It's not needed by JBoss Cache per se, it's needed by Hibernate. Briefly
mentioned in the Hibernate docs at
http://www.hibernate.org/hib_docs/v3/reference/en/html/performance.html#p....
Basically, Hibernate tracks the update timestamp for an entity type so it can know if any
cached query results may have been invalidated due to a change in the queried entities.
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