spring-boot-engineer
Generates Spring Boot 3.x configurations, creates REST controllers, implements Spring Security 6 authentication flows, sets up Spring Data JPA repositories, and configures reactive WebFlux endpoints. Use when building Spring Boot 3.x applications, microservices, or reactive Java applications; invoke for Spring Data JPA, Spring Security 6, WebFlux, Spring Cloud integration, Java REST API design, or Microservices Java architecture.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/jeffallan/claude-skills --skill spring-boot-engineer- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads spring-boot-engineer automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
Spring Boot Engineer
Core Workflow
- Analyze requirements — Identify service boundaries, APIs, data models, security needs
- Design architecture — Plan microservices, data access, cloud integration, security; confirm design before coding
- Implement — Create services with constructor injection and layered architecture (see Quick Start below)
- Secure — Add Spring Security, OAuth2, method security, CORS configuration; verify security rules compile and pass tests. If compilation or tests fail: review error output, fix the failing rule or configuration, and re-run before proceeding
- Test — Write unit, integration, and slice tests; run
./mvnw test(or./gradlew test) and confirm all pass before proceeding. If tests fail: review the stack trace, isolate the failing assertion or component, fix the issue, and re-run the full suite - Deploy — Configure health checks and observability via Actuator; validate
/actuator/healthreturnsUP. If health isDOWN: check thecomponentsdetail in the response, resolve the failing component (e.g., datasource, broker), and re-validate
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Web Layer | references/web.md | Controllers, REST APIs, validation, exception handling |
| Data Access | references/data.md | Spring Data JPA, repositories, transactions, projections |
| Security | references/security.md | Spring Security 6, OAuth2, JWT, method security |
| Cloud Native | references/cloud.md | Spring Cloud, Config, Discovery, Gateway, resilience |
| Testing | references/testing.md | @SpringBootTest, MockMvc, Testcontainers, test slices |
Quick Start — Minimal Working Structure
A standard Spring Boot feature consists of these layers. Use these as copy-paste starting points.
Entity
@Entity
@Table(name = "products")
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@NotBlank
private String name;
@DecimalMin("0.0")
private BigDecimal price;
// getters / setters or use @Data (Lombok)
}
Repository
public interface ProductRepository extends JpaRepository<Product, Long> {
List<Product> findByNameContainingIgnoreCase(String name);
}
Service (constructor injection)
@Service
public class ProductService {
private final ProductRepository repo;
public ProductService(ProductRepository repo) { // constructor injection — no @Autowired
this.repo = repo;
}
@Transactional(readOnly = true)
public List<Product> search(String name) {
return repo.findByNameContainingIgnoreCase(name);
}
@Transactional
public Product create(ProductRequest request) {
var product = new Product();
product.setName(request.name());
product.setPrice(request.price());
return repo.save(product);
}
}
REST Controller
@RestController
@RequestMapping("/api/v1/products")
@Validated
public class ProductController {
private final ProductService service;
public ProductController(ProductService service) {
this.service = service;
}
@GetMapping
public List<Product> search(@RequestParam(defaultValue = "") String name) {
return service.search(name);
}
@PostMapping
@ResponseStatus(HttpStatus.CREATED)
public Product create(@Valid @RequestBody ProductRequest request) {
return service.create(request);
}
}
DTO (record)
public record ProductRequest(
@NotBlank String name,
@DecimalMin("0.0") BigDecimal price
) {}
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));
}
@ExceptionHandler(EntityNotFoundException.class)
@ResponseStatus(HttpStatus.NOT_FOUND)
public Map<String, String> handleNotFound(EntityNotFoundException ex) {
return Map.of("error", ex.getMessage());
}
}
Test Slice
@WebMvcTest(ProductController.class)
class ProductControllerTest {
@Autowired MockMvc mockMvc;
@MockBean ProductService service;
@Test
void createProduct_validRequest_returns201() throws Exception {
var product = new Product(); product.setName("Widget"); product.setPrice(BigDecimal.TEN);
when(service.create(any())).thenReturn(product);
mockMvc.perform(post("/api/v1/products")
.contentType(MediaType.APPLICATION_JSON)
.content("""{"name":"Widget","price":10.0}"""))
.andExpect(status().isCreated())
.andExpect(jsonPath("$.name").value("Widget"));
}
}
Constraints
MUST DO
| Rule | Correct Pattern |
|---|---|
| Constructor injection | public MyService(Dep dep) { this.dep = dep; } |
| Validate API input | @Valid @RequestBody MyRequest req on every mutating endpoint |
| Type-safe config | @ConfigurationProperties(prefix = "app") bound to a record/class |
| Appropriate stereotype | @Service for business logic, @Repository for data, @RestController for HTTP |
| Transaction scope | @Transactional on multi-step writes; @Transactional(readOnly = true) on reads |
| Hide internals | Catch domain exceptions in @RestControllerAdvice; return problem details, not stack traces |
| Externalize secrets | Use environment variables or Spring Cloud Config — never application.properties |
MUST NOT DO
- Use field injection (
@Autowiredon fields) - Skip input validation on API endpoints
- Use
@Componentwhen@Service/@Repository/@Controllerapplies - Mix blocking and reactive code (e.g., calling
.block()inside a WebFlux chain) - Store secrets or credentials in
application.properties/application.yml - Hardcode URLs, credentials, or environment-specific values
- Use deprecated Spring Boot 2.x patterns (e.g.,
WebSecurityConfigurerAdapter)
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions
FAQ
What does the spring-boot-engineer skill do?
Generates Spring Boot 3.x configurations, creates REST controllers, implements Spring Security 6 authentication flows, sets up Spring Data JPA repositories, and configures reactive WebFlux endpoints. Use when building Spring Boot 3.x applications, microservices, or reactive Java applications; invoke for Spring Data JPA, Spring Security 6, WebFlux, Spring Cloud integration, Java REST API design, or Microservices Java architecture.
How do I install spring-boot-engineer?
Run npx skills add https://github.com/jeffallan/claude-skills --skill spring-boot-engineer in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/spring-boot-engineer/ (personal) or .claude/skills/spring-boot-engineer/ (project).
Which AI agents can use spring-boot-engineer?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is spring-boot-engineer safe to install?
Security partners have reviewed it: Gen Agent Trust Hub flagged risks; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains spring-boot-engineer?
It is published by jeffallan in jeffallan/claude-skills. It has 8,478 recorded installs.
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