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Add the hexagonal module: Hexagonal Architecture (Ports and Adapters) in Spring Boot 4

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Claude
2026-10-03 20:28:16 +00:00
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| Directory | Article | What it demonstrates |
|---|---|---|
| [`hexagonal/`](hexagonal) | [Hexagonal Architecture (Ports and Adapters) in Spring Boot 4](https://ankurm.com/hexagonal-architecture-ports-and-adapters-spring-boot-4/) | a 4-module Maven reactor that makes "the core has no Spring dependency" something `mvn dependency:tree` proves rather than a naming convention, testing the core with zero Spring context, and a Spring Boot 4 test-slice-artifact split (`@DataJpaTest`, `@WebMvcTest`, `TestRestTemplate`) hit and fixed along the way |
| [`actuator-in-production/`](actuator-in-production) | [Spring Boot Actuator in Production](https://ankurm.com/spring-boot-actuator-production-endpoints-security-health-indicators/) | endpoint exposure defaults, securing Actuator, custom health indicators and how they hang |
| [`spring-boot-startup-time/`](spring-boot-startup-time) | [Why Your Spring Boot App Takes 8 Seconds to Start](spring-boot-startup-time/post/post.md) | `BufferingApplicationStartup`, JFR startup events, self time vs total time, the classpath-scan tax, the JDK 25 AOT cache |
| [`configuration-properties/`](configuration-properties) | [@ConfigurationProperties vs @Value in Spring Boot 4](https://ankurm.com/) | relaxed binding measured three ways, record constructor binding, validation, IDE metadata generation |
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| [`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`, `i18n` and `aot-cache` are the exception: they have **no `docs/` folder**. Their deeper material lives in
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource`, `i18n`, `aot-cache` and `hexagonal` 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/`.
directory instead of `docs/output/` (`hexagonal` is also the one multi-module reactor in this
repo, so its output sits one level deeper still, under each module: `core/output/`,
`persistence-adapter/output/`, and so on).
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