Kotlin Coroutine Future Await with Timeout (No Cancellation) – Error Solution Guide

Error Overview

The error message “Kotlin coroutine future await with timeout (no cancellation)” typically arises when working with Kotlin coroutines and CompletableFuture. This error indicates that there is an issue related to awaiting the completion of a future with a specified timeout, without handling the cancellation of the coroutine properly. This can lead to unexpected behavior in your application, such as unresponsive states or resource leaks.

Common Causes

Several factors may contribute to this error, including:

1. Improper Usage of CompletableFuture: Failing to account for cancellation or timeout when using CompletableFuture can lead to errors.
2. Coroutine Scope Issues: Using a global scope can lead to memory leaks or unexpected behaviors, as it does not manage the lifecycle of coroutines effectively.
3. Missing Coroutine Context: Not specifying the appropriate coroutine context can result in failed coroutine executions.
4. Incorrect Timeout Handling: Implementing timeout logic without proper synchronization can yield inaccurate results.
5. Blocking Calls: Mixing blocking calls with coroutines can lead to deadlocks or performance issues.

Solution Methods

To resolve the error “Kotlin coroutine future await with timeout (no cancellation)”, several methods can be employed. The following methods outline practical steps to address the issue.

Method 1: Implementing a Timeout Function

One effective way to handle timeouts with CompletableFuture is by creating a custom await function. Below are the step-by-step instructions to implement this solution.

1. Define the Custom Await Function:
   Create a suspend function that extends CompletableFuture. This function will manage the timeout logic.

“`kotlin
suspend fun CompletableFuture.await(duration: Long): Boolean