杰克逊转换器空请求主体的改造

Question

我无法通过Jackson转换器进行翻新发布数据。请求正文始终为空。

这是我的代码。通话方式：

@POST("mood")
fun getMoods(@Body body: MoodsRequestBody): Call<List<String>>

请求正文类：

internal data class MoodsRequestBody(val userId: String, val thought: String)

Api实例：

private val client = OkHttpClient.Builder()
        .apply {
            if (BuildConfig.DEBUG) addInterceptor(CurlLoggingInterceptor())
        }
        .build()

private val mapper = jacksonObjectMapper()
        .disable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES,
                 DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,
                 DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
        .enable(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT,
                DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT)
        .setSerializationInclusion(JsonInclude.Include.NON_NULL)
        .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)

private val retrofit = Retrofit.Builder()
        .baseUrl("http://<base url here>")
        .client(client)
        .addConverterFactory(JacksonConverterFactory.create(mapper))
        .build()

private val api: Api = retrofit.create(Api::class.java)

这是我在日志中得到的卷曲：

curl -X POST --data $'{}' "http://<base url here>/mood"

如您所见，请求的主体为空。我认为它没有被序列化。请帮助。