Fail to display data as ListView from Firebase

Question

My goal is just to retrieve data from Firebase and then output it as ListView in Android (No need to push anything back to the database). I tried to learn from the AndroidChat example and created my own class and my own Custom List Adapter class instead of Chat.java and ChatListAdapter.java (as in the orignal example). I also changed the references to my Firebase and resemble my data structure to that of https://android-chat.firebaseio-demo.com/. Below is my data structure: (Everything below is just the same as the AndroidChat example, just different variable names)

My own class:

package com.firebase.androidchat;


public class MenuItem {

    private String food;
    private String weekDay;

    // Required default constructor for Firebase object mapping
    @SuppressWarnings("unused")
    private MenuItem() { }

    MenuItem(String food, String weekDay) {
        this.food = food;
        this.weekDay = weekDay;
    }

    public String getFood() {
        return food;
    }

    public String getWeekDay() {
        return weekDay;
    }
}

My own custom list adapter class:

package com.firebase.androidchat;

import android.app.Activity;
import android.view.View;
import android.widget.TextView;
import com.firebase.client.Query;

public class MenuListAdapter extends FirebaseListAdapter<MenuItem> {

    public MenuListAdapter(Query ref, Activity activity, int layout) {
        super(ref, MenuItem.class, layout, activity);
    }

    @Override
    protected void populateView(View view, MenuItem item) {
        // Map a MenuItem object to an entry in our listview
        String weekDay = item.getWeekDay();
        TextView authorText = (TextView)view.findViewById(R.id.author);
        authorText.setText(weekDay + ": ");
        ((TextView)view.findViewById(R.id.message)).setText(item.getFood());
    }
}

My MainActivity in brief:

public class MainActivity extends ListActivity {

    // TODO: change this to your own Firebase URL
    private static final String FIREBASE_URL = "https://barlaurea.firebaseio.com/";

    private Firebase ref;
    private ValueEventListener connectedListener;
    private MenuListAdapter menuListAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);       
        // Setup our Firebase ref
        ref = new Firebase(FIREBASE_URL).child("menu");
    }

    @Override
    public void onStart() {
        super.onStart();
        // Setup our view and list adapter. Ensure it scrolls to the bottom as data changes
        final ListView listView = getListView();
        // Tell our list adapter that we only want 50 messages at a time
        menuListAdapter = new MenuListAdapter(ref.limit(50), this, R.layout.chat_message);
        listView.setAdapter(menuListAdapter);

        menuListAdapter.registerDataSetObserver(new DataSetObserver() {
            @Override
            public void onChanged() {
                super.onChanged();
                listView.setSelection(menuListAdapter.getCount() - 1);
            }
        });

When I started the Run button, my device displayed a toast message "Connected to Firebase" but the screen remained blank and then crashed after a few seconds, showing a toast "Unfortunately, Firebase Chat has stopped". What did I miss here? Thank you!

Edit: Here is my LogCat view: Everything turn red at the "FAIL EXCEPTION: main line" Also the original AndroidChat run fine on my device..

02-07 16:17:35.105: D/dalvikvm(31766): GC_CONCURRENT freed 313K, 16% free 7795K/9223K, paused 14ms+16ms, total 65ms
02-07 16:17:36.000: D/dalvikvm(31766): GC_CONCURRENT freed 494K, 17% free 7874K/9479K, paused 2ms+3ms, total 34ms
02-07 16:17:36.365: D/dalvikvm(31766): GC_CONCURRENT freed 482K, 17% free 7923K/9543K, paused 19ms+21ms, total 142ms
02-07 16:17:36.495: D/AndroidRuntime(31766): Shutting down VM
02-07 16:17:36.495: W/dalvikvm(31766): threadid=1: thread exiting with uncaught exception (group=0x41fb02a0)
02-07 16:17:36.520: E/AndroidRuntime(31766): FATAL EXCEPTION: main
02-07 16:17:36.520: E/AndroidRuntime(31766): com.firebase.client.FirebaseException: Failed to bounce to type
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:185)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.androidchat.FirebaseListAdapter$1.onChildAdded(FirebaseListAdapter.java:63)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.client.core.ChildListenerContainer$1.run(ChildListenerContainer.java:52)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.os.Handler.handleCallback(Handler.java:615)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.os.Looper.loop(Looper.java:137)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.app.ActivityThread.main(ActivityThread.java:4947)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at java.lang.reflect.Method.invokeNative(Native Method)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at java.lang.reflect.Method.invoke(Method.java:511)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at dalvik.system.NativeStart.main(Native Method)
02-07 16:17:36.520: E/AndroidRuntime(31766): Caused by: com.shaded.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "weekday" (class com.firebase.androidchat.MenuItem), not marked as ignorable (2 known properties: , "weekDay", "food"])
02-07 16:17:36.520: E/AndroidRuntime(31766):  at [Source: java.io.StringReader@42826fc8; line: 1, column: 13] (through reference chain: com.firebase.androidchat.MenuItem["weekday"])
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:555)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:708)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1160)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:315)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:181)
02-07 16:17:36.520: E/AndroidRuntime(31766):    ... 11 more

Answer 1

The answer has been found here:

Firebase's AndroidChat example: Failed to bounce to type

In this case I should have typed weekDay not weekday in the firebase instance.