使い方
- インストールコマンドをコピーし、自分の環境へ導入する前にソースを確認します。
- 必要なツール、認証情報、対応環境を原文で確認します。
- 入力と成果物を指定し、出力を資料と照合します。
npx skills add https://github.com/jeffallan/claude-skills --skill spring-boot-engineer開始前の確認
- 導入にはモデル契約、API枠、ファイルへのアクセス許可は含まれません。
- スター数や導入数は活動の指標であり、独立した品質・安全性試験ではありません。
リポジトリの原文
見出し、例、コード、表、リンク、参照画像を含む原文を表示しています。
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
java
@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
java
public interface ProductRepository extends JpaRepository<Product, Long> {
List<Product> findByNameContainingIgnoreCase(String name);
}Service (constructor injection)
java
@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
java
@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)
java
public record ProductRequest(
@NotBlank String name,
@DecimalMin("0.0") BigDecimal price
) {}Global Exception Handler
java
@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
java
@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
