Wsrtjtyk

I'm trying to retrieve data from Firebase database to add it to local database.

This code :

database = FirebaseDatabase.getInstance();

myRef = database.getReference();     

Query LANGUAGES_REF = myRef.child("languages").orderByChild("id");



LANGUAGES_REF.addChildEventListener(new ChildEventListener() {

                @Override

                public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {    

                if (dataSnapshot.hasChildren()) {

                Iterator<DataSnapshot> iterator = dataSnapshot.getChildren().iterator();

                       do {

                           Language language = iterator.next().getValue(Language.class);

                           languageR.insert(language);

                          } while (iterator.hasNext());

               }

is not working , and I know it's because Language.class is an entity.
Is there a way other than creating a new class with getters and setters and full constructor ... and repeating everything??

The error I got was:

com.google.firebase.database.DatabaseException: Can't convert object
of type java.lang.Long to type
com.android.android.Database.Entities.Language

at this line :

Language language = iterator.next().getValue(Language.class);

Thanks

edit:
firebase database structure

"languages" : {

    "LHZ7cAeOdPn-LwHNjIk" : {

        "id" : 1,

        "langName" : "Russian"

    },

    "LHZ7cAtXTGBlnWsdQOd" : {

        "id" : 2,

        "langName" : "French"

    },

    "LHZ7cAvrRs0rgI-PaJd" : {

        "id" : 3,

        "langName" : "Turkish"

    }

}

language.class

import java.io.Serializable;



import androidx.room.Entity;

import androidx.room.PrimaryKey;



@Entity

public class Language implements Serializable {



    @PrimaryKey(autoGenerate = true)

    private int id;



    private String langName;



    public int getId() {

        return id;

    }



    public String getLangName() {

        return langName;

    }



    public Language(String langName) {

        this.langName = langName;

    }



    public void setId(int id) {

        this.id = id;

    }

}

To solve this, you need to remove the do-while loop because there is no need to iterate using getChildren() method, you can get the data directly from the dataSnapshot object like this:

@Override

public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {

    Language language = dataSnapshot.getValue(Language.class);

    languageR.insert(language);

    Log.d(TAG, language.getLangName());

}

The output in your logcat will be:

Russian

French

Turkish