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openapi-first

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1---2name: openapi-first3description: >4---56# skills/spring-boot-3/openapi-first/SKILL.md

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SKILL.md

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1Install this skill: https://github.com/rrezartprebreza/spring-boot-skills/tree/HEAD/skills/spring-boot-3/openapi-first

Download skill skills/spring-boot-3/openapi-first/SKILL.md on GitHub

skills/spring-boot-3/openapi-first/SKILL.mdMarkdown · UTF-8

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File: skills/spring-boot-3/openapi-first/SKILL.md
Publisher: rrezartprebreza
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SKILL.md

name: openapi-first
description: Use when the project follows API-first / OpenAPI-first approach: generating controller interfaces, DTOs, and clients from an OpenAPI spec. Use when you see openapi.yaml, openapi-generator-maven-plugin, or ApiDelegate pattern in the project.

OpenAPI-First Development

Maven Plugin Setup

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>7.5.0</version>
    <executions>
        <execution>
            <goals><goal>generate</goal></goals>
            <configuration>
                <inputSpec>${project.basedir}/src/main/resources/openapi.yaml</inputSpec>
                <generatorName>spring</generatorName>
                <apiPackage>com.example.api</apiPackage>
                <modelPackage>com.example.api.model</modelPackage>
                <configOptions>
                    <delegatePattern>true</delegatePattern>      
                    <interfaceOnly>false</interfaceOnly>
                    <useSpringBoot3>true</useSpringBoot3>
                    <useTags>true</useTags>
                    <dateLibrary>java8</dateLibrary>
                    <openApiNullable>false</openApiNullable>
                    <skipDefaultInterface>false</skipDefaultInterface> 
                </configOptions>
                
                <supportingFilesToGenerate>ApiUtil.java</supportingFilesToGenerate>
                <modelNameSuffix>Dto</modelNameSuffix> 
                <output>${project.build.directory}/generated-sources/openapi</output>
            </configuration>
        </execution>
    </executions>
</plugin>

OpenAPI Spec Example

# src/main/resources/openapi.yaml
openapi: 3.0.3
info:
  title: Order Service API
  version: 1.0.0

paths:
  /api/v1/orders:
    post:
      tags: [Orders]
      operationId: createOrder
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateOrderRequest'
      responses:
        '201':
          description: Order created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OrderResponse'
        '400':
          $ref: '#/components/responses/ValidationError'

    get:
      tags: [Orders]
      operationId: listOrders
      parameters:
        - name: page
          in: query
          schema: { type: integer, default: 0 }
        - name: size
          in: query
          schema: { type: integer, default: 20 }
      responses:
        '200':
          description: Paginated orders
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OrderPage'

components:
  schemas:
    CreateOrderRequest:
      type: object
      required: [customerEmail, items]
      properties:
        customerEmail:
          type: string
          format: email
        items:
          type: array
          minItems: 1
          items:
            $ref: '#/components/schemas/OrderItemRequest'

    OrderResponse:
      type: object
      properties:
        id:
          type: string
          format: uuid
        status:
          type: string
          enum: [PENDING, PROCESSING, SHIPPED, DELIVERED, CANCELLED]
        customerEmail:
          type: string
        createdAt:
          type: string
          format: date-time

    OrderItemRequest:
      type: object
      required: [productId, quantity]
      properties:
        productId:
          type: string
          format: uuid
        quantity:
          type: integer
          minimum: 1

    OrderPage:
      type: object
      properties:
        content:
          type: array
          items:
            $ref: '#/components/schemas/OrderResponse'
        page:
          type: integer
        size:
          type: integer
        totalElements:
          type: integer
          format: int64

    ApiError:
      type: object
      properties:
        code:
          type: string
        message:
          type: string
        details:
          type: array
          items:
            type: string

  responses:
    ValidationError:
      description: Validation failed
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'

// Generated: OrdersApi interface with delegate
// Your implementation — never modify generated files

@Service
@RequiredArgsConstructor
public class OrdersApiDelegateImpl implements OrdersApiDelegate {

    private final OrderService orderService;

    @Override
    public ResponseEntity<OrderResponse> createOrder(CreateOrderRequest request) {
        Order order = orderService.createOrder(request);
        return ResponseEntity.status(HttpStatus.CREATED)
            .body(OrderApiMapper.toResponse(order));
    }

    @Override
    public ResponseEntity<OrderPage> listOrders(Integer page, Integer size) {
        Page<Order> orders = orderService.findAll(PageRequest.of(page, size));
        return ResponseEntity.ok(OrderApiMapper.toPage(orders));
    }
}

target/generated-sources/openapi/

openapi-first

Install

Skill facts

Questions

How do I install openapi-first?

Where does openapi-first live?

Which agents can use openapi-first?

SKILL.md

OpenAPI-First Development

Maven Plugin Setup

OpenAPI Spec Example

Implementing the Delegate

.gitignore — Never Commit Generated Files

Gotchas