What is java.util.ConcurrentModificationException? [duplicate]

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What causes this exception? How can we prevent this exception? How to fix it?

Example:

I have an ArrayList where I keep several movies in a table (Jtable) where I remove the movies so I do not have them and I have a method to remove a movie from Arraylist, that is, from the table. When I remove a movie leaving a movie in the table, this exception does not occur, but when I remove a movie without having any movie in the table this exception occurs.

Method to remove movies: 

private void removeFilmeNaLista(){
        for (Iterator<Filme> it = listaFilmes.iterator(); it.hasNext();) {

            Filme i = it.next();

                 // aqui eu removo
                listaFilmes.remove(i);
                System.out.println("remove:" +(i));
                refazTabela();

        }
    }

Error: 

remove:model.Filme@16e0921
Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
    at java.util.ArrayList$Itr.next(ArrayList.java:851)
    at view.VideoLocacao.removeFilmeNaLista(VideoLocacao.java:495)
    at view.VideoLocacao.btnExcluirTbl2ActionPerformed(VideoLocacao.java:392)

The error appears from this line 495 where that is 'File i = it.next ();'.

    
asked by anonymous 21.09.2016 / 17:16

1 answer

1

I was able to resolve this exception by deleting the entire For loop and Filme i = it.next(); . 

private void removeFilmeNaLista() {

            listaFilmes.remove(filme);

            refazTabela();
    }
    
21.09.2016 / 21:20
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