JSR331 “Java Constraint Programming API” is a JCP Specification Standard that has been developed under the terms of the www.JCP.org. On March-2012 JSR331 was officially approved by the JCP Executive Committee as the Final Release and moved to the maintenance mode.
This website describes the latest state of the standard and provides access to its various implementations using constraint and linear solvers.
If you have any technical questions, please post them at JSR-331 Support Forum.
See a simplify implementation at www.JavaSolver.com