Retrofit 2 - Response body null when response status is 422 (unprocessable entity)

Question

I\'m using Retrofit to make a POST Request in my web server.

However, I can\'t seem to get the response body when the response status is 422 (unprocessable entit

Answer 1

Well in this case you'll have to convert the response. Have a look at this link

All the steps are already provided in the link above.

For Kotlin users here is the code solution.

ErrorResponse.kt (This obviously depends on your error response)

import com.squareup.moshi.Json

data class ErrorResponse(

@Json(name="name")
val name: String? = null,

@Json(name="message")
val message: String? = null,

@Json(name="errors")
val errors: Errors? = null,

@Json(name="statusCode")
val statusCode: Int? = null
)

ApiFactory.kt (Let me know if you need the entire code)

fun parseError(response: Response<*>): ErrorResponse {
    val converter = ApiFactory.retrofit()
            .responseBodyConverter(
                    ErrorResponse::class.java, arrayOfNulls(0)
            )

    val error: ErrorResponse

    try {
        error = converter.convert(response.errorBody()!!)!!
    } catch (e: IOException) {
        e.printStackTrace()
        return ErrorResponse()
    }

    return error
}

and in the Presenter (I use MVP)

GlobalScope.launch(Dispatchers.Main) {
        try {
            val response = ApiFactory.apiService.LOGIN(username, password)
                    .await()
            val body = response.body()
            body?.let {
            // Handle success or any other stuff
                if (it.statusCode == 200) {
                    mView.onSuccess(it.data!!)
                }
            } ?:
            // This is the else part where your body is null
            // Here is how you use it.
            // Pass the response for error handling
            mView.showMessage(ApiFactory.parseError(response).message!!)
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }

And thats how you roll it! That's All Folks!