Spring Boot Error Handling Rules

Global exception handling in Spring Boot REST APIs is implemented using a centralized `@ControllerAdvice` class. This approach intercepts exceptions across the whole application, mapping custom business exceptions and error code enums to consistent HTTP responses like 409 Conflict for duplicate entities.

The best way to return standardized error codes for Spring Boot exceptions is by defining an error code enum. This enum pairs with custom business exceptions and a global exception handler to ensure consistent API error responses across scenarios like invalid input or entity not found.

Yes, this Spring Boot error handling pattern supports external API failures. It provides specific patterns for external API error management, allowing your application to gracefully handle and map service failures into standardized error responses via the global exception handler.

To handle duplicate entity creation in a Spring Boot application, you use custom business exceptions. When a user creates a resource with an existing name, the application catches the exception and returns a 409 Conflict status with a specific error code and message.

Yes, you can use this exception handling approach with Kotlin Spring Boot applications. The pattern relies on standard framework features like `@ControllerAdvice` and custom exceptions, which are fully compatible with Kotlin for building robust REST APIs.

You need custom business exceptions in Spring Boot when handling domain-specific failures like entity not found, duplicate entity creation, or invalid input. They allow you to attach specific error codes and map them to appropriate HTTP statuses through centralized global exception handling.