Re: Serialization problem

From:

"TonyB" <tonyb@kerrisway.freeserve.co.uk>

Newsgroups:

comp.lang.java.help

Date:

Mon, 26 Feb 2007 15:35:27 GMT

Message-ID:

<27DEh.28049$gM1.4773@fe04.news.easynews.com>

"Thomas Fritsch" <i.dont.like.spam@invalid.com> wrote in message
news:newscache$mfq2ej$9z8$1@news.ops.de...

TonyB schrieb:

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();

What output did you get here? Post the complete printed stack trace!

}

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 ?

Without the information contained the exception trace (see above) I can
only guess, but i don't want to.

Btw the file is created, but not closed properly.

Hi, I read the terminal output carefully and spotted that a class used in
myObject did not implement Serializable.
Now working great. I had mistakenly assumed that any class used within a
serializable class would also be serializable.
Thanks
Tony