[BUG] [java] [spring] Type-less parameters in generated model method

[flozano]

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Generated models omit type in a method parameter:

> Task :compileJava FAILED
/Users/flozano/Projects/java/reproduce-openapi-issue/build/generated/src/main/java/io/github/flozano/openapireproduce/model/UserNew.java:102: error: <identifier> expected
  public UserNew putRoleItem(String key,  roleItem) {
                                                  ^
/Users/flozano/Projects/java/reproduce-openapi-issue/build/generated/src/main/java/io/github/flozano/openapireproduce/model/UserNew.java:150: error: <identifier> expected
  public UserNew putAlertMethodItem(String key,  alertMethodItem) {
                                                                ^
2 errors

full reproducer project in https://github.com/flozano/reproduce-openapi-spring-issue/

openapi-generator version

7.10.0

OpenAPI declaration file content or url

https://github.com/flozano/reproduce-openapi-spring-issue/blob/master/src/main/resources/swagger-testing.yaml

Generation Details

most simple gradle configuration possible:

plugins {
    id "org.openapi.generator" version "${openApiGeneratorVersion}"
    id 'java'
}

openApiGenerate {
    generatorName = "spring"
    inputSpec = "${project.projectDir}/src/main/resources/swagger-testing.yaml".toString()
    outputDir = "${project.buildDir}/generated".toString()
    skipOverwrite = false
}

Steps to reproduce

just run ./gradlew build in the reproducer project https://github.com/flozano/reproduce-openapi-spring-issue/

Incorrect output details

A method like this is generated in the model:

  private Object role;

// ...
  public UserNew putRoleItem(String key,  roleItem) {
    if (this.role == null) {
      this.role = new HashMap<>();
    }
    this.role.put(key, roleItem);
    return this;
  }

role is in a definition like this:

  Role:
    type: string
    enum:
      - admin
      - technician
      - observer

and used like this in the definition that generates the offending class:

      role:
        allOf:
          - description: if role is omitted, `"technician"` is used as default.
          - $ref: '#/definitions/Role'