Note: Failed to read get kotlin metadata for [Ljava.lang.Object;@79d6c4df

I updated my Room depency to 2.1.0-alpha05 and got the same problem. Returning to 2.1.0-alpha04 solved mine.

implementation 'androidx.room:room-runtime:2.1.0-alpha04'
annotationProcessor 'androidx.room:room-compiler:2.1.0-alpha04'

UPDATE If you really want to use Room version 2.1.0-alpha05, add the following depency to your project repository:

maven { url 'https://kotlin.bintray.com/kotlinx/' }

Reference: AndroidX Room Release Notes

UPDATE I tried 2.1.0-alpha06.

implementation 'androidx.room:room-runtime:2.1.0-alpha06'
annotationProcessor 'androidx.room:room-compiler:2.1.0-alpha06'

Then I add the depency to my project repository,

maven { url 'https://kotlin.bintray.com/kotlinx/' }

There was na error but it compiled. I tested my app in real device for weeks and there wasn’t any issue running my app. My Room database is working fine.

I solved this issue by downgrading to:

implementation 'androidx.room:room-runtime:2.1.0-alpha04'
annotationProcessor 'androidx.room:room-compiler:2.1.0-alpha04'

Solved!

//Downgraded to alpha04.

implementation 'androidx.room:room-runtime:2.1.0-alpha04'
annotationProcessor 'androidx.room:room-compiler:2.1.0-alpha04'

// Other dependencies are..

implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0-alpha03'
implementation 'androidx.lifecycle:lifecycle-viewmodel:2.1.0-alpha03'
implementation 'androidx.lifecycle:lifecycle-livedata:2.1.0-alpha03'
annotationProcessor 'androidx.lifecycle:lifecycle-compiler:2.1.0-alpha03'

// Removed this from project level gradle.
maven { url "https://kotlin.bintray.com/kotlinx/" }

Don't forget to Clean & Rebuild the project after these changes