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Gemini is a very simple-to-use non-intrusive Java framework that seamlessly enables bidirectional relationships between plain old Java objects (POJO). It helps developers to write simpler code to implement rich domain models by eliminating the need to manually check referential integrity and take care of updating the opposite property of a relationship (both simple and container properties). Gemini is available under dual license:

 * General Public License (GPL) - if you use this version of Gemini you must release your code under GPL
 * Commercial license - if our GPL version of Gemini does not serve your needs (mostly intended for commercial software developers)