prevalence @ c2

Prevalence Layer

Provides TransparentPersistence, Replication and FaultTolerance for business objects (PlainOldJavaObjects) through a combination of transaction journals and state snapshots. -- KlausWuestefeld.
Prevalence layers are typically three orders of magnitude faster than traditional databases for queries and just as fast for transaction processing.
ThePrevayler is a Java implementation.
Remember, c2.com is the first wiki. Advices found there about [object] programming definitely offer something rare.