Re: serialization oddity in Alias

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From: Godmar Back (gback@cs.utah.edu)
Date: Wed Feb 10 1999 - 17:06:13 EST

Kaffe outputs a length of 106, JDK 1.1 of 108, but 1.2 outputs 106 like Kaffe.

        - Godmar

>
> Yup - that sums it up nicely. The strings in questions are the names of
> class fields (part of the CLASSDESC) and I will check that the JDK is happy
> about this.
>
> Tim
>
> Godmar Back wrote:
>
> > Let me see if I understand this:
> >
> > Inside the serialization stream, two strings with identical content
> > are serialized. Kaffe interns them, so it writes out the first, and
> > puts a token that refers to it in place of the second.
> >
> > Sun, on the other hand, writes out both because the strings happen
> > to be not interned in their VM, and hence they don't use a token
> > to refer to the earlier identical string in the stream.
> >
> > Does that describe the situation somewhat accurately or is this
> > totally off base? I'd say there's no problem if it does.
> >
> > Did you check whether Sun can read the stream as emitted by
> > kaffe and vice versa?
> >
> > - Godmar
> >
> > >
> > > We appear to have a rather odd bug in serialization which is shown up by
> > > Alias. While Alias works fine but is serial format is 2 bytes shorter
> > > than JDK. Turns out that this is because we're interning the strings
> > > and they happen to match.
> > >
> > > So both answer are right and compatible - but the serialization form is
> > > different though both kaffe and jdk should be able to handle both forms.
> > > I'm going to consider the interned form we use to be 'correct'.
> > >
> > > Isn't compatibility wonderful?
> > >
> > > Tim
> > >
> > > --
> > > Tim Wilkinson Tel: +1 510 704 1660
> > > Transvirtual Technologies, Inc., Fax: +1 510 704 1893
> > > Berkeley, CA, USA. Email: tim@transvirtual.com
> > >
> > >
> > >
> > >
>
>
>
> --
> Tim Wilkinson Tel: +1 510 704 1660
> Transvirtual Technologies, Inc., Fax: +1 510 704 1893
> Berkeley, CA, USA. Email: tim@transvirtual.com
>
>
>
>

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