Groups > comp.lang.java.programmer > #7677

Re: De-serializing an object with missing child classes

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From	"raphfrk@gmail.com" <raphfrk@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: De-serializing an object with missing child classes
Date	Wed, 7 Sep 2011 07:14:47 -0700 (PDT)
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On Sep 7, 6:46 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> I am not sure I get exactly what you mean here.  Do you want to
> resurrect class objects (i.e. the code) from the stream?  I don't think
> this is possible without complex logic.

I was thinking that the standard deserializer might be a relatively
low complexity recursive method.  It may be possible to copy that and
update it where it checks for a class match.

In the end I just had the custom reader use the defaultReadObject()
method and then read again.  If it hit EOF, then I assumed that it was
the old type.  Otherwise it read the extra info and updated
accordingly.

When read, it stored the child objects as either a byte array stored
in a dummy object or as the actual object if it could be deserialized.

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Thread

De-serializing an object with missing child classes "raphfrk@gmail.com" <raphfrk@gmail.com> - 2011-09-06 05:15 -0700
  Re: De-serializing an object with missing child classes Robert Klemme <shortcutter@googlemail.com> - 2011-09-06 05:34 -0700
    Re: De-serializing an object with missing child classes "raphfrk@gmail.com" <raphfrk@gmail.com> - 2011-09-06 07:17 -0700
      Re: De-serializing an object with missing child classes Robert Klemme <shortcutter@googlemail.com> - 2011-09-07 07:46 +0200
        Re: De-serializing an object with missing child classes Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-07 11:45 +0000
          Re: De-serializing an object with missing child classes "raphfrk@gmail.com" <raphfrk@gmail.com> - 2011-09-07 07:17 -0700
        Re: De-serializing an object with missing child classes "raphfrk@gmail.com" <raphfrk@gmail.com> - 2011-09-07 07:14 -0700
  Re: De-serializing an object with missing child classes Roedy Green <see_website@mindprod.com.invalid> - 2011-09-06 06:04 -0700
  Re: De-serializing an object with missing child classes Roedy Green <see_website@mindprod.com.invalid> - 2011-09-06 11:59 -0700
    Re: De-serializing an object with missing child classes Arne Vajhøj <arne@vajhoej.dk> - 2011-09-06 19:51 -0400
      Re: De-serializing an object with missing child classes markspace <-@.> - 2011-09-06 17:53 -0700
  Re: De-serializing an object with missing child classes Arne Vajhøj <arne@vajhoej.dk> - 2011-09-06 19:53 -0400

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