Has anyone looked at writing a cache store that uses MapDB? It provides Maps, Sets and Queues backed by disk storage or off-heap memory, with MVCC and (non-JTA) transactions. The author previously wrote JDBM (multiple versions), and has recently ventured out on his own to focus on MapDB full-time. It's only at 0.9.5, but progressing quite nicely. I've been looking at it for other uses, and quite enjoy it.

        http://mapdb.org
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