Demo Backend

Demo Backend Project Skills

Architecture

• Spring Boot 3.3 with Java 21
• Spring Data JPA with H2 database
• Layered architecture: Controller → Service → Repository

Code Conventions

Controller Layer

• Use @RestController annotation
• Use @RequestMapping("/api/xxx") for base path
• Return ResponseEntity<T> with proper status codes
• Handle exceptions using @ExceptionHandler

Service Layer

• Use @Service annotation
• Use @RequiredArgsConstructor for dependency injection
• Implement business logic in service classes

Entity Layer

• Use @Entity annotation
• Use Lombok @Data, @NoArgsConstructor, @AllArgsConstructor, @Builder
• Use @Id and @GeneratedValue(strategy = GenerationType.IDENTITY) for primary keys

Repository Layer

• Extend JpaRepository<T, ID>
• Define custom query methods using Spring Data JPA naming conventions

DTO Layer

• Use Lombok @Data
• Separate request and response DTOs
• Use validation annotations (@NotNull, @Size, etc.)

API Standards

• Use RESTful design patterns
• Use appropriate HTTP methods: GET, POST, PUT, DELETE
• Return JSON responses
• Use consistent error handling

Dependencies

• Spring Boot Starter Web
• Spring Boot Starter Data JPA
• Spring Boot Starter Validation
• Lombok
• H2 Database (runtime)

Testing

• Use Spring Boot Test
• Use Mockito for mocking
• Write unit tests for services
• Write integration tests for controllers