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[BUG] [Java] Invalid code generation for oneof types.

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#### Bug Report Checklist - [x] Have you provided a full/minimal spec to reproduce the issue? - [x] Have you validated the input using an OpenAPI validator ([example](https://apidevtools.org/swagger-parser/online/))? - [x]...

[BUG] [Java] Invalid code generation for oneof types.

4

Fixes #18517, Gradle builds work again using the test file: https://gist.github.com/Bethibande/c97b0b64e3dc284c056c02fbf3778a9b ### PR checklist - [x] Read the [contribution guidelines](https://github.com/openapitools/openapi-generator/blob/master/CONTRIBUTING.md). - [x] Pull Request title clearly describes the work in...

#### Bug Report Checklist - [x] Have you provided a full/minimal spec to reproduce the issue? - [x] Have you validated the input using an OpenAPI validator ([example](https://apidevtools.org/swagger-parser/online/))? - [x]...

#### Bug Report Checklist - [x] Have you provided a full/minimal spec to reproduce the issue? - [x] Have you validated the input using an OpenAPI validator ([example](https://apidevtools.org/swagger-parser/online/))? - [x]...

This PR fixes a compilation error that appears in generated oneOf and anyOf classes using the okhttp-gson library. A more detailed explanation can be found in the issue description: #18548...