This is an Object-relational mapping tool for Java. It does not have all the bells and whistles of modern tools like Hibernate, but is still quite functional.
It is currently in Early Beta stage and needs testing/input, therefore it is not recommended for production use.
It is written in Groovy and is roughly 1000 lines of code.
It requires a JDBC 3.0 driver, Groovy, Commons Logging and JDOM.
