[BUG] [JAVA] [7.0.0] Fluent setters generated for readOnly properties

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? Don't generate the fluentd setter method
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Generated code is not compiling because

  @JsonCreator
  public Child(
    @JsonProperty(JSON_PROPERTY_ID) String id
  ) {
    this();
    this.id = id;  // id is private in the class 'Parent' + being readonly the setter shouldn't be generated
  }

The bug seems a consequence of https://github.com/OpenAPITools/openapi-generator/issues/14915.

openapi-generator version

7.0.0

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: test
  description: test schema
  version: 1.0.0
servers:
  - url: 'http://test.com'
    description: stage
paths:
  /demo:
    get:
      summary: placeholder summary
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Child'
components:
  schemas:
    Parent:
      type: object
      properties:
        id:
          type: string
          readOnly: true
        name:
          type: string
    Child:
      allOf:
        - $ref: '#/components/schemas/Parent'
        - type: object
          properties:
            childProperty:
              type: string

Generation Details

    <build>
        <plugins>
            <plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>7.0.0</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>${project.basedir}/src/main/resources/readonly-openapi.yaml</inputSpec>
                            <generatorName>java</generatorName>
                            <library>resttemplate</library>
                            <openapiNormalizer>REF_AS_PARENT_IN_ALLOF=true</openapiNormalizer>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

Steps to reproduce

Generate source code with java generator (library resttemplateor other) and setting openapiNormalizer to REF_AS_PARENT_IN_ALLOF=true to force that the first schema of allOf is used as the parent class.

Related issues/PRs

N/A

Suggest a fix

In Java/pojo.mustache probably check for vars not being readonly.

  {{#parent}}
  {{#allVars}}
  {{#isOverridden}}{{! START FIX }}{{^isReadOnly}}{{! END FIX }}
  @Override
  public {{classname}} {{name}}({{{datatypeWithEnum}}} {{name}}) {
    {{#vendorExtensions.x-is-jackson-optional-nullable}}
    this.{{setter}}(JsonNullable.<{{{datatypeWithEnum}}}>of({{name}}));
    {{/vendorExtensions.x-is-jackson-optional-nullable}}
    {{^vendorExtensions.x-is-jackson-optional-nullable}}
    this.{{setter}}({{name}});
    {{/vendorExtensions.x-is-jackson-optional-nullable}}
    return this;
  }

  {{! START FIX }}{{/isReadOnly}}{{! END FIX }}{{/isOverridden}}
  {{/allVars}}
  {{/parent}}

Start with Java/pojo.mustache and reproduce the issue using the supplied OpenAPI declaration, the Java generator, and REF_AS_PARENT_IN_ALLOF=true. Check the generated Child code for fluent setters on readOnly inherited properties; done means the generated source compiles without those setters while writable properties retain their expected setters.