UserController.java

@RestController
@RequestMapping("/api/v1/users")
public class UserController {

	private UserService service;

	public UserController(UserService service) {
		this.service = service;
	}

	@GetMapping
	public List<User> findAll() {
		return service.findAll();
	}
	
	@GetMapping("/{userId}")
	public User findUser(@PathVariable long userId) {
		return service.findUser(userId);
	}

	@PostMapping
	public ResponseEntity<User> createUser(@RequestBody User user) {
		User createdUser = service.createUser(user);
		return ResponseEntity.created(URI.create(String.format("/api/v1/users/%d", createdUser.getId())))
				.body(createdUser);
	}

	@PutMapping("/{userId}")
	public User updateUser(@PathVariable long userId, @RequestBody User user) {
		return service.updateUser(userId, user);
	}

	@DeleteMapping("/{userId}")
	public ResponseEntity<Void> deleteUser(@PathVariable long userId) {
		service.deleteUser(userId);
		return ResponseEntity.ok().build();
	}
	
	
	@ExceptionHandler(ClientException.class)
	public ResponseEntity<String> clientError(ClientException e) {
		return ResponseEntity.badRequest().body(e.getMessage());
	}

	@ExceptionHandler(NotFoundException.class)
	public ResponseEntity<String> resourceNotFound(NotFoundException e) {
		return ResponseEntity.notFound().build();
	}
}