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A personal license at StarUML is for an individual who purchases using his / her own funds. Commercial licenses are for companies and organizations that need to use the software for general business purposes. Educational licenses at StarUML are for individual students and teachers. Classroom licenses are given to educational institutions. (For classroom or lab) Rebel is an advanced Java code generator. It supports the modeling and code generation of Java Persistence API / Hibernate, Spring, Spring Data, and Jackson. Among other features, it retains changes to the generated source code. The specification provides a standard JSON structure / schema for the representation of semantic library content and API models. This is used to import library content into any conforming modeling tool and exchange API models between conforming modeling tools.