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Welcome to B4X forum!
B4X is a set of simple and powerful cross platform RAD tools:
- B4A (free) - Android development
- B4J (free) - Desktop and Server development
- B4i - iOS development
- B4R (free) - Arduino, ESP8266 and ESP32 development
Search Results
B4A Example AppCompat with ToolBar - minimal example - Erel Jun 23, 2023 (23 reactions) tags: ToolBar, Android, drawer badge notification, AppCompat .NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor; The solution... B4A Question Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.arch.core.executor.ArchTaskExecutor" - Erel (first post) Sep 16, 2025 Please post the compilation window text.... B4A Question v10.7: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor; - Edson Freire Mar 18, 2021 .NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor;
at androidx....executor.ArchTaskExecutor" on path: DexPathListpackage.Name-3/base.apk"]... B4A Question B4XDrawer Error: Failed resolution of: LandroidX/arch/core/executor/archTaskExecutor - John Isaac F. Castillo (first post) Apr 16, 2021
Run this example: https://www.b4x.com/android/forum/threads/b4x-b4xpages-b4xdrawer.120246/#content
Does it work?
Which path is set... B4A Example Play Games Services - Example and Class - hanyelmehy (first post) Jul 30, 2025 when try
get java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor;
any idea... B4A Question App Force Closes on Launch - Erel (first post) May 28, 2024 (1 reaction) The way to solve such issues is:
1. Search google for: ArchTaskExecutor
2. Find this page: https://androidx.de/androidx/arch/core/executor/ArchTaskExecutor.html
3. 154087
4.
#AdditionalJar: androidx.arch.core:core-runtime... B4A Library [class] DocumentScanner based on Google ML Kit - asales (first post) Jul 17, 2025 (2 reactions) To run the example on B4A 13.40 and SDK 35: - need this line #AdditionalJar: androidx.arch.core:core-runtime - to avoid the error "java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor;"... B4A Question Firebase SignInWithGoogle - Xandoca (first post) May 3, 2023 (1 reaction) Maybe it helps
https://www.b4x.com/android/forum/threads/v10-7-java-lang-noclassdeffounderror-failed-resolution-of-landroidx-arch-core-executor-archtaskexecutor.128796/... B4A Question [Solved] Error with C̵a̵m̵e̵r̵a̵ MaterialDialogs in Beta 12 - Erel (first post) Nov 10, 2022 It is not a bug but rather an old library that needs to be updated to work with AndroidX SDK.
This error: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor; ?... B4A Question Biometric Issue with B4A 13.4 - BanditMrP (first post) Dec 16, 2025 Using USB Debug, I get this (this is the example app). I get exactly the same error with my app (it uses the same code). I'm going to completely uninstall and reinstall in new folders tonight to see if it fixes the issue. FATAL EXCEPTION: main Process: b4a.BIOM2, PID: 25284 java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor; at androidx....lang.ClassNotFoundException: androidx.arch.core.executor.ArchTaskExecutor ... 23 more ... Page: 1 2 3 |