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[BUG][KOTLIN] Fails to compile after updating to 7.25.0 with useJackson3=false useSpringBoot4=true

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新手友好度
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Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
kotlin, spring-boot
领域
tooling

调研方向

从报告中显示的生成的 Serializer.kt 开始，使用提供的 Gradle 选项比较 7.24.0 与 7.25.0 的生成结果。阅读相关 issue 或 PR #24709 中的更改和讨论，然后验证 useJackson3=false 会生成 com.fasterxml.jackson 导入，并验证生成的源代码可以使用 Spring Boot 4 和 Jackson 2 编译。

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描述

Issue: Bug
Bug Report Checklist
  • Have you provided a full/minimal spec to reproduce the issue?
  • Have you validated the input using an OpenAPI validator?
  • 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

7.25.0 breaks backward compatibility, by force-setting useJackson3=true for Spring 4 and jvm-spring-restclient

It's incorrect to enforce Jackson 3 with those settings: Spring 4.0 and 4.1 work with Jackson 2, it's just deprecated. RestClient still works with Jackson 2.

openapi-generator version

7.25.0, it's a regression compared to 7.24.0

OpenAPI declaration file content or url
Generation Details

See 'steps to reproduce'

Steps to reproduce

I only generate sources and use my own build.gradle.kts, throwing away generator's one.

dependencies {
    api(platform("org.springframework.boot:spring-boot-dependencies:4.0.8"))

    api("org.springframework:spring-web")

    // api because Serializer.jacksonObjectMapper is public
    api("com.fasterxml.jackson.core:jackson-databind")
    api("org.openapitools:jackson-databind-nullable:0.2.11")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
}

openApiGenerate {
    configOptions.set(
        mapOf(
            "omitGradleWrapper" to "true",
            "library" to "jvm-spring-restclient",
            "useSpringBoot3" to "true",
            "useSpringBoot4" to "true",
            "useJackson3" to "false",
            "serializationLibrary" to "jackson",
        )
    )
}

What complied with 7.24.0, fails to compile in 7.25.0 because Serializer.kt is now:


import tools.jackson.databind.DeserializationFeature
import tools.jackson.databind.json.JsonMapper
import tools.jackson.databind.cfg.DateTimeFeature
import com.fasterxml.jackson.annotation.JsonInclude
import tools.jackson.module.kotlin.jsonMapper
import tools.jackson.module.kotlin.kotlinModule

object Serializer {
    @JvmStatic
    val jacksonObjectMapper: JsonMapper = jsonMapper {
        addModule(kotlinModule())
        changeDefaultPropertyInclusion { it.withValueInclusion(JsonInclude.Include.NON_ABSENT) }
        disable(DateTimeFeature.WRITE_DATES_AS_TIMESTAMPS)
        disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
    }
}

Because I explicitly set useJackson3=false, the generated code should import com.fasterxml.jackson

Related issues/PRs

#24709

Suggest a fix

Remove the addition of setUseJackson3(true) as pointed out in https://github.com/OpenAPITools/openapi-generator/pull/24709/changes#r3917417022

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