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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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| [`docker-images/`](docker-images) | [Dockerizing Spring Boot 4: Layered Jars, Buildpacks, Distroless and Image Size Benchmarks](https://ankurm.com/dockerizing-spring-boot-4-layered-jars-buildpacks-distroless/) | one service packaged nine ways and measured: size on disk and pushed, rebuild delta, startup, PID 1 and signals, jlink, the JDK 25 AOT cache |
| [`kubernetes-deployment/`](kubernetes-deployment) | [Deploying Spring Boot 4 on Kubernetes](https://ankurm.com/spring-boot-4-kubernetes-probes-graceful-shutdown-cpu-limits-hpa/) | probe groups under a dependency outage, graceful shutdown under load four ways, JVM ergonomics per pod shape, CPU limits throttling GC, HPA on a Micrometer metric |
| [`problem-details/`](problem-details) | [Global Exception Handling with ProblemDetail (RFC 9457) in Spring Boot 4](https://ankurm.com/spring-boot-4-problemdetail-rfc-9457-global-exception-handling/) | thirteen failures under five handling setups, validation errors, i18n, content negotiation, errors outside MVC, silent 500s, decoding on the client |
| [`resilience/`](resilience) | [Spring Framework 7's Built-in Resilience: @Retryable, @ConcurrencyLimit, and What's Left for Resilience4j](https://ankurm.com/spring-framework-7-retryable-concurrencylimit-resilience4j/) | `@Retryable` and `@ConcurrencyLimit` counted invocation by invocation, retries inside transactions, where Resilience4j still earns its place, migrating from Spring Retry |
Articles whose text is kept here rather than only on the blog have it under
`<directory>/post/` — `post.md` for the body and `meta.md` for the title, excerpt and