Kotlin Coroutines with Retrofit: Handling API Errors Gracefully in a Combined Flow
I'm trying to implement I'm stuck on something that should probably be simple... I've been struggling with this for a few days now and could really use some help. I'm currently working on a Kotlin application using coroutines and Retrofit to handle API calls. I have a `Flow` that combines multiple API requests, but I'm struggling with how to handle errors gracefully without crashing the flow or missing updates. My current implementation looks like this: ```kotlin class MyRepository(private val apiService: ApiService) { fun fetchData(): Flow<Result<MyData>> = flow { val data1 = apiService.getData1() // Suspend function val data2 = apiService.getData2() // Suspend function emit(Result.success(MyData(data1, data2))) }.catch { e -> emit(Result.failure(e)) } } ``` In the above code, the `catch` block is supposed to emit a failure result if any API call fails. However, when I test it with a failing API endpoint, the flow seems to terminate and I don't get the failure result in my UI, leading to a `KotlinNullPointerException` when I try to access the results. I've tried wrapping the individual API calls in `try-catch` blocks, but it doesn't seem to help. How can I ensure that even if one API call fails, I still receive a proper failure result rather than terminating the flow completely? I'm using Retrofit 2.9.0 and Kotlin Coroutines 1.6.0. Any best practices or examples on how to handle such cases would be greatly appreciated! For context: I'm using Kotlin on Ubuntu. For context: I'm using Kotlin on Linux. Any ideas what could be causing this? I'm working in a Ubuntu 20.04 environment. I'm working with Kotlin in a Docker container on Ubuntu 22.04.