spring-boot-3

Typed configuration properties in Spring Boot 3 are implemented using dedicated configuration classes with validation constraints. This approach securely maps application properties to strongly typed Java objects, ensuring configuration values are validated at application startup.

The best way to set up dependency injection in Spring Boot 3 is using constructor injection. This pattern enforces immutable dependencies, improves testability, and provides clearer visibility into a class's required collaborators compared to field injection.

REST API controllers and services in Spring Boot 3 should be structured by delegating business logic to the service layer. Controllers handle HTTP requests and responses, while the service layer contains the core logic and explicitly defines transaction boundaries.

Yes, Spring Boot 3 patterns are applicable for refactoring existing Java backend applications. You can migrate to typed configuration properties with validation, enforce constructor injection, and establish explicit transaction boundaries at the service layer.

Transaction boundaries in a Spring Boot 3 service layer are needed when operations involve multiple database writes or complex business logic. Defining them at the service layer ensures data consistency and maintains clear separation from controller HTTP handling.

Yes, these Spring Boot 3 patterns are specifically designed for building new microservices and refactoring existing ones on version 3.3+. They ensure your project adheres to established patterns for configuration, dependency injection, and web services from the outset.