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Add core-beans: bean scopes, the prototype-in-singleton trap, lifecycle callback order and graceful shutdown phases on Boot 4.1

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01JoVmf2fWvcpoXndcDSwRf7
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Claude
2026-09-24 04:59:41 +00:00
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| [`etag-caching/`](etag-caching) | [Mastering Cache Control with ETag in Spring Boot RESTful APIs](https://ankurm.com/etag-cache-control-rest-api-spring-boot/) | `spring-boot-starter-web`'s own POM now reading "deprecated in favor of spring-boot-starter-webmvc", `ShallowEtagHeaderFilter` and `WebRequest.checkNotModified()` re-verified unchanged on Spring Framework 7, deep cache vs shallow cache, and conditional `PUT` with `If-Match` as optimistic locking |
| [`restclient-basic-auth/`](restclient-basic-auth) | [Spring Boot RestTemplate with Basic Auth: A Modern Guide](https://ankurm.com/spring-boot-resttemplate-with-basic-auth-a-modern-guide/) | RestClient with Basic Auth two ways against a real embedded server, `{noop}` passwords confirmed to emit no runtime warning at all, `spring-boot-starter-restclient` as its own required Boot 4 module, and the `RestClient.exchange()` trap covered in depth by the [RestTemplate to RestClient migration guide](https://ankurm.com/resttemplate-to-restclient-migration-guide/) |
| [`core-di/`](core-di) | [Dependency Injection in Spring Boot 4: Constructor vs Setter vs Field (and Why Field Injection Hurts)](https://ankurm.com/spring-boot-4-dependency-injection-constructor-setter-field/) and [@Autowired Explained: By-Type Resolution, @Qualifier, @Primary, ObjectProvider and List Injection](https://ankurm.com/spring-autowired-qualifier-primary-objectprovider-list-injection/) | one `OrderService` in three injection styles built with plain `new`, a field-injected dependency used in a constructor, circular dependencies in plain Spring vs Boot with the real failure report, `@Lazy` injecting a proxy, and the `@Autowired` resolution ladder read from Spring 7.0.9 bytecode (name match beats `@Priority`), plus the empty-collection trap that only bites field and setter injection |
| [`core-beans/`](core-beans) | [Spring Bean Scopes: Singleton, Prototype, Request, Session and the Prototype-in-Singleton Trap](https://ankurm.com/spring-bean-scopes-singleton-prototype-request-session-prototype-in-singleton-trap/) and [Spring Bean Lifecycle in Boot 4: @PostConstruct, InitializingBean, SmartLifecycle and Shutdown Order](https://ankurm.com/spring-bean-lifecycle-postconstruct-smartlifecycle-shutdown-order/) | instance counts per scope, five fixes for a prototype inside a singleton, request scope without a proxy failing at start-up, every lifecycle callback in order, `@PostConstruct` running before the proxy exists, `SmartLifecycle` phases measured, and a `SmartLifecycle` at the default phase stopping before Tomcat has drained |
`core-di` and `core-beans` 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/`