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Room Persistence Library (dependency Issue), MVVM Design Pattern

Iam following MVVM tutorial and when adding Room dependency

1- I got this this error in compile:

Note: Failed to read get kotlin metadata for [Ljava.lang.Object;@54d771f9

Note: Failed to read get kotlin metadata for [Ljava.lang.Object;@4c00a268

Note: Failed to read get kotlin metadata for [Ljava.lang.Object;@42104314

Note: Failed to read get kotlin metadata for [Ljava.lang.Object;@203b72ad

2- also this: (SOLVED)

error: cannot find symbol class of

when adding this code in MainActivity:

public class MainActivity extends AppCompatActivity {
private NoteViewModel noteViewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //error is here in the ViewModelProviders.of
    noteViewModel = new ViewModelProviders.of(this).get(NoteViewModel.class);
    noteViewModel.getAllNotes().observe(this, notes -> {
        //update RecyclerView
        Toast.makeText(MainActivity.this, "onChanged", Toast.LENGTH_SHORT).show();
    });
 }
}
  • build.gradle(project):

    repositories {
     google()
     jcenter()
     maven { url "https://kotlin.bintray.com/kotlinx/" }
    }
    
    
    
    allprojects {
     repositories {
      google()
     jcenter()
     maven { url "https://kotlin.bintray.com/kotlinx/" }
     }
    }
    
  • build.gradle(app):

    room_version = "2.1.0-alpha06"
    
    implementation "androidx.room:room-runtime:$room_version"
    annotationProcessor "androidx.room:room-compiler:$room_version"
    
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Answer

remove new, this will work:

noteViewModel = ViewModelProviders.of(this).get(NoteViewModel.class);

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source: stackoverflow.com
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