Spring / Spring Retry Interview Questions
What is a BackOffPolicy in Spring Retry and what implementations are available?
A BackOffPolicy defines how long Spring Retry waits between consecutive retry attempts. It is applied by the RetryTemplate after each failed attempt and before the next. The goal is to give the failing resource time to recover and to avoid hammering it with rapid successive requests.
Available BackOffPolicy implementations:
| Implementation | Behavior |
|---|---|
| NoBackOffPolicy | No delay between retries (immediate) |
| FixedBackOffPolicy | A constant delay between every retry attempt |
| UniformRandomBackOffPolicy | Random delay within a min/max range |
| ExponentialBackOffPolicy | Delay doubles (or multiplies) after each attempt |
| ExponentialRandomBackOffPolicy | Exponential delay with added random jitter |
Programmatic example using ExponentialBackOffPolicy:
ExponentialBackOffPolicy backOff = new ExponentialBackOffPolicy();
backOff.setInitialInterval(500);
backOff.setMultiplier(2.0);
backOff.setMaxInterval(10000);
RetryTemplate template = new RetryTemplate();
template.setBackOffPolicy(backOff);The @Backoff annotation is essentially declarative sugar on top of these implementations. When you set multiplier in @Backoff, Spring Retry creates an ExponentialBackOffPolicy under the hood.
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