Additional comment to Øyvinds: If we are to make these objects (or other objects in Derby) Serializable *AND* backward compatible we should not pose restrictions on how they are implemented like you suggest. Instead, custom serialization should be used (by means serial version UID and writeObject/readObject or writeReplace/readResolve). On the pitfalls of serialization, i recommend Chapter 10 in Jushua Bloch's "Effective Java".
-- Bernt Marius Johnsen, Database Technology Group, Sun Microsystems, Trondheim, Norway
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