OpenAPI Java Generator

OpenAPI Java Client Generator

Uses the openapi-codegen and openapi-to-plantuml java libraries to generate a Java 8+ SDK client project (with source code, operation class diagrams and Maven pom.xml) for the given OpenAPI 3.0 definition. This website source is here. Any issues can be raised at the appropriate one of those GitHub projects.

Version: 0.2.21

The OpenAPI input is limited to about 7MB when you paste the definition into the box below. If you paste a public url for the definition there is no limit.

Set the GroupId, ArtifactId, Version and Base Package to your liking and click the Generate button.
If the generation does not finish within 30s you will get an error page. Untick Generate PUML and try again.
The returned zip file has this structure:

pom.xml
src/main/java/...
src/main/plantuml/...
README.md

Unzip the file to a directory, cd into that directory
If an error occurs an error.log file will be in the directory
Run mvn clean install. This action will build a jar in target directory and also generate PNG and SVG images for each service operation from the plantuml source into target/generated-images
If you run mvn clean install -P docs then the images and index.md file will be generated into src/docs/images instead. The root README.md contains a link to the images in that location.
Once the zip file is downloaded, this bash command will check the code compiles and then opens the images folder:

rm -rf /tmp/client && unzip ~/Downloads/client.zip -d /tmp/client && cd /tmp/client && mvn clean install -P docs && (find . -name "*.png"|xargs eog --fullscreen)

GroupId:
ArtifactId:
Version:
Base Package:
Generate PUML:

Try these:

Apache AirFlow, Clickmeter, Twitter, Telegram, Xero Accounting, Maritime Safety Information, Unqork, Marqueta, Stripe, AWS S3

OpenAPI definition (YAML or JSON), or url of YAML file on the public web:

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
  description: A sample API that uses a petstore as an example to demonstrate features in the OpenAPI 3.0 specification
  termsOfService: http://swagger.io/terms/
  contact:
    name: Swagger API Team
    email: apiteam@swagger.io
    url: http://swagger.io
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0.html
servers:
  - url: http://petstore.swagger.io/api
paths:
  /pets:
    get:
      description: |
        Returns all pets from the system that the user has access to
        Nam sed condimentum est. Maecenas tempor sagittis sapien, nec rhoncus sem sagittis sit amet. Aenean at gravida augue, ac iaculis sem. Curabitur odio lorem, ornare eget elementum nec, cursus id lectus. Duis mi turpis, pulvinar ac eros ac, tincidunt varius justo. In hac habitasse platea dictumst. Integer at adipiscing ante, a sagittis ligula. Aenean pharetra tempor ante molestie imperdiet. Vivamus id aliquam diam. Cras quis velit non tortor eleifend sagittis. Praesent at enim pharetra urna volutpat venenatis eget eget mauris. In eleifend fermentum facilisis. Praesent enim enim, gravida ac sodales sed, placerat id erat. Suspendisse lacus dolor, consectetur non augue vel, vehicula interdum libero. Morbi euismod sagittis libero sed lacinia.

Sed tempus felis lobortis leo pulvinar rutrum. Nam mattis velit nisl, eu condimentum ligula luctus nec. Phasellus semper velit eget aliquet faucibus. In a mattis elit. Phasellus vel urna viverra, condimentum lorem id, rhoncus nibh. Ut pellentesque posuere elementum. Sed a varius odio. Morbi rhoncus ligula libero, vel eleifend nunc tristique vitae. Fusce et sem dui. Aenean nec scelerisque tortor. Fusce malesuada accumsan magna vel tempus. Quisque mollis felis eu dolor tristique, sit amet auctor felis gravida. Sed libero lorem, molestie sed nisl in, accumsan tempor nisi. Fusce sollicitudin massa ut lacinia mattis. Sed vel eleifend lorem. Pellentesque vitae felis pretium, pulvinar elit eu, euismod sapien.
      operationId: findPets
      parameters:
        - name: tags
          in: query
          description: tags to filter by
          required: false
          style: form
          schema:
            type: array
            items:
              type: string
        - name: limit
          in: query
          description: maximum number of results to return
          required: false
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: pet response
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Pet'
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    post:
      description: Creates a new pet in the store. Duplicates are allowed
      operationId: addPet
      requestBody:
        description: Pet to add to the store
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/NewPet'
      responses:
        '200':
          description: pet response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Pet'
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /pets/{id}:
    get:
      description: Returns a user based on a single ID, if the user does not have access to the pet
      operationId: find pet by id
      parameters:
        - name: id
          in: path
          description: ID of pet to fetch
          required: true
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: pet response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Pet'
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    delete:
      description: deletes a single pet based on the ID supplied
      operationId: deletePet
      parameters:
        - name: id
          in: path
          description: ID of pet to delete
          required: true
          schema:
            type: integer
            format: int64
      responses:
        '204':
          description: pet deleted
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Pet:
      allOf:
        - $ref: '#/components/schemas/NewPet'
        - $ref: '#/components/schemas/PetId'
        
    PetId:
      type: object
      properties:
        id:
          type: integer
          format: int64
      required:
        - id

NewPet:
      type: object
      required:
        - name  
      properties:
        name:
          type: string
        tag:
          type: string

Error:
      type: object
      required:
        - code
        - message
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string