This plugin allows you to generate client and server SDKs for different languages, documentation and new generators from OpenAPI 2.0 and 3.x specifications. It does mostly the same things as openapi generator plugin but has a set of additional parameters: 1. Java client retrofit2 generator: add "interfaceOnly" additional property. If it's true, only API interfaces are generated. 2. Java client retrofit2 generator: allow to select serialization library when interfaceOnly = true. It's possible to use jackson instead of gson. 3. Possibility to configure useOneOfInterfaces via additional properties. Generation oneOf interfaces for Java Spring generator.