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Change tracking using backup clone should postpone backup clone creation. Since EclipseLink will generate StackOverflow if object are not cached at all in session cache, we can assume all objects has an instance in session cache. So backup clone equal session cache in most cases. So to avoid creating unneeded backup clone, backup clone creation should be postponed and done lazilly when ever the session cache instance is modified and an outstanding UOW has requested a backup clone for its change tracking.
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink