OptimJ: Java-based Modeling Language for Optimization

OptimJ™ help you develop, document and test large optimization-based applications faster and with better quality.

Key Features

• 100% Java compatible and available as Eclipse plugin
• Powerful data preprocessing features
• Compiler-generated graphical interface
• State-of-the-art productivity tools (CVS, Junit, Javadoc etc..)

Key Benefits

• Rapid visual prototyping & deployment
• Huge impact on developer's productivity and code quality
• Bridge the gap between OR experts and IT: no integration code needed.
• Support multiple target solvers

Learn More

• Read OptimJ technical overview
• Understand how OptimJ boosts productivity and quality
• Read the manual
• Consult the OptimJ FAQ
• Download a free OptimJ License

Supported solvers

• lp_solve
• GLPK
• Gurobi Optimizer™
• Mosek Optimization Software™
• IBM ILOG CPLEX™
• LP or MPS file formats

Other solver links for non-linear, gradient-based and constraint-based solvers are under development. Please tell us which solver you would like to use.

A new approach to modeling

OptimJ is an extension of the Java programming language with language support for writing optimization models and powerful abstractions for bulk data processing. The language is supported by programming tools and language-aware editing under the Eclipse environment.

OptimJ is an extension of Java

• Any valid Java program is also a valid OptimJ program
• OptimJ operates directly on Java objects and can be combined with any other Java classes.
• The whole Java library is directly available from OptimJ
• OptimJ is compatible with standard productivity tools such as unit testing or GUI designers.

See our code samples.

OptimJ is an algebraic modeling language

Optimization concepts such as decision variables, constraints and objective function are directly expressible in OptimJ in a clear and intuitive way. Additionally, OptimJ offers powerful bulk data processing primitives to preprocess and clean your input data.
OptimJ is efficient, doing all its work at compile-time and generating direct calls to the underlying solver API.

OptimJ GUI

OptimJ GUI is a free graphical user interface (GUI) for LP/MIP solvers. Its main features are:

• visualize in real time the internal lp_solve state and objective value
• parameterize lp_solve with various settings
• display in real time the model structure

While the current version only works with lp_solve, OptimJ GUI will progressively be targeted to all solvers supported by OptimJ.