[BUG][Warning] [Java] [WebClient] BodyInserters.fromObject is deprecated since Spring 5.2

Created by: kelianClerc

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

Since Spring 5.2, BodyInserters.fromObject method has been deprecated. It is recommended to use BodyInserters.fromValue instead : see ref

BodyInserters.fromObject is used in ApiClient's selectBody method :

https://github.com/OpenAPITools/openapi-generator/blob/f19f7064bed355269f5e9c8a585afb9537ebef20/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache#L495-L517

This leads to a warning during code generation :

[WARNING] COMPILATION WARNING : [INFO] ------------------------------------------------------------- [WARNING] .../src/gen/java/main/org/openapitools/client/ApiClient.java:[483,47] fromObject(T) in org.springframework.web.reactive.function.BodyInserters has been deprecated

openapi-generator version

5.0.0

OpenAPI declaration file content or url

Input file doesn't matter here

Generation Details


<configuration>
    <generatorName>java</generatorName>
    <configOptions>
        <sourceFolder>src/gen/java/main</sourceFolder>
        <java8>true</java8>
        <dateLibrary>java8</dateLibrary>
        <library>webclient</library>
        <openApiNullable>false</openApiNullable>
    </configOptions>
</configuration>

Steps to reproduce

run openapi-generator 5.0.0 with specified generation details

Related issues/PRs

none

Suggest a fix

Replacing :


return obj != null ? BodyInserters.fromObject(obj) : null;

by :


return obj != null ? BodyInserters.fromValue(obj) : null;