Android Question Exception java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/work/impl/WorkDatabase;

[sadegh nordeh]

Hello, dear Erel.

In Google Console, this error appeared

Exception java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/work/impl/WorkDatabase;
at androidx.work.impl.WorkManagerImpl.<init> (WorkManagerImpl.java:242)
at androidx.work.impl.WorkManagerImpl.<init> (WorkManagerImpl.java:217)
at androidx.work.impl.WorkManagerImpl.initialize (WorkManagerImpl.java:196)
at androidx.work.WorkManager.initialize (WorkManager.java:210)
at com.google.android.gms.ads.internal.util.WorkManagerUtil.zzb (com.google.android.gmslay-services-ads-lite@@23.2.0:1)
at com.google.android.gms.ads.internal.util.WorkManagerUtil.zze (com.google.android.gmslay-services-ads-lite@@23.2.0:2)
at com.google.android.gms.ads.internal.util.zzbs.zzdF (com.google.android.gmslay-services-ads-lite@@23.2.0:9)
at com.google.android.gms.internal.ads.zzbae.onTransact (com.google.android.gmslay-services-ads-base@@23.2.0:3)
at android.os.Binder.transact (Binder.java:1043)
at m.ana.bh com.google.android.gms.policy_ads_fdr_dynamite@250505305@250505301017.720652128.720652128:8)
at com.google.android.gms.ads.nonagon.offline.buffering.c.a com.google.android.gms.policy_ads_fdr_dynamite@250505305@250505301017.720652128.720652128:82)
at com.google.android.gms.ads.nonagon.offline.buffering.h.b com.google.android.gms.policy_ads_fdr_dynamite@250505305@250505301017.720652128.720652128:5)
at m.civ.run com.google.android.gms.policy_ads_fdr_dynamite@250505305@250505301017.720652128.720652128:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:641)
at java.lang.Thread.run (Thread.java:923)

And according to Google's own guidance

Gemini may display inaccurate information, so double-check its responses
Summary
The app is crashing because it cannot find a required class from the Android WorkManager library when initializing the WorkManager. This is evident from the java.lang.NoClassDefFoundError exception and the presence of androidx.work.impl.WorkManagerImpl in the stack trace. This class is a core part of how WorkManager schedules background tasks, and the Google Ads SDK is trying to use it in this instance. This type of error usually happens when a library or a part of it is not included in the final application package (APK).

Potential Solutions
Here are some potential solutions to address the NoClassDefFoundError crash related to the WorkManager library:

Verify and Correct WorkManager Dependency: The most likely cause of this crash is a missing or incorrect dependency declaration for the WorkManager library in your app's build.gradle file. Ensure that you have the correct dependency included. Here is an example of how the dependency should look:
dependencies {
implementation("androidx.work:work-runtime:2.8.1")
// ... other dependencies ...
}
Make sure to replace 2.8.1 with the specific WorkManager version compatible with your project. Also, ensure you are syncing your project with Gradle files after adding or modifying dependencies.

Investigate Code Shrinking and ProGuard Rules: If you are using code shrinking tools like R8 or ProGuard to reduce the size of your application, it is possible that these tools have mistakenly removed or obfuscated classes related to WorkManager. You can prevent this by adding specific rules to your ProGuard configuration file to keep the necessary WorkManager classes. Here are some example rules you can add to your proguard-rules.pro file:
-keep class androidx.work.** { *; }
-dontwarn androidx.work.**
These rules tell ProGuard to keep all classes within the androidx.work package and to suppress warnings related to them. Remember to clean and rebuild your project after modifying ProGuard rules.

Is it possible to set this

-keep class androidx.work.** { *; }
-dontwarn androidx.work.**

in Basic for ProGuard or Release Obfuscated or can I just add

#AdditionalJar: androidx.lifecycle:lifecycle-service
#AdditionalJar: androidx.work:work-runtime

to solve the problem?
Tanks @Erel

 

[Erel]

It is not related to ProGuard. B4A doesn't use it.

Try this: https://www.b4x.com/android/forum/t...dx_work_impl_workdatabase.165792/post-1016588