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Add resilience: Spring Framework 7 @Retryable and @ConcurrencyLimit

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Companion code for "Spring Framework 7's Built-in Resilience: @Retryable,
@ConcurrencyLimit, and What's Left for Resilience4j". Every retry counted
by recording real invocations: defaults, backoff and jitter, timeout,
reactive and CompletableFuture returns, the concurrency limit's BLOCK and
REJECT policies, retries around transactions, composition with
Resilience4j 2.4.0, and the annotation API across 7.0.0-7.0.9.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01C3TETMrqVUWeFkNtz3Jbo3
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asmhatre
2026-09-11 17:12:25 +00:00
co-authored by Claude Opus 5
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resilience/docs/02-enabling.md
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# 2. Switching it on - and the three ways it stays off
[← 1. What ships](01-whats-in-framework-7.md) · [Index](../README.md) · Next: [3. @Retryable measured →](03-retryable-measured.md)
## Spring Boot 4.1.1 does not enable it
No auto-configuration in Boot 4.1.1 registers `RetryAnnotationBeanPostProcessor` or
`ConcurrencyLimitBeanPostProcessor` (no Boot 4.1.1 jar in this project's dependency tree mentions
either class). You need [`@EnableResilientMethods`](../src/main/java/com/ankurm/resilience/ResilienceConfig.java).
Without it the annotations are metadata. [`retry-disabled.txt`](output/retry-disabled.txt), same
method, `demo.resilience.enabled=false`:
```
"invocations": 1,
"caller": "threw: com.ankurm.resilience.support.TransientException: attempt 1 failed"
```
No warning at startup, no log line at call time.
## Self-invocation
A call from inside the bean does not go through the proxy
([`retry-self-invocation.txt`](output/retry-self-invocation.txt)): one invocation, first exception
straight to the caller. Same rule as `@Transactional` and `@Async` - see the
[AOP article](https://ankurm.com/spring-aop-pointcuts-advice-types-aspect-not-firing/).
## `final` methods
The proxies here are CGLIB subclasses (`/demo/proxy/*` reports the type - the demo beans implement
no interface). A subclass cannot override a `final` method, so a `final @Retryable` method is
called directly on the target and never retried - the same silent failure measured for `@Async` in
the [@Async article](https://ankurm.com/spring-boot-4-async-executors-virtual-threads/).