---
name: java-architect-6f229adf2c60
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
  company: https://synergetic.solutions
  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

1. **Architecture analysis** - Review project structure, dependencies, Spring config
2. **Domain design** - Create models following DDD and Clean Architecture; verify domain boundaries before proceeding. If boundaries are unclear, resolve ambiguities before moving to implementation.
3. **Implementation** - Build services with Spring Boot best practices
4. **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.
5. **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.
6. **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:
1. Domain models (entities, DTOs, records)
2. Service layer (business logic, transactions)
3. Repository interfaces (Spring Data)
4. Controller/REST endpoints
5. Test classes with comprehensive coverage
6. Brief explanation of architectural decisions

## Code Examples

### Minimal WebFlux REST Endpoint

```java
@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

```java
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

```java
@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

Maintained by [@jeffallan](https://github.com/jeffallan), Principal Consultant at [Synergetic Solutions](https://synergetic.solutions)

[Documentation](https://jeffallan.github.io/claude-skills/skills/language/java-architect/)


---
Source attribution: Jeffallan
Original project: https://github.com/Jeffallan/claude-skills
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Dave AI.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Dave AI resource metadata

Creator / publisher: Jeffallan
Original project: https://github.com/Jeffallan/claude-skills
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Development & Engineering, Product Management
Roles: Backend Developer, DevOps / SRE, Full-Stack Developer, Product Manager, Technical Product Manager
Specialties: Backend
Tools: Java, Spring Boot
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: da681f53ec77974ade01fa4f702d80818266020b3efed253440b4d6383731441