Question 1

How to implement a retry policy with exponential backoff in Failsafe?

Accepted Answer

Failsafe allows configuring retry policies with exponential backoff using the RetryPolicy builder. You can set delays, max attempts, and jitter to handle transient failures effectively. Check the official documentation for code examples and best practices.

Question 2

Failsafe vs Resilience4j: which is better for Spring Boot applications?

Accepted Answer

Failsafe is lightweight and zero-dependency, making it a good choice for minimal setups, while Resilience4j integrates seamlessly with Spring Cloud and provides built-in metrics via Micrometer. Choose Failsafe if you prefer a lean library, or Resilience4j for Spring ecosystem integration.

Question 3

Can Failsafe handle asynchronous calls in Java?

Accepted Answer

Yes, Failsafe supports asynchronous executions through its AsyncFailsafe class or by using CompletableFuture. It allows wrapping async logic with resilience policies, ensuring that failures in async operations are handled gracefully.

Question 4

How to set up a circuit breaker that opens after multiple failures?

Accepted Answer

Configure a CircuitBreaker in Failsafe by setting failure thresholds and delay policies. For example, you can specify that the breaker opens after 5 failures and stays open for 30 seconds before allowing half-open state. Refer to the circuit breaker docs for detailed configuration options.

Question 5

Does Failsafe work with JAX-RS or other HTTP clients besides OkHttp?

Accepted Answer

Failsafe provides modules for OkHttp and Retrofit, but for other HTTP clients like JAX-RS or Apache HttpClient, you'll need to manually integrate by wrapping the calls with Failsafe policies. The library's flexible API makes this possible with some custom code.

Question 6

How to monitor the state of a Failsafe circuit breaker in production?

Accepted Answer

Failsafe does not include monitoring tools, so you need to implement custom logging or integrate with metrics libraries like Micrometer. You can listen to circuit breaker events and export them to monitoring systems for real-time visibility.

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