Spring Boot In Action [cracked] 👑

@Scheduled(fixedDelay = 5000) public void fixedDelayTask() { // Runs 5 seconds after previous execution }

@CacheEvict(value = "users", allEntries = true) public void clearCache() { } } Scheduled Tasks @Configuration @EnableScheduling public class SchedulingConfig { } @Component public class ScheduledTasks {

@CacheEvict(value = "users", key = "#user.id") public User update(User user) { return userRepository.save(user); } spring boot in action

@MockBean private UserService userService;

This comprehensive guide covers the essential features of Spring Boot in action for building production-ready applications. } @MockBean private UserService userService

@Component @RabbitListener(queues = "order.queue") public class OrderListener { @RabbitHandler public void handleOrder(Order order) { System.out.println("Received order: " + order.getId()); } } File Upload @PostMapping("/upload") public ResponseEntity<String> handleUpload(@RequestParam("file") MultipartFile file) throws IOException { Path path = Paths.get("uploads/" + file.getOriginalFilename()); Files.write(path, file.getBytes()); return ResponseEntity.ok("File uploaded successfully"); } // Async file processing @Async public CompletableFuture<String> processFile(MultipartFile file) { // Process large files asynchronously } 14. Error Handling Global Exception Handler @RestControllerAdvice public class GlobalExceptionHandler { @ExceptionHandler(MethodArgumentNotValidException.class) @ResponseStatus(HttpStatus.BAD_REQUEST) public Map<String, String> handleValidation(MethodArgumentNotValidException ex) { return ex.getBindingResult().getFieldErrors().stream() .collect(Collectors.toMap( FieldError::getField, FieldError::getDefaultMessage )); }

@Service public class UserService { @Cacheable(value = "users", key = "#id") public User findById(Long id) { return userRepository.findById(id).orElseThrow(); } return ResponseEntity.ok("File uploaded successfully")

@Component public class OrderPublisher { @Autowired private RabbitTemplate rabbitTemplate;