actually, I don't know, I'm trying to find out, but it lacks of docs
about it on the internet...
This issue must have been discussed...

Thank you all, for your replies :)
Well, yes. "it" refered to serialization applied to SWT object.
Indeed, SWT object are not "atomic" structure which enables a
serialization process.
Maybe a SWT serialization process will be implemented in the future.
Anyway, serializing widget such as a tree could allow me to factorize
data into a whole widget instead of serializing many attributes of
given classes..
So the workaround will be a simpler serialization of ArrayList or
stuffs like that :)

regards.

Red Orchid a ?crit :

This is not true! The serialization process has no problems with these
type of constructors. The parent is just another reference and as long
as this reference is Serializable the serializer has no problems with
it. See test below. More reasonable is that due to the fact an Widget
is bound to a certain Device/Display it would make it hard to serialize
and deserialize these two since they are directly connected to
Hardware.

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        try {
            Parent p = new Parent();
            ByteArrayOutputStream boas = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(boas);
            oos.writeObject(p);
            oos.flush();
            oos.close();
            System.out.println("no Exception occured");

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    static class Parent implements Serializable {
        public final Child child;

        public Parent()  {
            child = new Child(this);
        }

    }

    static class Child implements Serializable {
        public final Parent parent;
       
        public Child(Parent parent) {
            this.parent = parent;
        }
    }
}