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Spring / Spring Retry Interview Questions

How does Spring Retry differ from Resilience4j Retry?

Both Spring Retry and Resilience4j Retry solve the same problem — retrying failed operations — but they differ significantly in design philosophy, feature set, and integration style.

Spring Retry vs Resilience4j Retry
FeatureSpring RetryResilience4j Retry
Design focusSpring-native, AOP-firstFunctional, library-first, framework-agnostic
Circuit BreakerBasic CircuitBreakerRetryPolicyFull-featured, event-driven circuit breaker
MetricsManual via RetryListenerBuilt-in Micrometer integration
Reactive supportNone (blocking only)First-class Reactor/RxJava support
Rate LimiterNot includedBuilt-in
BulkheadNot includedBuilt-in
ConfigurationAnnotations + Java configJava config + application.properties (Spring Boot starter)
Best forSpring Batch, simpler servicesReactive apps, microservices needing full resilience suite

The choice depends on your stack: if you are building reactive microservices and need circuit breaking, rate limiting, and bulkheads, Resilience4j is the stronger fit. For traditional Spring MVC apps or Spring Batch processing, Spring Retry is simpler and better integrated.

Which resilience feature does Resilience4j provide that Spring Retry does not include?
For which scenario is Spring Retry typically a better fit than Resilience4j?

More Related questions...

What is Spring Retry and why is it used? How do you add Spring Retry to a Spring Boot project? What is the @Retryable annotation and what are its key attributes? What is the @Recover annotation and when is it invoked? What is the @Backoff annotation and how does it control retry delays? What is RetryTemplate and how does it differ from annotation-based retry? What are the different retry policies available in Spring Retry? What is a BackOffPolicy in Spring Retry and what implementations are available? What is a RetryContext and what information does it carry? How does the RetryListener interface work in Spring Retry? How does Spring Retry implement the circuit breaker pattern? What is stateful retry in Spring Retry and when should it be used? How do you configure Spring Retry using application properties in Spring Boot? What is the difference between include and exclude in @Retryable? How does Spring Retry integrate with Spring Batch? What common pitfalls should you avoid when using @Retryable? How do you write a unit test for a @Retryable method? How does Spring Retry handle exceptions that are not in the retryFor list? What is the RetryOperationsInterceptor and how is it used? How can you use Spring Retry with Spring WebClient or RestTemplate? How does the ExceptionClassifierRetryPolicy work? What is the RetryCallback interface in Spring Retry? How does Spring Retry differ from Resilience4j Retry? What is the RetryContextCache and when do you need a custom implementation? Can Spring Retry be used with Spring Cloud OpenFeign? How? How do you implement a custom RetryPolicy in Spring Retry? How do you use Spring Retry with Spring Kafka consumers? What is the proxyTargetClass attribute in @EnableRetry? How does the CompositeRetryPolicy work in Spring Retry? What is the difference between retry and idempotency? Why does it matter? How do you configure Spring Retry to use a fixed backoff programmatically? What is the maxAttemptsExpression attribute and how does it differ from maxAttempts? How does Spring Retry integrate with Spring's @Transactional? What is the use of the recover attribute in @Retryable? What are transient vs permanent failures and why does the distinction matter for retry? How do you implement retry with a custom exception condition using RetryPolicy? How does Spring Retry handle the case when @Recover returns void? What is exponential backoff with jitter and why is it preferred over plain exponential backoff? How can you monitor and observe Spring Retry behavior in production? What is the difference between RetryTemplate.execute() and RetryTemplate.executeWithLoadBalancer()?
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