{"slug":"affaan-m-springboot-patterns","name":"springboot-patterns","description":"Spring Boot architecture patterns, REST API design, layered services, data access, caching, async processing, and logging. Use for Java Spring Boot backend work. Use when building or reviewing a Spring Boot backend — REST layer, services, data access, caching, or async work.","long_description":"---\nname: springboot-patterns\ndescription: Spring Boot architecture patterns, REST API design, layered services, data access, caching, async processing, and logging. Use for Java Spring Boot backend work. Use when building or reviewing a Spring Boot backend — REST layer, services, data access, caching, or async work.\nmetadata:\n origin: ECC\n---\n\n# Spring Boot Development Patterns\n\nSpring Boot architecture and API patterns for scalable, production-grade services.\n\n## When to Activate\n\n- Building REST APIs with Spring MVC or WebFlux\n- Structuring controller → service → repository layers\n- Configuring Spring Data JPA, caching, or async processing\n- Adding validation, exception handling, or pagination\n- Setting up profiles for dev/staging/production environments\n- Implementing event-driven patterns with Spring Events or Kafka\n\n## REST API Structure\n\n```java\n@RestController\n@RequestMapping(\"/api/markets\")\n@Validated\nclass MarketController {\n private final MarketService marketService;\n\n MarketController(MarketService marketService) {\n this.marketService = marketService;\n }\n\n @GetMapping\n ResponseEntity> list(\n @RequestParam(defaultValue = \"0\") int page,\n @RequestParam(defaultValue = \"20\") int size) {\n Page markets = marketService.list(PageRequest.of(page, size));\n return ResponseEntity.ok(markets.map(MarketResponse::from));\n }\n\n @PostMapping\n ResponseEntity create(@Valid @RequestBody CreateMarketRequest request) {\n Market market = marketService.create(request);\n return ResponseEntity.status(HttpStatus.CREATED).body(MarketResponse.from(market));\n }\n}\n```\n\n## Repository Pattern (Spring Data JPA)\n\n```java\npublic interface MarketRepository extends JpaRepository {\n @Query(\"select m from MarketEntity m where m.status = :status order by m.volume desc\")\n List findActive(@Param(\"status\") MarketStatus status, Pageable pageable);\n}\n```\n\n## Service Layer with Transactions\n\n```java\n@Service\npublic class MarketService {\n private final MarketRepository repo;\n\n public MarketService(MarketRepository repo) {\n this.repo = repo;\n }\n\n @Transactional\n public Market create(CreateMarketRequest request) {\n MarketEntity entity = MarketEntity.from(request);\n MarketEntity saved = repo.save(entity);\n return Market.from(saved);\n }\n}\n```\n\n## DTOs and Validation\n\n```java\npublic record CreateMarketRequest(\n @NotBlank @Size(max = 200) String name,\n @NotBlank @Size(max = 2000) String description,\n @NotNull @FutureOrPresent Instant endDate,\n @NotEmpty List<@NotBlank String> categories) {}\n\npublic record MarketResponse(Long id, String name, MarketStatus status) {\n static MarketResponse from(Market market) {\n return new MarketResponse(market.id(), market.name(), market.status());\n }\n}\n```\n\n## Exception Handling\n\n```java\n@ControllerAdvice\nclass GlobalExceptionHandler {\n @ExceptionHandler(MethodArgumentNotValidException.class)\n ResponseEntity handleValidation(MethodArgumentNotValidException ex) {\n String message = ex.getBindingResult().getFieldErrors().stream()\n .map(e -> e.getField() + \": \" + e.getDefaultMessage())\n .collect(Collectors.joining(\", \"));\n return ResponseEntity.badRequest().body(ApiError.validation(message));\n }\n\n @ExceptionHandler(AccessDeniedException.class)\n ResponseEntity handleAccessDenied() {\n return ResponseEntity.status(HttpStatus.FORBIDDEN).body(ApiError.of(\"Forbidden\"));\n }\n\n @ExceptionHandler(Exception.class)\n ResponseEntity handleGeneric(Exception ex) {\n // Log unexpected errors with stack traces\n return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)\n .body(ApiError.of(\"Internal server error\"));\n }\n}\n```\n\n## Caching\n\nRequires `@EnableCaching` on a configuration class.\n\n```java\n@Service\npublic class MarketCacheService {\n private final MarketRepository repo;\n\n public MarketCacheService(MarketRepository repo) {\n this.repo = repo;\n }\n\n @Cacheable(value = \"market\", key = \"#id\")\n public Market getById(Long id) {\n return repo.findById(id)\n .map(Market::from)\n .orElseThrow(() -> new EntityNotFoundException(\"Market not found\"));\n }\n\n @CacheEvict(value = \"market\", key = \"#id\")\n public void evict(Long id) {}\n}\n```\n\n## Async Processing\n\nRequires `@EnableAsync` on a configuration class.