Gone are the days of package-by-layer ( controller , service , repository ). The modern recommendation is . This keeps related logic together, making the application modular.
Spring Boot automatically configures your application based on the jar dependencies you have added. Pre-configured dependency descriptors (e.g., spring-boot-starter-web ) that bundle common libraries together to reduce manual build.gradle management. Spring Initializr: The standard entry point for starting a project at start.spring.io , which generates a curated project structure. Typical Architectural Structure spring boot 3 project
public record UserDto(String id, String email, String name) {} Gone are the days of package-by-layer ( controller
public UserController(UserClient userClient) this.userClient = userClient; spring boot 3 project
Startup time drops from ~2 seconds to . Memory usage drops by 60%.
Key drivers for adoption: