👀 Views: 57 💬 Answers: 1 📅 Created: 2025-07-22

android retrofit coroutines Kotlin

This might be a silly question, but I'm working with a frustrating scenario where my Retrofit API calls return a successful response but still throw an Unhandled exception in my behavior handling code. I've implemented a custom behavior handler using OkHttp's interceptor to log errors, and I expected this to work seamlessly. However, when I receive a `404 Not Found`, my app crashes with `java.lang.IllegalStateException: Unexpected code 404`. Here's the relevant section of my Retrofit setup: ```kotlin val client = OkHttpClient.Builder() .addInterceptor { chain -> val response = chain.proceed(chain.request()) if (!response.isSuccessful) { // Log the behavior response Log.e("API behavior", "Code: ${response.code}, Message: ${response.message}") throw IOException("API behavior: ${response.code}") } response } .build() val retrofit = Retrofit.Builder() .baseUrl("https://api.example.com/") .client(client) .addConverterFactory(GsonConverterFactory.create()) .build() val apiService = retrofit.create(ApiService::class.java) ``` The question arises when I try to handle this behavior in my ViewModel using coroutines. Here's how I'm calling the API: ```kotlin viewModelScope.launch { try { val response = apiService.getData() // Process the response } catch (e: Exception) { // Handle the exception Log.e("ViewModel behavior", "${e.message}") } } ``` I've tried wrapping the API call in additional try-catch blocks and ensuring that the `apiService.getData()` function is correctly annotated with `@GET`, but the exception continues to propagate and crash the app instead of being caught in my coroutine. I've also checked that my gradle dependencies are up to date: ```groovy implementation 'com.squareup.retrofit2:retrofit:2.9.0' implementation 'com.squareup.retrofit2:converter-gson:2.9.0' implementation 'com.squareup.okhttp3:logging-interceptor:4.9.3' ``` Is there something I'm missing in how Retrofit handles responses, or is there a better way to manage errors in this setup? Any insights would be greatly appreciated! I'm on CentOS using the latest version of Kotlin. Could this be a known issue?