springdoc-openapi-starter-webmvc-ui 2.8.3 does not generate "required" properties

[gertjanschouten]

Since upgrading to springdoc-openapi-starter-webmvc-ui 2.8.3 (in combination with spring boot 3.4.1), properties are no longer marked as "required" in the generated openapi spec. All properties are still there, it's just that the entire "requires" list of required properties is no longer there.

For example, in 2.7.0, you would get this:

      "MyObject": {
        "type": "object",
        "properties": {
          "property1": {
            "type": "string"
          },
          "property2": {
            "type": "string",
            "format": "uuid"
          }
        },
        "required": [
          "property1"
        ]
      }

Then, in 2.8.3, it becomes this:

      "MyObject": {
        "type": "object",
        "properties": {
          "property1": {
            "type": "string"
          },
          "property2": {
            "type": "string",
            "format": "uuid"
          }
        }
      }

We had to revert to 2.7.0 for the time being.

[Mattias-Sehlstedt]

Could you provide an example of how the model looks in code?

[gertjanschouten]

data class MyObject(
  val property1: String,
  val property2: UUID?
)

So basically, it relies on Kotlin's nullable syntax. Sorry, I didn't mention this before, I forgot :) This always used to work up until 2.7.0

[Mattias-Sehlstedt]

Thanks for the added details. I have unfortunately myself only used Java together with explicit annotations that state whether a field is required or not.

But hopefully the additional details that you have provided should be enough for someone to investigate the issue.