spjoshis Spring Boot Development
Build production-ready Spring Boot applications with REST APIs, data access, security, and microservices patterns.
Core Patterns
REST Controller
@RestController
@RequestMapping("/api/users")
public class UserController {
@Autowired
private UserService userService;
@GetMapping
public List<User> getAllUsers() {
return userService.findAll();
}
@GetMapping("/{id}")
public ResponseEntity<User> getUserById(@PathVariable Long id) {
return userService.findById(id)
.map(ResponseEntity::ok)
.orElse(ResponseEntity.notFound().build());
}
@PostMapping
public ResponseEntity<User> createUser(@Valid @RequestBody UserDto userDto) {
User user = userService.create(userDto);
return ResponseEntity.status(HttpStatus.CREATED).body(user);
}
}
Service Layer
@Service
@Transactional
public class UserService {
@Autowired
private UserRepository userRepository;
public List<User> findAll() {
return userRepository.findAll();
}
public Optional<User> findById(Long id) {
return userRepository.findById(id);
}
public User create(UserDto dto) {
User user = new User();
user.setName(dto.getName());
user.setEmail(dto.getEmail());
return userRepository.save(user);
}
}
Repository
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
Optional<User> findByEmail(String email);
List<User> findByNameContaining(String name);
}
Configuration
@Configuration
public class AppConfig {
@Bean
public ModelMapper modelMapper() {
return new ModelMapper();
}
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
Best Practices
- Use constructor injection
- Implement proper exception handling
- Use DTOs for API contracts
- Leverage Spring Boot starters
- Use profiles for environments
- Implement proper logging
- Write integration tests
- Use validation annotations