[BUG] Generated Kotlin client do not work with Spring Boot 4

[rupert-jung-mw]

Description

Generator creates code like this:

 protected inline fun <reified I : Any, reified T: Any?> request(requestConfig: RequestConfig<I>): ResponseEntity<T> {
        return prepare(defaults(requestConfig))
            .retrieve()
            .toEntity(object : ParameterizedTypeReference<T>() {})
 }

This code das not compile anymore in Spring Web 7 (used by Spring Boot 3):

None of the following candidates is applicable:
fun <T : Any> toEntity(bodyType: Class<T>): ResponseEntity<T>
fun <T : Any> toEntity(bodyType: ParameterizedTypeReference<T>): ResponseEntity<T>`

Propsed solution

It should be enough to change the outer bounds from Any? to Any like this:

    protected inline fun <reified I : Any, reified T: Any> request(requestConfig: RequestConfig<I>): ResponseEntity<T> {
        return prepare(defaults(requestConfig))
            .retrieve()
            .toEntity(object : ParameterizedTypeReference<T>() {})
    }

openapi-generator version

7.17.0

[sgerke-1L]

This might be a duplicate of https://github.com/OpenAPITools/openapi-generator/issues/22368

[hiddewie]

I am working on a PR that changes Any? to Any in https://github.com/OpenAPITools/openapi-generator/pull/22421