Answers

1. OAS was introduced to solve at least a few aspects of a REST API’s specification and description. It allows you to write REST APIs in the YAML or JSON markup languages, which allows you to interact with all stakeholders, including those who are non-technical, for review and discussion in the development phase. It also allows you to generate documentation, models, interfaces, clients, and servers in different languages.
2. The array is defined using the following code:

   type: arrayitems:  type: array  items:    type: string

3. You need a class annotation, @ControllerAdvice, and a method annotation, @ExceptionHandler, to implement the Global Exception Handler.
4. You can use --type-mappings and --import-mappings rawOptions in the swaggerSources task of the build.gradle file.
5. We only generate the models and API Java interfaces using Swagger Codegen because this allows the complete implementation of controllers by developers...