After migration to AndroidX, exception at start up: java.lang.ClassNotFoundException: “Didn't find class androidx.core.app.CoreComponentFactory”

Question

After migration to AndroidX i have the following exception at startup:

LoadedApk: Unable to instantiate appComponentFactory
    java.lang.ClassNotFoundExcept         


        

Answer 1

Looks CoreComponentFactory class is getting encrypted. Try adding the above class to proguard-rules.

 -keep class androidx.core.app.CoreComponentFactory { *; }

So the CoreComponentFactory won't be the encrypted anymore.

Answer 2

I hit this error while trying to run a debug android app on an AVD emulator.

Wiping the data from the emulator (from the AVD Manager) fixed the issue.

Answer 3

After reviewing an Android Issue Tracker bug report from this question, I saw a mention about multidex support. I had no multidex flags specified in my project, so I tried setting the flag to false on all modules in my project, and the exception went away.

This was not a permanent solution; the problem returned a few builds later.