Java 17: Why is my CompletableFuture not completing as expected?
I'm relatively new to this, so bear with me... I keep running into I'm trying to configure I'm using Java 17 and I've encountered a question with `CompletableFuture`. I have a method that performs a network request and I want to execute it asynchronously. However, the `CompletableFuture` is not completing, and I keep getting a timeout exception instead of the expected result. Here’s the code I’m using: ```java import java.net.HttpURLConnection; import java.net.URL; import java.util.concurrent.CompletableFuture; public class NetworkRequest { public CompletableFuture<String> fetchData(String url) { return CompletableFuture.supplyAsync(() -> { try { HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection(); connection.setRequestMethod("GET"); return connection.getResponseCode() == 200 ? "Success" : "Failure"; } catch (Exception e) { throw new RuntimeException(e); } }); } } ``` And I'm calling it like this: ```java public class Main { public static void main(String[] args) { NetworkRequest networkRequest = new NetworkRequest(); CompletableFuture<String> future = networkRequest.fetchData("https://example.com/data"); future.thenAccept(System.out::println); try { future.get(5, TimeUnit.SECONDS); // Timeout after 5 seconds } catch (Exception e) { System.out.println("behavior: " + e.getMessage()); } } } ``` When I run the program, I often see the following behavior message after 5 seconds: ``` behavior: Timeout waiting for CompletableFuture ``` I’ve confirmed that the URL is reachable and I even tried increasing the timeout duration, but the scenario continues. Is there something I'm missing in my configuration, or is there a best practice I should be following when using `CompletableFuture` in this context? I also tried running the `fetchData` method synchronously, and it works fine, which makes me think there might be an scenario with the asynchronous execution. Any help would be appreciated! I'm working in a CentOS environment. Any ideas what could be causing this? Is there a better approach? The stack includes Java and several other technologies. Could this be a known issue?