How does error handling work with async/await in Java?

How does error handling work with async/await in Java?

In Java, error handling with async/await can be managed using try-catch blocks. When you use async methods, you can await their results and handle exceptions that may occur during their execution.

Can you give me an example of using try-catch with async/await?

Sure! Here's a simple example:

public CompletableFuture<String> fetchData() {
    return CompletableFuture.supplyAsync(() -> {
        // Simulate a delay
        try { Thread.sleep(1000); } catch (InterruptedException e) { }
        // Simulate an error
        if (true) throw new RuntimeException("Data fetch error");
        return "Data";
    });
}

public void handleData() {
    try {
        String result = fetchData().join();
        System.out.println(result);
    } catch (CompletionException e) {
        System.out.println("Error: " + e.getCause().getMessage());
    }
}

What happens if I don't handle exceptions in async methods?

If you don't handle exceptions in async methods, they can lead to unhandled exceptions that may crash your application or result in unexpected behavior. It's crucial to manage errors properly.

Are there any best practices for error handling with async/await?

Yes, some best practices include:

1. Always use try-catch blocks around await calls.
2. Log errors for debugging purposes.
3. Consider using custom exception classes for better error categorization.