This is a list of top 5 rules engine which can be used in your Java application. Out of below 5 frameworks, Drools is the most popular one.
| Popularity | Rule Engine | Summary |
|---|---|---|
| 1 | Drools | A Business Rules Management System (BRMS) solution which provides a core business rules engine (BRE), a web authoring and rules management application (Drools Workbench) and an Eclipse IDE plugin for core development |
| 2 | OpenRules | A general purpose business rules and decision management system |
| 3 | EasyRules | EasyRules provides the Rule abstraction to create rules with conditions and actions, and the RulesEngine API that runs through a set of rules to evaluate conditions and execute actions. |
| 4 | JLisa | A Clips-like Rule engine accessible from Java with the full power of Common Lisp |
| 5 | Jess | A small, light and fast rule engine and scripting environment written entirely in Java; Gives access to all Java APIs |
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I found it very helpful. However the differences are not too understandable for me