Re: Serialization problem

I'm writing an object to a file using serialisation. I based it on an
example from the net

    public void writeMyObject(){
        FileOutputStream fos = null;
        ObjectOutputStream out = null;
        try
        {
            fos = new FileOutputStream("test.dat");
            out = new ObjectOutputStream(fos);
            out.writeObject(myObject);
            out.close();
            System.out.println("Object Persisted");
        }
        catch(IOException ex)
        {
            ex.printStackTrace();

        }

myObject class has implements Serializable in its declaration.
What happens is I get a IOException when executing
out.writeObject(myObject);
What may cause this ?, and are there any further tests I can do to find out
the problem ?

Btw the file is created, but not closed properly.