Kotlin 为什么在jacksonObjectMapper上将DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES设置为false无效

我想将Jackson配置为通过映射器而不是注释忽略未知属性，但我无法使其工作.这是一个不及格的测试.它应该会通过，因为我已经将映射器配置为忽略未知属性，但它失败了，因为json包含未知属性(Make).第二个测试使用注释通过.

package paul.demo.training

import com.fasterxml.jackson.annotation.JsonIgnoreProperties
import com.fasterxml.jackson.databind.DeserializationFeature
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.shouldBe



class JsonIgnore: FunSpec({

    test("Mapper should ignore unknown properties - mapper") {

        data class Car(val colour : String)
        val json = """
            { "colour" : "Red",
              "make" : "Ford"
            }
        """.trimIndent()

        val mapper = jacksonObjectMapper().configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES,false)

        val car = mapper.readValue(json,Car::class.java)

        car.colour shouldBe "Red"
    }

    test("Mapper should ignore unknown properties - annotation") {
        @JsonIgnoreProperties(ignoreUnknown = true)
        data class Car(val colour : String)
        val json = """
            { "colour" : "Red",
              "make" : "Ford"
            }
        """.trimIndent()

        val mapper = jacksonObjectMapper().configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES,false)

        val car = mapper.readValue(json,Car::class.java)

        car.colour shouldBe "Red"
    }
})