
    java.util.Set getAvailableZoneIds();
}
-keep class j$.time.ZoneId {
    java.util.Set getAvailableZoneIds();
}

and the desugared library DEX contained class j$.time.ZoneOffset extending j$.time.ZoneId.

Thanks you for the detailed information on how to reproduce that you have shared over email. Looking into it I feel pretty stupid, as the simple reproduction is to have only:

System.out.println(java.time.ZoneOffset.getAvailableZoneIds().size());

it the test app. That generates the keep rule

-keep class j$.time.ZoneOffset {
    java.util.Set getAvailableZoneIds();
}

Which not keep getAvailableZoneIds() on the super class j$.time.ZoneId causing the exception

java.lang.NoSuchMethodError: No static method getAvailableZoneIds()Ljava/util/Set; in class Lj$/time/ZoneOffset; or its super classes

This should now be fixed, and is included in R8 version 2.0.87 and above. You test it by adding the following to you top level build.gradle file:

buildscript {
    repositories {
        maven {
            url 'https://storage.googleapis.com/r8-releases/raw'
        }
    }
    dependencies {
        classpath 'com.android.tools:r8:2.0.87'          // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:4.0.0'
     }
}