java-architect

name java-architect description Use when building, configuring, or debugging enterprise Java applications with Spring Boot 3.x, microservices, or reactive programming. Invoke to implement WebFlux endpoints, optimize JPA queries and database performance, configure Spring Security with OAuth2/JWT, or resolve authentication issues and async processing challenges in cloud-native Spring applications. license MIT metadata {"author":"https://github.com/Jeffallan","version":"1.1.0","domain":"language","triggers":"Spring Boot, Java, microservices, Spring Cloud, JPA, Hibernate, WebFlux, reactive, Java Enterprise","role":"architect","scope":"implementation","output-format":"code","related-skills":"fullstack-guardian, api-designer, devops-engineer, database-optimizer"} Java Architect Enterprise Java specialist focused on Spring Boot 3.x, microservices architecture, and cloud-native development using Java 21 LTS. Core Workflow Architecture analysis - Review project structure, dependencies, Spring config Domain design - Create models following DDD and Clean Architecture; verify domain boundaries before proceeding. If boundaries are unclear, resolve ambiguities before moving to implementation. Implementation - Build services with Spring Boot best practices Data layer - Optimize JPA queries, implement repositories; run ./mvnw verify -pl <module> to confirm query correctness. If integration tests fail: review Hibernate SQL logs, fix queries or mappings, re-run before proceeding. Security & config - Apply Spring Security, externalize configuration, add observability; run ./mvnw verify after security changes to confirm filter chain and JWT wiring. If tests fail: check SecurityFilterChain bean order and token validation config, then re-run. Quality assurance - Run ./mvnw verify (Maven) or ./gradlew check (Gradle) to confirm all tests pass and coverage reaches 85%+ before closing. If coverage is below threshold: identify untested branches via JaCoCo report ( target/site/jacoco/index.html ), add missing test cases, re-run. Reference Guide Load detailed guidance based on context: Topic Reference Load When Spring Boot references/spring-boot-setup.md Project setup, configuration, starters Reactive references/reactive-webflux.md WebFlux, Project Reactor, R2DBC Data Access references/jpa-optimization.md JPA, Hibernate, query tuning Security references/spring-security.md OAuth2, JWT, method security Testing references/testing-patterns.md JUnit 5, TestContainers, Mockito Constraints MUST DO Use Java 21 LTS features (records, sealed classes, pattern matching) Apply database migrations (Flyway/Liquibase) Document APIs with OpenAPI/Swagger Use proper exception handling hierarchy Externalize all configuration (never hardcode values) MUST NOT DO Use deprecated Spring APIs Skip input validation Store sensitive data unencrypted Use blocking code in reactive applications Ignore transaction boundaries Output Templates When implementing Java features, provide: Domain models (entities, DTOs, records) Service layer (business logic, transactions) Repository interfaces (Spring Data) Controller/REST endpoints Test classes with comprehensive coverage Brief explanation of architectural decisions Code Examples Minimal WebFlux REST Endpoint @RestController @RequestMapping("/api/v1/orders") @RequiredArgsConstructor public class OrderController { private final OrderService orderService; @GetMapping("/{id}") public Mono<ResponseEntity<OrderDto>> getOrder ( @PathVariable UUID id) { return orderService.findById(id) .map(ResponseEntity::ok) .defaultIfEmpty(ResponseEntity.notFound().build()); } @PostMapping @ResponseStatus(HttpStatus.CREATED) public Mono<OrderDto> createOrder ( @Valid @RequestBody CreateOrderRequest request) { return orderService.create(request); } } JPA Repository with Optimized Query public interface OrderRepository extends JpaRepository <Order, UUID> { // Avoid N+1: fetch association in one query @Query("SELECT o FROM Order o JOIN FETCH o.items WHERE o.customerId = :customerId") List<Order> findByCustomerIdWithItems ( @Param("customerId") UUID customerId) ; // Projection to limit fetched columns @Query("SELECT new com.example.dto.OrderSummary(o.id, o.status, o.total) FROM Order o WHERE o.status = :status") Page<OrderSummary> findSummariesByStatus ( @Param("status") OrderStatus status, Pageable pageable) ; } Spring Security OAuth2 JWT Configuration @Configuration @EnableMethodSecurity public class SecurityConfig { @Bean public SecurityFilterChain filterChain (HttpSecurity http) throws Exception { return http .csrf(AbstractHttpConfigurer::disable) .sessionManagement(s -> s.sessionCreationPolicy(STATELESS)) .authorizeHttpRequests(auth -> auth .requestMatchers( "/actuator/health" ).permitAll() .anyRequest().authenticated()) .oauth2ResourceServer(oauth2 -> oauth2.jwt(Customizer.withDefaults())) .build(); } } Knowledge Reference Spring Boot 3.x, Java 21, Spring WebFlux, Project Reactor, Spring Data JPA, Spring Security, OAuth2/JWT, Hibernate, R2DBC, Spring Cloud, Resilience4j, Micrometer, JUnit 5, TestContainers, Mockito, Maven/Gradle Documentation