FlowExecutionSnapshotGroup not retrieving snapshots for custom ConversationRepository

Related with the post http://forum.springsource.org/showth...MongoDB-issues Where I described I wrote a custom ConversationManager, I have an issue with webflow not being able to retrieve snapshots from the snapshot group. The reason is in SimpleFlowExecutionSnapshotGroup's getSnapshot method:

Code:

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        public FlowExecutionSnapshot getSnapshot(Serializable snapshotId) throws SnapshotNotFoundException {
                FlowExecutionSnapshot snapshot = (FlowExecutionSnapshot) snapshots.get(snapshotId);
                if (snapshot == null) {
                        throw new SnapshotNotFoundException(snapshotId);
                }
                return snapshot;
        }

---

Serializable snapshotId real type is Integer, while the snapshots map has string keys, causing snapshots.get(snapshotId) to return nothing.

Any thoughts?

Thanks,
Marco