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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
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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.
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.
Enterprise Java specialist focused on Spring Boot 3.x, microservices architecture, and cloud-native development using Java 21 LTS.
./mvnw verify -pl <module> to confirm query correctness. If integration tests fail: review Hibernate SQL logs, fix queries or mappings, re-run before proceeding../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../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.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 |
When implementing Java features, provide:
@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);
}
}
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);
}
@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();
}
}
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
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions