Categories
Every guide here was written after actually running the tool. Pick the topic that matches the problem you are hitting — no prior experience assumed.
AI Coding Agents
Hands-on guides for Claude Code, OpenAI Codex, Cursor and GitHub Copilot — setup, sandboxing, MCP servers, subagents and hooks.
18 articles →
Spring Boot 4 Migration
Upgrading to Spring Boot 4 and Spring Framework 7: Jakarta EE 11, Security 7, Jackson 3, and the silent behaviour changes tests catch first.
11 articles →
Testing & CI
JUnit 6, Maven and Gradle builds, ArchUnit, Spotless, Testcontainers and CI gates — and why AI-generated code can pass CI while running zero tests.
7 articles →
AI on Real Code
Pointing AI at an actual codebase: code review, legacy refactoring, LangChain agents, and the MCP filesystem server.
7 articles →
AI API & Errors
Fixing OpenAI and ChatGPT API errors: 429 rate limits, the 429001 gateway code, quota tiers, and retry strategy that holds up.
3 articles →
AI Models & Basics
Model comparisons, prompt technique, and hallucination control — the fundamentals, in plain language and without the hype.
7 articles →