IssueTracker

Stack trace:

12-13 10:45:18.610  6115  6115 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.r8bug/com.example.r8bug.MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.Map.clear()' on a null object reference
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:106)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:193)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:6669)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.Map.clear()' on a null object reference
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at com.flurry.sdk.aj.<init>(SourceFile:12)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at com.flurry.sdk.eu.a(SourceFile:1)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at com.example.r8bug.MainActivity.onCreate(SourceFile:77)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.Activity.performCreate(Activity.java:7136)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.Activity.performCreate(Activity.java:7127)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
12-13 10:45:18.610  6115  6115 E AndroidRuntime: 	... 11 more

Stack trace with horizontal class merging disabled in main (f74be29a69e8cd53a92b8d8687647ec9e51fc681):

12-13 10:59:32.474  6584  6584 W System.err: Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.Map.clear()' on a null object reference
12-13 10:59:32.474  6584  6584 W System.err: 	at com.flurry.sdk.eu.<init>(SourceFile:142)
12-13 10:59:32.474  6584  6584 W System.err: 	at com.flurry.sdk.eu.a(SourceFile:1)
12-13 10:59:32.474  6584  6584 W System.err: 	at com.example.r8bug.MainActivity.onCreate(SourceFile:77)
12-13 10:59:32.474  6584  6584 W System.err: 	at android.app.Activity.performCreate(Activity.java:7136)
12-13 10:59:32.474  6584  6584 W System.err: 	at android.app.Activity.performCreate(Activity.java:7127)
12-13 10:59:32.474  6584  6584 W System.err: 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
12-13 10:59:32.474  6584  6584 W System.err: 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
12-13 10:59:32.474  6584  6584 W System.err: 	... 11 more

The fix has been merged to the 8.2 release branch in 8.2.42, and you can use that version by merging the following into settings.gradle or settings.gradle.kts:

pluginManagement {
    buildscript {
        repositories {
            mavenCentral()
            maven {
                url = uri("https://storage.googleapis.com/r8-releases/raw")
            }
        }
        dependencies {
            classpath("com.android.tools:r8:8.2.42")
        }
    }
}

The fix is scheduled for the next patch release, so please remember to remove this use of a specific R8 version again when updating AGP to a version with the fix.

Thank you for your patience while our engineering team worked to resolve this issue. A fix for this issue is now available in:

• Android Studio Iguana | 2023.2.1 Beta 1
• Android Gradle Plugin 8.3.0-beta01

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

Thank you for taking the time to submit feedback — we really appreciate it!

The fixes for this issue are now also available in:

• Android Studio Hedgehog | 2023.1.1 Patch 1
• Android Gradle Plugin 8.2.1

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

We encountered similar issue. Tried R8 8.2.42 as suggested in this thread and the issue is gone, but the minifyReleaseWithR8 task became super slow. Haven't done any detailed measures yet but just looking at logs from our CI the minifyReleaseWithR8 takes:

AGP 8.0.2 -> ~6 minutes
AGP 8.2.0 -> Varies between runs but is usually worse than in 8.0.2, I've seen numbers in between ~ 10-15 minutes. In rare cases timeouts after 20minutes which is the limit we currently have on CI
AGP 8.2.0 with R8 8.2.42 -> Never completes within 20minutes timeout on our CI

Thanks for the feedback. It would be great if you could file a separate issue for that.

Looking over the commits that went in between R8 version 8.2.33 (AGP 8.2.0) and R8 version 8.2.42, it is not really clear that anyone should cause an additional build speed regression. Perhaps R8 8.2.40 due to Allow enums with subtypes without enum flag to be unboxed?

Would it be possible for you to share a zip dump of the compiler inputs (containing the app's JVM class files, keep rules, etc.)? That way we should be able to reproduce the issue. You can share the dump privately with christofferqa@google.com and sgjesse@google.com.

You can generate a dump like this:

./gradlew assembleRelease --no-daemon -Dcom.android.tools.r8.dumpinputtodirectory=/path/to/dumps

Alternatively, it would be great if you could share some timings from compiling using different R8 versions (e.g., 8.0.X, 8.1.75, 8.2.33, 8.2.43). You should be able to dump timing info by issuing the following command:

./gradlew assembleRelease --no-daemon -Dcom.android.tools.r8.printtimes -Dcom.android.tools.r8.printtimes.minvalue=0

You can build using a specific R8 version without changing the AGP version by making the following changes to settings.gradle.

pluginManagement {
    buildscript {
        repositories {
            mavenCentral()
            maven {
                url = uri("https://storage.googleapis.com/r8-releases/raw")
            }
        }
        dependencies {
            classpath("com.android.tools:r8:8.2.43")
        }
    }
}