\n\n```java\n@Service\npublic class NotificationService {\n @Async\n public CompletableFuture sendAsync(Notification notification) {\n // send email/SMS\n return CompletableFuture.completedFuture(null);\n }\n}\n```\n\n## Logging (SLF4J)\n\n```java\n@Service\npublic class ReportService {\n private static final Logger log = LoggerFactory.getLogger(ReportService.class);\n\n public Report generate(Long marketId) {\n log.info(\"generate_report marketId={}\", marketId);\n try {\n // logic\n } catch (Exception ex) {\n log.error(\"generate_report_failed marketId={}\", marketId, ex);\n throw ex;\n }\n return new Report();\n }\n}\n```\n\n## Middleware / Filters\n\n```java\n@Component\npublic class RequestLoggingFilter extends OncePerRequestFilter {\n private static final Logger log = LoggerFactory.getLogger(RequestLoggingFilter.class);\n\n @Override\n protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,\n FilterChain filterChain) throws ServletException, IOException {\n long start = System.currentTimeMillis();\n try {\n filterChain.doFilter(request, response);\n } finally {\n long duration = System.currentTimeMillis() - start;\n log.info(\"req method={} uri={} status={} durationMs={}\",\n request.getMethod(), request.getRequestURI(), response.getStatus(), duration);\n }\n }\n}\n```\n\n## Pagination and Sorting\n\n```java\nPageRequest page = PageRequest.of(pageNumber, pageSize, Sort.by(\"createdAt\").descending());\nPage results = marketService.list(page);\n```\n\n## Error-Resilient External Calls\n\n```java\npublic T withRetry(Supplier supplier, int maxRetries) {\n int attempts = 0;\n while (true) {\n try {\n return supplier.get();\n } catch (Exception ex) {\n attempts++;\n if (attempts >= maxRetries) {\n throw ex;\n }\n try {\n Thread.sleep((long) Math.pow(2, attempts) * 100L);\n } catch (InterruptedException ie) {\n Thread.currentThread().interrupt();\n throw ex;\n }\n }\n }\n}\n```\n\n## Rate Limiting (Filter + Bucket4j)\n\n**Security Note**: The `X-Forwarded-For` header is untrusted by default because clients can spoof it.\nOnly use forwarded headers when:\n1. Your app is behind a trusted reverse proxy (nginx, AWS ALB, etc.)\n2. You have registered `ForwardedHeaderFilter` as a bean\n3. You have configured `server.forward-headers-strategy=NATIVE` or `FRAMEWORK` in application properties\n4. Your proxy is configured to overwrite (not append to) the `X-Forwarded-For` header\n\nWhen `ForwardedHeaderFilter` is properly configured, `request.getRemoteAddr()` will automatically\nreturn the correct client IP from the forwarded headers. Without this configuration, use\n`request.getRemoteAddr()` directly—it returns the immediate connection IP, which is the only\ntrustworthy value.\n\n```java\n@Component\npublic class RateLimitFilter extends OncePerRequestFilter {\n private final Map buckets = new ConcurrentHashMap<>();\n\n /*\n * SECURITY: This filter uses request.getRemoteAddr() to identify clients for rate limiting.\n *\n * If your application is behind a reverse proxy (nginx, AWS ALB, etc.), you MUST configure\n * Spring to handle forwarded headers properly for accurate client IP detection:\n *\n * 1. Set server.forward-headers-strategy=NATIVE (for cloud platforms) or FRAMEWORK in\n * application.properties/yaml\n * 2. If using FRAMEWORK strategy, register ForwardedHeaderFilter:\n *\n * @Bean\n * ForwardedHeaderFilter forwardedHeaderFilter() {\n * return new ForwardedHeaderFilter();\n * }\n *\n * 3. Ensure your proxy overwrites (not appends) the X-Forwarded-For header to prevent spoofing\n * 4. Configure server.tomcat.remoteip.trusted-proxies or equivalent for your container\n *\n * Without this configuration, request.getRemoteAddr() returns the proxy IP, not the client IP.\n * Do NOT read X-Forwarded-For directly—it is trivially spoofable without trusted proxy handling.\n */\n @Override\n protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,\n FilterChain filterChain) throws ServletException, IOException {\n // Use getRemoteAddr() which returns the correct client IP when ForwardedHeaderFilter\n // is configured, or the direct connection IP otherwise. Never trust X-Forwarded-For\n // headers directly without proper proxy configuration.\n String clientIp = request.getRemoteAddr();\n\n Bucket bucket = buckets.computeIfAbsent(clientIp,\n k -> Bucket.builder()\n .addLimit(Bandwidth.classic(100, Refill.greedy(100, Duration.ofMinutes(1))))\n .build());\n\n if (bucket.tryConsume(1)) {\n filterChain.doFilter(request, response);\n } else {\n response.setStatus(HttpStatus.TOO_MANY_REQUESTS.value());\n }\n }\n}\n```\n\n## Background Jobs\n\nUse Spring’s `@Scheduled` or integrate with queues (e.g., Kafka, SQS, RabbitMQ). 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