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Showing content from https://github.com/OpenAPITools/openapi-generator/issues/9981 below:

[BUG] [Spring] OneOf base class not generated · Issue #9981 · OpenAPITools/openapi-generator · GitHub

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• Have you validated the input using an OpenAPI validator (example)?
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While generating a Java server code with polymorphism (oneOf), we get a compilation error while the base class is imported due to it was not generated.

5.2.0

openapi: 3.0.0
info:
  title: OneOf example
  version: '1.0.0'
paths:
  '/vegetables':
    get:
      summary: Get vegetables
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                oneOf:
                - $ref: '#/components/schemas/Tomato'
                - $ref: '#/components/schemas/Carrot'
        '404':
          description: Not Found
      operationId: getVegetables
components:
  schemas:
    Tomato:
      type: object
      properties:
        property1:
          type: integer
        property2:
          type: string
    Carrot:
      type: object
      properties:
        property3:
          type: integer
        property4:
          type: string  

Plugin configuration:

<plugin>
	<version>5.2.0</version>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <executions>
        <execution>
            <id>generate-rest-api</id>
            <goals>
                <goal>generate</goal>
            </goals>
            <phase>generate-sources</phase>
            <configuration>
                <inputSpec>${project.basedir}/src/main/resources/openapi-rest.yml</inputSpec>
                <generatorName>spring</generatorName>
                <generateSupportingFiles>true</generateSupportingFiles>                
                <configOptions>
                    <dateLibrary>java8</dateLibrary>
                    <java8>true</java8>
                    <interfaceOnly>true</interfaceOnly>
                    <apiPackage>com.example</apiPackage>                    
                    <modelPackage>com.example.dto</modelPackage>
                    <sourceFolder>src/gen/java/main</sourceFolder>                    
                </configOptions>
            </configuration>
        </execution>       
    </executions>    
</plugin>

Generate code with openapi-generator-maven-plugin.

• Add the openapi-generator-maven-plugin to a pom.xml
• Add the previous OpenAPI to a file named openapi-rest.yml at ${project.basedir}/src/main/resources/
• Execute mvn clean compile
• Check the compilation error at DefaultApi.java file. It's trying to import a OneOfTomatoCarrot, but it has not been generated.

• [Spring][server] oneOf Polymorphism support for spring boot #5661
• [BUG] [spring][server] oneOf Polymorphism support for spring boot #5381

Following the provided example, a OneOfTomatoCarrot class must be generated.

MikhailovNikita, kondei, redamessoudi and LeComptoirDesPharmacies

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