asmhatreandClaude Opus 5
7e1676c763
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
34 lines
1.5 KiB
Markdown
34 lines
1.5 KiB
Markdown
# 2. Switching it on - and the three ways it stays off
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[← 1. What ships](01-whats-in-framework-7.md) · [Index](../README.md) · Next: [3. @Retryable measured →](03-retryable-measured.md)
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## Spring Boot 4.1.1 does not enable it
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No auto-configuration in Boot 4.1.1 registers `RetryAnnotationBeanPostProcessor` or
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`ConcurrencyLimitBeanPostProcessor` (no Boot 4.1.1 jar in this project's dependency tree mentions
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either class). You need [`@EnableResilientMethods`](../src/main/java/com/ankurm/resilience/ResilienceConfig.java).
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Without it the annotations are metadata. [`retry-disabled.txt`](output/retry-disabled.txt), same
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method, `demo.resilience.enabled=false`:
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```
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"invocations": 1,
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"caller": "threw: com.ankurm.resilience.support.TransientException: attempt 1 failed"
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```
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No warning at startup, no log line at call time.
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## Self-invocation
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A call from inside the bean does not go through the proxy
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([`retry-self-invocation.txt`](output/retry-self-invocation.txt)): one invocation, first exception
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straight to the caller. Same rule as `@Transactional` and `@Async` - see the
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[AOP article](https://ankurm.com/spring-aop-pointcuts-advice-types-aspect-not-firing/).
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## `final` methods
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The proxies here are CGLIB subclasses (`/demo/proxy/*` reports the type - the demo beans implement
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no interface). A subclass cannot override a `final` method, so a `final @Retryable` method is
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called directly on the target and never retried - the same silent failure measured for `@Async` in
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the [@Async article](https://ankurm.com/spring-boot-4-async-executors-virtual-threads/).
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