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Add caching: the Spring cache abstraction, keys, eviction timing and the self-invocation trap

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A Spring Boot 4.1.1 module whose test suite is the evidence for the article: 20 tests
producing 22 transcripts under docs/output/, plus 12 documentation chapters.

Findings the build pins:
- @EnableCaching has no exposeProxy attribute; the widely-copied
  @EnableCaching(exposeProxy = true) does not compile.
- Two methods sharing a cache name and an argument type share a key space, and one
  silently serves the other's answers.
- The documented cache-provider detection order does not match CacheType's enum
  order in 4.1.1: COUCHBASE before INFINISPAN, and CACHE2K before CAFFEINE.
- beforeInvocation = true is NOT deferred by TransactionAwareCacheManagerProxy on
  7.0.9 - doEvict picks evictIfPresent, which the decorator does not intercept.
- Four of five invalid declarations start a clean context and throw at the first call.
- Caffeine on the classpath silently displaces the simple provider.
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2026-09-12 05:35:13 +00:00
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| [`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 |
| [`caching/`](caching) | [The Spring Cache Abstraction: @Cacheable, @CacheEvict, Key Generators and the Self-Invocation Trap](https://ankurm.com/spring-cache-abstraction-cacheable-cacheevict-self-invocation-trap/) | the self-invocation trap measured four ways, the key collision `SimpleKeyGenerator` makes easy, eviction timing under a thrown exception, a rollback the cache keeps, and where this sits next to Hibernate's L2 cache |
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