Cayenne is an OpenSource object-relational persistence framework written in Java. It provides tools and libraries to work with relational databases in an object-oriented way. Cayenne consists of class libraries and a GUI tool for ObjectRelationalMapping and deployment.  It  is shipped under ApacheStyleLicense to have as fewer restrictions as possible. Some ideas were inspired by NeXT EnterpriseObjectsFramework.

Cayenne project site is located at http://objectstyle.org/cayenne/

For a comparison of Cayenne with other similar technologies, see ObjectRelationalToolComparison..

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"Some ideas were inspiredby NeXT EnterpriseObjectsFramework." is quite a bit of an understatement. It's deja vue all over! In a good way, though ;). See http://objectstyle.org/cayenne/userguide/misc.html#webobjects. -- FalkBruegmann

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See also: 
	* http://sourceforge.net/projects/cayenne/
	* Cayenne FAQ: http://objectstyle.org/cayenne/faq/