Article series

From Scratch to Merge-Ready.

The essays are distribution, but they are not detached thought pieces. Each article points back to a lesson, command, test, or committed artifact.

9 minutes / published

Java 25 for Kotlin Developers

The actual delta: syntax, runtime model, and the places Java is explicit on purpose.

8 minutes / published

A practical bridge from dependency graphs you know to the Spring container you have to debug.

11 minutes / published

Why Phase 2A writes SQL before entities, and why the no-overlap rule belongs in the database.

13 minutes / published

Entity states, lazy boundaries, dirty checking, and transaction proxies made visible through tests.

12 minutes / published

A deliberately broken query, three fixes, the pagination trap, and a geo query with stable ordering.

10 minutes / published

Why the course opens an Oracle lane and keeps no-overlap true with different database mechanisms.

11 minutes / published

Controller boundaries, RFC 9457 error payloads, pagination metadata, springdoc, and ADR-002.

12 minutes / published

Resource server configuration, method security, CORS vs CSRF, and request tests that prove the chain.

12 minutes / published

Actuator, Prometheus, structured logs, correlation IDs, and cache metrics only matter when they answer an incident question.

13 minutes / published

Postgres exclusion constraints, Oracle row locks, Testcontainers gates, and a read-only ARM demo deployment.