Why it matters

Retries shape reliability. Understanding shapes design.

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The architecture

Classify errors.

Exponential backoff + jitter.

Retry cap.

Retry logic flowClassify errorretriable or notBackoffexp + jitterRetry or failcap attemptsResilience4j Retry integrates cleanly with CircuitBreaker + RateLimiter
Retry.
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How it works end to end

Retriable: 5xx, timeouts, rate limits.

Terminal: 4xx (except 429).

Exponential base 2 + jitter.

Idempotency keys.