Oracle AI Database's JSON Relational Duality Views (or simply duality views) let you treat relational tables and JSON documents as two sides of the same model: build your relational schema, and use comprehensive, normalized JSON documents on top. In this article, we’ll walk through the json/jpa-duality-views sample, which combines Spring Boot, Spring Data JPA, and the Oracle JSON Duality View Spring Boot starter to generate read/write duality views from annotated JPA entities at application startup.