Re-stores dirty objects back into the session. This is necessary to support clustering, because (in most application servers) session objects are only broadcast around the cluster from setAttribute(). If a mutable session object is read and changed, those changes will be limited to a single server in the cluster, which can cause confusing application failures in the event of a failover. Does nothing if there are no changes, or the session has been invalidated.
@see OptimizedSessionPersistedObject
@see OptimizedSessionPersistedObjectAnalyzer
@see ImmutableSessionPersistedObject
@since 5.1.0.0
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