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JaCoP solver is Java-based open source solver developed and maintained mainly by two people Krzysztof Kuchcinski - Dept. of Computer Science, Lund University, Sweden, and Radoslaw Szymanek - Crossing-Tech.
 
Moreover a number of students have contributed to the solver by programming first versions of different global constraints and set constraints. The solver is being used in academia for research and
teaching as well as in industry for commercial purposes. The most successful use of the solver is within Electronic Design Automation community, since both main authors come from that community.

JaCoP supports finite domains of integers and sets of integers as well as floating-point domain.  It offers a significant number of primitive and global constraints on these variables to facilitate modeling as well as modular design of search. This allows to tailor search to
characteristics of the problem being addressed. It has currently more than 100,000 lines of code, not including examples and testing code. The examples which are the preferred way to document the abilities of JaCoP have more than 20.000 lines of code. The core
developers have been working on JaCoP for past 10 years during their free time as a hobby activity. It has been refactored, transformed, and improved many times. Initial versions of JaCoP were even 3 orders of magnitude slower than the current version. JaCoP implementation has
been influenced heavily by more than 20 research articles. Moreover, JaCoP was used as a tool to conduct experiments for CP publications.

The major focus of JaCoP are its constraints. These constraints include rich set of primitive, logical, and conditional constraints as well as many global constraints. The most important global constraints are as follows :

- diff2, 
- cumulative, 
- alldifferent (with bounds consistency and complete algorithm based
  on Régin's algorithm),
- gcc, 
- extensional support (with three different state-of-the-art approaches)
  and extensional conflict,
- among,
- element, 
- circuit and subcircuit,
- knapsack, 
- binpacking,
- regular,
- netflow, and 
- geost.

JaCoP software has won many awards in the international Minizinc competition over number of years. JaCoP solver can be used directly from Java but it has several front-ends. It has FlatZinc language interface that makes it possible to execute MiniZinc models. Therefore, you do not have to program in Java in order to use this solver. It is enough to learn Minizinc, automatically transform into optimized Flatzinc and read the problem into JaCoP. It allows us to perform extensive testing with the help of other solvers as we can compare results from For software developers that love Scala, we also provide Scala based domain-specific language so it is easier to create your own constraint programs even in more intuitive manner.
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