Affects: <Spring Framework 6.1.8 and maybe other versions>

I write a simple demo below, I write a Controller with a handler method receiving a post request and consume a valid request body

@RestController
class Controller {
    @PostMapping("/test")
    fun test(@RequestBody @Valid foo: Foo) {
        println(foo)
    }

    @ExceptionHandler(Exception::class)
    fun handleException(e: Exception) {
        println(e)
    }
}

data class Foo(
    @field:NotEmpty
    val name: String
)

Then I send a post request with this body to the application.

{
  "name": ""
}

Check out the console and you can see a exception printed and it's type is WebExchangeBindException
But according to the spring document validation, it should throw a MethodArgumentNotValidException.

I also test this behavior in mvc and it's the expected exception.