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SimpleORM provides provides a very simple and easy way to implement object/relational mapping on top of JDBC atlow cost and low overhead. Not even an XML file to configure! It has clean database semantics and is very scalable. See http://berglas.org/simpleorm/index.html.
...It uses Xeger, a java package for generating random text from regular expressions (http://code.google.com/p/xeger/).
Xeger uses dk.brics.automaton java package developed by Anders Møller (http://cs.au.dk/~amoeller/automaton/index.html).
This is a simple RMI wrapper around Oracle Berkeley DB Java edition (www.oracle.com/technology/products/berkeley-db/index.html) which originally comes in embedded mode. Now you can use it as a database daemon. Spring is used to export RMI service.