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Evrete is a lightweight, open-source Java rule engine (MIT license, JSR 94 compliant) designed to handle goals of any size and complexity with a developer-friendly interface. It avoids a fixed rule language, offering a versatile Rule Builder API and an Annotated Java Rules (AJR) module to turn Java classes into rules, with support for strings, functional interfaces, or DSL-based authoring from formats like text or spreadsheets. It processes JSON and XML, supports flexible fact types, is about 300 KB, Java 8+ compatible, has no third-party dependencies, and is highly customizable via SPI, with rules distributable as sources, class files, or JARs.
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