java.lang.ClassCastException - Same Object - Two classes, why?

Question

I'm working in the android Studio,2.1.2.

I have a mysterious cast Exception between two activity.

In the First Activity i have this ArrayList:

 ArrayList<riparazione> nuovo = notizia.get_Elenco();

I insert the arraylist ( parcellable ) in a bundle for send at another activity:

     Intent intent = new Intent(prenota_mostra_cellulari.this, prenota_mostra_dettagli.class);

                Bundle spedizione = new Bundle();
                    spedizione.putString("Nome",notizia.get_Marca());
                    spedizione.putString("Foto",notizia.get_Foto());
                    spedizione.putString("Marca",notizia.get_Nome());
                    spedizione.putParcelableArrayList("Riparazioni",nuovo);

                   intent.putExtras(spedizione);
                   intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

In second activity i use this for recover ArrayList

  ArrayList<riparazione> nuovo = new ArrayList<>();

    Intent intent = getIntent();
    if (null != intent) {
        dati_cel = intent.getExtras();
        nuovo = dati_cel.getParcelableArrayList("Riparazioni");

        Log.d("Dati", String.valueOf(dati_cel.size()));
        Log.d("Dati arraylist", String.valueOf(dati_cel.size()));
        riparazione dads = nuovo.get(9);
    }

NOW in line of riparazione dads = nuovo.get(9);

i get an Cast error :

Caused by: java.lang.ClassCastException: com.example.luca.ireplace.orario cannot be cast to com.example.luca.ireplace.riparazione

I have tried everything , with and without Bundle for sending, the class output end output are the same why this casting? And How do I solve??

Thanks for any Help

Looks like a class loader Problem. Same class on different classloader get this problem — Jens
– Jens, Commented Jul 29, 2016 at 11:01

Piotr Wilkin · Accepted Answer · 2016-07-29 11:05:34Z

1

The error is not in the code that you posted. Remember that Lists (and generics generally) suffer from type erasure. That means that even though you declared nuovo as ArrayList<riparazione>, Java will not check at runtime whether you are adding riparaziones to the list or whether the list actually contains riparaziones when you pass it.

You somehow inserted an orario into the list. The error occurs here:

riparazione dads = nuovo.get(9);

We have no idea how the nuovo list originally gets constructed, but the error is obviously not in the code that you posted.

answered Jul 29, 2016 at 11:05

Piotr Wilkin

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2 Comments

Luca Parlapiano Over a year ago

if i add a object riparazione : riparazione a1 = new riparazione(Strig a,String b, String c,String d) at nuovo. the adding is ok.

Piotr Wilkin Over a year ago

Yes, but somehow the nuovo list got an orario in it. I don't know how it got there, but it got there (that's what the error is telling you).

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