Can't read multiple objects from a file

Question

I'm trying to put the (Lieu) objects into an ArrayList but but at the end of the code, my list is still empty. I've been looking on the net for an answer but all I find is "Write your objects in a collection then read the collection". But the file is already written and i need to find a way to put all the (Lieu) objects in a ArrayList.

Here's the writing Code (I can't modify it):

public static void main(String[] args) {
        Lieu<Double, String> p1;
        Lieu<Double, String> p2;
        Lieu<Double, String> p3;
        SegmentGeo<String> e1;
        SegmentGeo<String> e2;
        SegmentGeo<String> e3;
        Parcelle<String> p = new Parcelle<String>();
        ArrayList<Mesure<Point<Double>, String>> segs;
        p1 = new Lieu<Double, String>(45.573715, -73.900295, "p1");
        p2 = new Lieu<Double, String>(45.573882, -73.899748, "p2");
        p3 = new Lieu<Double, String>(45.574438, -73.900099, "p3");
        e1 = new SegmentGeo<String>(p1, p2, "Parcelle test");
        e2 = new SegmentGeo<String>(p2, p3, "Parcelle test");
        e3 = new SegmentGeo<String>(p3, p1, "Parcelle test");
        segs = new ArrayList<Mesure<Point<Double>, String>>();
        segs.add(e1);
        segs.add(e2);
        segs.add(e3);
        try {
            p.setMesures(segs);
        } catch (TrajectoireNonValideException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        ObjectOutputStream ois = null;
        try {
            ois = new ObjectOutputStream(new FileOutputStream("essai.txt"));
            ois.writeObject(p.informationCumulee());
            ois.writeObject(p1);
            ois.writeObject(p2);
            ois.writeObject(p3);
        } catch (EOFException ex) {
            System.out.println("Fin de fichier atteinte.");
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            try {
                if (ois != null) {
                    ois.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

And here's what I'm trying to do:

public void actionPerformed(ActionEvent arg0) {
    JFileChooser chooser = new JFileChooser();
    int retour = chooser.showOpenDialog(getParent());
    if(retour==JFileChooser.APPROVE_OPTION){
          try{
       FileInputStream fis = new FileInputStream(chooser.getSelectedFile().getName());
       ObjectInputStream ois = new ObjectInputStream(fis);
       champNom.setText((String) ois.readObject());//that's just to display the name
       while (ois.available()!=0) 
       { 
            temp = (Lieu)ois.readObject();
            l.add(temp);
       }
       ois.close();
       System.out.print(l.size());//The size is 0
       }
       catch (FileNotFoundException e) {
           e.printStackTrace();
       }
       catch (IOException e) {
           e.printStackTrace();
       } 
       catch (ClassNotFoundException e) {
           e.printStackTrace();
       }
     }

Answer 1

As Joetjah says, available() doesn't work like it sounds like.

One solution that is not super elegant but works surprisingly well is to just catch the Exceptions which will be thrown when there is nothing left to read or another exception, as such:

    try {
        while (true)
            l.add((Lieu<Double,String>)ois.readObject());
    } catch (ClassNotFoundException | IOException e) {
        //Expecting a EOFException here
    } finally {
        try {
            ois.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

Whenever there's an exception is thrown when reading (and at some point there will be one!), it will stop reading.