Apache Derby
Derby is an embeddable SQL engine written entirely in Java. Fully transactional, multi-user with a decent SQL subset, Derby is a mature engine and freely available under the Apache license and is actively maintained. Derby project page. It is also distributed as part of Oracle's Java SE Development Kit (JDK) under the name of Java DB.
Read more about this topic: Embedded Database, Comparisons of Database Storage Engines
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“The Apache have a legend that the coyote brought them fire and that the bear in his hibernations communes with the spirits of the “overworld” and later imparts the wisdom gained thereby to the medicine men.”
—Administration in the State of Arizona, U.S. public relief program (1935-1943)