continuous integration ..

tools such as Ant or Maven are the foundation for continuous integration. You can build on that foundation by using a dedicated continuous integration tool like CruiseControl, Gump or AntHill.

ant
http://ant.apache.org

maven
http://maven.apache.org

CruiseControl
http://cruisecontrol.sourceforge.net/

Gump
http://jakarta.apache.org/gump/

AntHill
http://www.urbancode.com/projects/anthill/