easy-rules/site/about/overview.md

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Easy Rules is a simple yet powerful Java rules engine providing the following features:

• Lightweight framework and easy to learn API
• POJO based development
• Useful abstractions to define business rules and apply them easily
• The ability to create composite rules from primitive ones
• Dynamic rule configuration at runtime using JMX

In a very interesting article about rules engines, Martin Fowler says:

You can build a simple rules engine yourself. All you need is to create a bunch of objects with conditions and actions, store them in a collection, and run through them to evaluate the conditions and execute the actions.

This is exactly what Easy Rules does, with more features like rule composition and dynamic configuration.