Android Studio: "attempting to assign weaker access privileges" error on Room Database implementation

Question

I am trying to implement room database, I have gone through steps on Official Website, and 'AppDatabase.java' file is like this:

import android.content.Context;
import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;

@Database(entities = {User.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {

    public static AppDatabase instance;
    public static synchronized AppDatabase getInstance(Context context){
        if (instance==null){
            instance = Room.databaseBuilder(context.getApplicationContext(),
                    AppDatabase.class, "app_database").fallbackToDestructiveMigration().build();
        }
        return instance;
    }
}

And dependencies I have used for room:

    // Room Database
    def room_version = "2.4.2"

    implementation "androidx.room:room-runtime:$room_version"
    annotationProcessor "androidx.room:room-compiler:$room_version"

    // optional - RxJava2 support for Room
    implementation "androidx.room:room-rxjava2:$room_version"

    // optional - RxJava3 support for Room
    implementation "androidx.room:room-rxjava3:$room_version"

    // optional - Guava support for Room, including Optional and ListenableFuture
    implementation "androidx.room:room-guava:$room_version"

    // optional - Test helpers
    testImplementation "androidx.room:room-testing:$room_version"

    // optional - Paging 3 Integration
    implementation "androidx.room:room-paging:2.5.0-alpha02"

    // Room Database

It returns 2 errors here:

onCreate(SupportSQLiteDatabase) in <anonymous com.example.testdb1.room.AppDatabase_Impl$1> cannot override onCreate(SupportSQLiteDatabase) in Delegate
attempting to assign weaker access privileges; was public

onValidateSchema(SupportSQLiteDatabase) in <anonymous com.example.testdb1.room.AppDatabase_Impl$1> cannot override onValidateSchema(SupportSQLiteDatabase) in Delegate
attempting to assign weaker access privileges; was public

It was working before the 'Chipmunk' version (was working in 'Bumblebee'), but it started throwing these errors.

What is going on here?

Answer 1

I got this error because I used

implementation 'androidx.work:work-runtime-ktx:2.8.0-rc01'

with

implementation 'androidx.room:room-runtime:2.4.3'
kapt 'androidx.room:room-compiler:2.4.3'

and library

androidx.work:work-runtime-ktx:2.8.0-rc01

is dependent on

androidx.room:room-common:2.5.0-rc01

so I finished with two same libraries but with different versions

androidx.room:room-common:2.5.0-rc01
androidx.room:room-common:2.4.3

after switching back to

androidx.work:work-runtime:2.7.1

error was gone.