Request Object Parameter is no longer required after upgrade to 3.0.0

[karenmillermoj]

Describe the bug

After upgrading from 2.8.14 to 3.0.0, Kotlin data class request object parameters that were previously correctly marked as required are no longer mandatory.

To Reproduce
Steps to reproduce the behavior:

What version of spring-boot you are using?
4.0.0
What modules and versions of springdoc-openapi are you using?
springdoc-openapi-starter-webmvc-ui:3.0.0

Provide with a sample code (HelloController) or Test that reproduces the problem

Controller

import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RestController

@RestController
class HelloController {

  @GetMapping("/hello")
  fun getFoo(tester: Tester): String = "Ok"
}

data class Tester(
  val strOne: String,
)

Expected behavior

      "Tester": {
        "type": "object",
        "properties": {
          "strOne": {
            "type": "string"
          }
        },
        "required": [
          "strOne"
        ]
      },

Actual behavior

      "Tester": {
        "type": "object",
        "properties": {
          "strOne": {
            "type": "string"
          }
        }
      },

[lruizctaima]

We are experiencing the same problem. Our TypeScript generator is generating everything as optional where previously was working fine.

[karenmillermoj]

Closed due to removing implementation("com.fasterxml.jackson.module:jackson-module-kotlin") from build file as didn't think it was required anymore due to SB4 using Jackson 3. springdocs (under the covers) still uses Jackson2 - so is still required

[petergphillips]

See https://github.com/petergphillips/springdoc-required-params/tree/spring-boot-4 for an example project showing that springdoc 3.0 is working as required.
Note that taking out

  implementation("com.fasterxml.jackson.module:jackson-module-kotlin")

from the build.gradle.kts then breaks the tests.