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Add aot-cache module: the JDK 25 AOT cache on Spring Boot 4.1 vs AppCDS, Spring AOT and GraalVM native

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A Spring Boot 4.1.1 order service started 12 ways (plain and extracted jar, Spring AOT output, AppCDS, AOT cache trained with and without traffic, JDK 27, native image), ten interleaved rounds each, with first-request latency; 24 cache-mismatch cases; Docker layer arithmetic. Transcripts are in output/ (no docs/ folder).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 16:44:16 +00:00
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| [`core-events/`](core-events) | [Spring Application Events: @EventListener, @TransactionalEventListener and Async Events](https://ankurm.com/spring-application-events-eventlistener-transactionaleventlistener-async/) | publishing and consuming events, listener ordering, conditional listeners, `AFTER_COMMIT` behaviour proven with a rollback, and async listeners |
| [`multi-datasource/`](multi-datasource) | [Multiple DataSources in Spring Boot 4 with Spring Data JPA](https://ankurm.com/multiple-datasources-spring-boot-4-spring-data-jpa/) | two H2 databases each with its own `DataSource`, Flyway, `EntityManagerFactory` and transaction manager, six ways of getting the wiring wrong, plain vs named `@Transactional`, and `ChainedTransactionManager` under a failing commit |
| [`i18n/`](i18n) | [Internationalization (i18n) in Spring Boot 4: MessageSource, LocaleResolver and Localized ProblemDetail](https://ankurm.com/spring-boot-4-internationalization-messagesource-localeresolver-problemdetail/) | English, Marathi and Hindi message bundles, `Accept-Language` vs a cookie resolver, apostrophes and Devanagari digits in `MessageFormat`, the JVM default locale as a hidden fallback, localized validation messages and `ProblemDetail` titles |
| [`aot-cache/`](aot-cache) | [Faster Spring Boot Startup with the JDK AOT Cache (JEP 514/515): Benchmarks vs CDS and Native](https://ankurm.com/spring-boot-jdk-aot-cache-jep-514-515-startup-benchmarks/) | the JDK 25 AOT cache trained two ways, against a plain JVM, AppCDS, Spring's own AOT output and a GraalVM native image (ten interleaved rounds each), first-request latency, 24 cases where the cache silently stops applying (jar, timestamp, JVM build, ZGC, compact headers), `-XX:AOTMode=on`, Docker layer arithmetic |
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource` and `i18n` are the exception: they have **no `docs/` folder**. Their deeper material lives in
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource`, `i18n` and `aot-cache` are the exception: they have **no `docs/` folder**. Their deeper material lives in
collapsible sections inside the articles themselves, and their captured output sits in a top-level `output/`
directory instead of `docs/output/`.