👀 Views: 41 💬 Answers: 1 📅 Created: 2025-06-09

java spring-boot completablefuture Java

I'm working with an scenario with a CompletableFuture timeout in my Spring Boot application using Java 17. I have a method that performs an asynchronous task using `CompletableFuture`, and I want to set a timeout for it. However, the timeout isn't being respected, and the future continues to run beyond the specified duration. Here's a simplified version of my code: ```java import java.util.concurrent.CompletableFuture; import java.util.concurrent.TimeUnit; public class MyService { public CompletableFuture<String> fetchDataAsync() { return CompletableFuture.supplyAsync(() -> { try { // Simulating a long-running task TimeUnit.SECONDS.sleep(10); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } return "Data fetched"; }); } public String getDataWithTimeout() { CompletableFuture<String> future = fetchDataAsync(); try { return future.orTimeout(5, TimeUnit.SECONDS).join(); } catch (Exception e) { // This block gets executed only for CompletionException System.out.println("behavior: " + e.getMessage()); } return null; } } ``` When I call `getDataWithTimeout()`, it seems like the CompletableFuture ignores the `orTimeout` and runs for the full duration of 10 seconds instead. I expected it to throw a `TimeoutException` after 5 seconds. I've also tried using `completeOnTimeout` and `completeExceptionally`, but those don't seem to address the scenario either. I've confirmed that my Spring Boot application is running on Java 17 and that there are no conflicting dependencies that could interfere with the CompletableFuture behavior. Can someone point out what I'm missing? Is there a specific configuration or behavior in Java 17's CompletableFuture that I need to be aware of regarding timeouts? Any help would be greatly appreciated.