If you want to use Moshi with Kotlin reflection you have to don’t forget to add KotlinJsonAdapterFactory. This will work fine I guess:

val moshi = Moshi.Builder()
    .add(KotlinJsonAdapterFactory())
    .build()
val jsonAdapter = moshi.adapter(BaseValidation::class.java)
val baseValidation = jsonAdapter.fromJson(response.errorBody()!!.charStream().toString())!!

also, you can remove @JsonClass annotation from your classes. It’s not needed for while you are using reflection.

Retrofit Instance:

    fun getMoshi() : Moshi{
        return Moshi.Builder()
            .add(KotlinJsonAdapterFactory())
            .build()
    }


    fun retrofit(baseUrl: String): Retrofit = Retrofit.Builder()
        .client(getClient())
        .baseUrl(baseUrl)
        .addConverterFactory(MoshiConverterFactory.create(getMoshi()).asLenient())
        .build()

}

BaseValidation model:

    @JsonClass(generateAdapter = true)
    data class BaseValidation (
        val status : String,
        val data : List<Data>
    )

response parsing:

   val type: Type = Types.newParameterizedType(String::class.java, Data::class.java)
    val moshi = Moshi.Builder().build()
    val jsonAdapter: JsonAdapter<Map<String,Data>> = moshi.adapter(type)
    val baseValidation = jsonAdapter.fromJson(response.errorBody()!!.charStream().toString())!!

results in:

Platform class java.lang.String in java.lang.String<com.example.vow.data_remote.model.create.response.validation.Data> requires explicit JsonAdapter to be registered

I am new to Moshi and kind of confused how to parse correctly, I’ve managed to achieve the result with gson using code below, but I want to learn how it’s done with Moshi:

val gson = Gson()
val type = object : TypeToken<BaseValidation>() {}.type
var errorResponse: BaseValidation? = gson.fromJson(response.errorBody()!!.charStream(), type)

is the Type below defined correctly?

val type: Type = Types.newParameterizedType(String::class.java, Data::class.java)

UPDATE

val moshi = Moshi.Builder().add(KotlinJsonAdapterFactory()).build()
val jsonAdapter: JsonAdapter<BaseValidation> = moshi.adapter(BaseValidation::class.java).lenient()
val baseValidation = jsonAdapter.fromJson(response.errorBody()!!.charStream().toString())!!

returns

com.squareup.moshi.JsonEncodingException: Use JsonReader.setLenient(true) to accept malformed JSON at path $

When moshi set to lenient() by

moshi.adapter(BaseValidation::class.java).lenient()

i get

Expected BEGIN_OBJECT but was STRING at path $

OkHttp response is

{
    "status": "validation",
    "data": [
        {
            "type": "Email",
            "code": 3000,
            "field": "User.contact.email",
            "message": "Email is invalid"
        }
    ]
}

SOLUTION

maybe it will help someone in the future

 response.errorBody()!!.charStream().toString()

instead should be

response.errorBody()?.source()