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| [`boot42-rc1-checklist/`](boot42-rc1-checklist) | [Spring Framework 7.1 and Spring Boot 4.2: What's Coming and How to Prepare](https://ankurm.com/spring-boot-4-2-spring-framework-7-1-upgrade-checklist/) | each 4.2 milestone change run on 4.2.0-RC1 and on 4.1.2: `@DefaultValue` placeholders resolved, five new Kafka admin keys that 4.1.2 silently ignores, embedded LDAP SSL failing without a bundle, the properties migrator's real report (and the removed key it misses), and the `RestTemplate` removal warnings from the compiler |
| [`boot42-otel/`](boot42-otel) | [Spring Boot 4.2 OpenTelemetry: Semantic Conventions, Shared OTLP Settings and MDC Keys](https://ankurm.com/spring-boot-4-2-opentelemetry-semantic-conventions-shared-otlp-mdc/) | one request measured under each `management.observations.conventions` value (the documented `open-telemetry` fails to start on RC1, `opentelemetry` works), meter, span and Prometheus names before and after, `management.opentelemetry.otlp.*` verified against a local OTLP receiver (paths, merged headers, gzip, per-signal overrides), custom MDC keys, and the LongTaskTimer that is no longer on by default |
| [`boot4-migration/`](boot4-migration) | [Spring Boot 3 to 4 Migration Guide (Updated for 4.1 and 4.2)](https://ankurm.com/spring-boot-3-to-4-migration-guide/) | one Boot 3.5.16 service migrated to 4.1.2 with the real failures captured at each step: 12 javac errors from a version bump, a start-up failure from a missing `spring-boot-starter-restclient`, Flyway silently not running without `spring-boot-starter-flyway`, removed `logging.file.*` keys silently ignored, Jackson 3 sorting bean properties, liveness/readiness groups appearing, and a `@Mock` field that is `null` without `MockitoExtension` |
| [`startup-runners/`](startup-runners) | [CommandLineRunner vs ApplicationRunner vs ApplicationReadyEvent in Spring Boot 4](https://ankurm.com/commandlinerunner-vs-applicationrunner-vs-applicationreadyevent-spring-boot-4/) | the real order of every startup hook printed from a running app, one shared sort for both runner types with arbitrary ties, runner failure vs `ApplicationReadyEvent` listener failure (exit codes, `ApplicationFailedEvent`), a blocking runner holding readiness at 503, `SmartLifecycle` phases, and which hooks `@SpringBootTest` and `@WebMvcTest` run |
| [`mapstruct/`](mapstruct) | [MapStruct with Spring Boot 4 and Java Records: DTO Mapping Done Right](https://ankurm.com/mapstruct-spring-boot-4-java-records-dto-mapping/) | records as source and target, nested and collection mapping, null strategies, `@AfterMapping` and `@DecoratedWith`, real compile-time error text for broken mappers, three ways to test a mapper, and an indicative comparison with hand-written code and Dozer |
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource`, `i18n`, `aot-cache`, `kotlin`, `testing-no-containers`, `rest-test-client` and `hexagonal` are the exception: they have **no `docs/NN-topic.md` chapter folder**. Their deeper material lives in
collapsible sections inside the articles themselves. Where their captured output sits is not