[BUG][Java/Spring] putX method calls superclass method with incorrect arguments

Created by: WeihmannTNG

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

Assume that there is a schema ChildClass which inherits via allOf from schema ParentClass with discriminator, and ParentClass has a property x which references a schema that is defined via additionalProperty. Then the overwritten putX builder method in ChildClass is broken.

openapi-generator version

6.0.0, 6.0.1-SNAPSHOT

OpenAPI declaration file content or url

    ChildClass:
      description: ""
      type: object
      allOf:
        - $ref: "#/components/schemas/ParentClass"
        - type: object
          description: ""
          properties:
            objectType:
              type: string
              default: "ChildClass"

    ParentClass:
      type: object
      description: ""
      discriminator:
        propertyName: objectType
      properties:
        objectType:
          type: string
          default: "ParentClass"
        someMap:
          $ref: "#/components/schemas/MapClass"

    MapClass:
      type: object
      description: ""
      additionalProperties:
        type: string
        description: ""

Generation Details

Using openapi-generator-maven-plugin with the following configuration

<plugin>
  <groupId>org.openapitools</groupId>
  <artifactId>openapi-generator-maven-plugin</artifactId>
  <version>6.0.1-SNAPSHOT</version>
  <configuration>
	  <generateApis>true</generateApis>
	  <generateModelTests>false</generateModelTests>
	  <generateApiTests>false</generateApiTests>
	  <configOptions>
		  <interfaceOnly>true</interfaceOnly>
		  <java8>true</java8>
		  <useTags>true</useTags>
		  <booleanGetterPrefix>is</booleanGetterPrefix>
		  <legacyDiscriminatorBehavior>false</legacyDiscriminatorBehavior>
		  <skipDefaultInterface>true</skipDefaultInterface>
	  </configOptions>
  </configuration>
  <executions>
	  <execution>
		  <id>generate-test-api</id>
		  <goals>
			  <goal>generate</goal>
		  </goals>
		  <configuration>
			  <output>${project.build.directory}/generated-sources</output>
			  <inputSpec>${project.basedir}/src/main/openapi/test.yaml</inputSpec>
			  <generatorName>spring</generatorName>
			  <modelPackage>dto</modelPackage>
			  <apiPackage>api</apiPackage>
			  <invokerPackage>invoker</invokerPackage>
		  </configuration>
	  </execution>
  </executions>
</plugin>

Steps to reproduce

Add the code at Generator Details to your pom and add the openapi code given above to some valid openapi file /src/main/openapi/test.yaml (I skipped parts of the yaml to keep it as succinct as possible).

The generated class ParentClass contains the following.

  public ParentClass putSomeMapItem(String key, String someMapItem) {
    if (this.someMap == null) {
      this.someMap = new HashMap<>();
    }
    this.someMap.put(key, someMapItem);
    return this;
  }

The generated class ChildClass contains the following.

  public ChildClass putSomeMapItem(String key, String someMapItem) {
    super.putSomeMapItem(someMapItem);
    return this;
  }

However, expected is the following.

  public ChildClass putSomeMapItem(String key, String someMapItem) {
    super.putSomeMapItem(key, someMapItem);
    return this;
  }

Related issues/PRs

I did not find any.