Android Question Failed resolution of: Landroidx/work/impl/WorkDatabase

Filippo · Aug 10, 2025

Hi,

despite using this Android code snippet, I still have the error in my app!
Is there anything else I can try?

Fatal Exception: java.lang.NoClassDefFoundError
Failed resolution of: Landroidx/tracing/Trace;

Fatal Exception: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/tracing/Trace;
at androidx.work.ConfigurationKt$createDefaultTracer$tracer$1.isEnabled(Configuration.kt:604)
at androidx.work.OperationKt.launchOperation$lambda$2$lambda$1(Operation.kt:72)
at androidx.work.OperationKt.$r8$lambda$XKAkIiEN7OgIvwuLUZRQpJhjmyE()
at androidx.work.OperationKt$$ExternalSyntheticLambda1.run(D8$$SyntheticClass)
at androidx.work.impl.utils.SerialExecutorImpl$Task.run(SerialExecutorImpl.java:96)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
at java.lang.Thread.run(Thread.java:1119)

Caused by java.lang.ClassNotFoundException
androidx.tracing.Trace

Caused by java.lang.ClassNotFoundException: androidx.tracing.Trace
at androidx.work.ConfigurationKt$createDefaultTracer$tracer$1.isEnabled(Configuration.kt:604)
at androidx.work.OperationKt.launchOperation$lambda$2$lambda$1(Operation.kt:72)
at androidx.work.OperationKt.$r8$lambda$XKAkIiEN7OgIvwuLUZRQpJhjmyE()
at androidx.work.OperationKt$$ExternalSyntheticLambda1.run(D8$$SyntheticClass)
at androidx.work.impl.utils.SerialExecutorImpl$Task.run(SerialExecutorImpl.java:96)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
at java.lang.Thread.run(Thread.java:1119)

Erel · Aug 11, 2025

This class belongs to androidx.tracing:tracing.

B4X:

#AdditionalJar: androidx.tracing:tracing

Which libraries are you using? I will add the missing dependency?

Filippo · Aug 11, 2025

Erel said:
Which libraries are you using? I will add the missing dependency?

Hi Erel,
That's all the app uses.

Erel · Aug 12, 2025

I've updated FirebaseAdMob2 and FirebaseAuth with this dependency.

Filippo · Aug 12, 2025

Erel said:
I've updated FirebaseAdMob2 and FirebaseAuth with this dependency.

Thank you very much, Erel!

Filippo · Aug 13, 2025

Hi,

unfortunately, other errors continue to occur.
After recompiling my app with the two new libraries “FirebaseAdMob2 and FirebaseAuth,” I now get this error:

Fatal Exception: java.lang.RuntimeException: Unable to create service com.google.firebase.iid.FirebaseInstanceIdService: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.iid.FirebaseInstanceIdService" on path: DexPathList[[zip file "/data/app/~~zmnDOyD1ROzjEiYDYspCiA==/fg.Solitario_free-sm6r4r3H78f5qPdfI4_jgA==/base.apk"],nativeLibraryDirectories=[/data/app/~~zmnDOyD1ROzjEiYDYspCiA==/fg.Solitario_free-sm6r4r3H78f5qPdfI4_jgA==/lib/x86_64, /system/lib64, /system_ext/lib64]]
at android.app.ActivityThread.handleCreateService(ActivityThread.java:4498)
at android.app.ActivityThread.-$$Nest$mhandleCreateService()
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2161)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7872)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Caused by java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.iid.FirebaseInstanceIdService" on path: DexPathList[[zip file "/data/app/~~zmnDOyD1ROzjEiYDYspCiA==/fg.Solitario_free-sm6r4r3H78f5qPdfI4_jgA==/base.apk"],nativeLibraryDirectories=[/data/app/~~zmnDOyD1ROzjEiYDYspCiA==/fg.Solitario_free-sm6r4r3H78f5qPdfI4_jgA==/lib/x86_64, /system/lib64, /system_ext/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:259)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.AppComponentFactory.instantiateService(AppComponentFactory.java:129)
at androidx.core.app.CoreComponentFactory.instantiateService(CoreComponentFactory.java:73)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:4467)
at android.app.ActivityThread.-$$Nest$mhandleCreateService()
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2161)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7872)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Erel · Aug 14, 2025

This one should be fixed with FirebaseAnalytics v3.21: https://www.b4x.com/android/forum/threads/firebaseanalytics.67708/post-1031026

Android Question Failed resolution of: Landroidx/work/impl/WorkDatabase

Filippo

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Erel

B4X founder

Filippo

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Erel

B4X founder

Filippo

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Filippo

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Erel

B4X founder

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