Codex Upgraded My Spring Boot 4 YAML. 3 Tools, 3 Blind Spots (2026)
Codex migrated 8 keys in my application.yml to Spring Boot 4.1.1. The 3 it missed still worked. Here are the three tools I used to find what actually broke.
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In-depth guides and honest reviews covering the best AI tools available today. New articles published weekly.
Claude Code on Gradle: BUILD SUCCESSFUL With Zero Tests (2026)
Gradle printed BUILD SUCCESSFUL in 401ms and ran zero tests. On Spring Boot 4.1.1, I pointed Claude Code at it five times. It caught it all five.
Read moreCodex in CI: All 7 Tests Passed. It Changed the Rule (2026)
I asked Codex to fix a red CI build where the test and the spec disagreed. It made all 7 tests pass by editing the business rule. Three times out of three.
Read moreCodex Added 12 Spring Boot 4 Dependencies. 5 Failed Silently (2026)
I asked Codex to add 12 dependencies to a Spring Boot 4.1.1 project. One was right. Five built green and wired nothing. Here is the test that tells them apart.
Read moreCodex Can't Run Testcontainers on Spring Boot: Docker Socket Fix 2026
I ran Testcontainers under every Codex sandbox policy. One config line decides it — and when it failed, Codex disabled my test to get a green build.
Read moreFlyway Checksum Mismatch: Why CI Never Sees It (2026)
I rewrote an applied Flyway migration. The database that had already run it refused to boot. A fresh CI database migrated clean, into a different schema.
Read moreCodex Fixed My Boot 4 403 — AGENTS.md Changed the Fix (2026)
I ran OpenAI Codex on the same broken Boot 4 upgrade twice. Without an AGENTS.md it killed CSRF app-wide; with one, the exemption stayed scoped to /api/**.
Read moreAI Wrote 18 Tests. Only 14 Ran: Spring Boot 4 + JUnit 6 (2026)
Claude Code added tests to my Spring Boot 4 app and reported 14 passing. Three more never ran. Here is how Surefire hides them, and the AGENTS.md fix.
Read moreCodex Can't Run Maven on Spring Boot: Unknown Host Sandbox Fix (2026)
I ran one Spring Boot build under every Codex sandbox policy. Default failed, full-auto failed on a cold repo, only one setting let Maven download.
Read moreClaude Code vs ArchUnit: My CI Gate Broke While Obeying Me (2026)
Claude Code's Spring Boot code compiled and passed tests, then failed CI on ArchUnit and Spotless. One run fixed it; another reverted my fix and killed a gate.
Read moreClaude Code Fixed My Boot 4 403 — AGENTS.md Changed the Fix (2026)
I gave Claude Code the same broken Boot 4 upgrade twice — no context, then with an AGENTS.md. One disabled CSRF globally, one scoped it. Here is the diff.
Read moreSpring Boot 4 Migration: What AI Agents Can and Can't Fix (2026)
Boot 3.5 hit EOL in June 2026. I read Spring's Boot 4 migration guide: which breaking changes AI really automates, and which ones it quietly gets wrong.
Read moreAn AGENTS.md for Spring Boot That Codex Actually Understands (2026)
A real AGENTS.md for a Spring Boot project: the layers, bean rules, and build commands I put in so Codex stops guessing. What worked and the traps I hit.
Read moreFilesystem MCP Server + Claude Code for Spring Boot (2026)
How I wired the Filesystem MCP server into Claude Code for Spring Boot: scoped directories, a --read-only guardrail, and the generated-code traps I hit.
Read moreOpenAI Codex with Spring Boot: A Practical Workflow (2026)
How I use OpenAI Codex on a real Spring Boot project in 2026: AGENTS.md, approval modes, the cloud sandbox, and the habits that stop it breaking the build.
Read moreHow I Made Cursor Understand My Spring Boot Codebase (2026)
How I got Cursor to understand my Spring Boot monorepo: indexing, @codebase, a clean .cursorignore for build junk, and the traps that broke my bean wiring.
Read moreMake Claude Code Remember Your Spring Boot Project (2026)
How I made Claude Code remember my real Spring Boot codebase (CLAUDE.md + auto memory): the rules that stopped it breaking the build, and the traps I hit.
Read moreClaude Code + GitHub Actions for Spring Boot: Auto-Review PRs (2026)
How I wired Claude Code into GitHub Actions to auto-review Spring Boot PRs and fix failing CI builds — the real YAML, OAuth setup, and cost traps I hit.
Read moreGitHub Copilot with Spring Boot: Does It Actually Help in 2026?
I ran GitHub Copilot on a real Spring Boot codebase in 2026: where it speeds Java work up, where it quietly breaks the build, and if it is worth paying for.
Read moreAI for Java Developers: A Practical Guide (2026)
Senior Java engineer's honest 2026 guide to AI coding tools for Java and Spring Boot: Cursor, Claude Code, testing, code review — what actually works.
Read moreClaude Code Subagents & Hooks on Spring Boot: My Guardrails (2026)
How I use Claude Code subagents and hooks on Spring Boot: real .claude configs that stop an agent from breaking the Gradle build or skipping tests.
Read moreCursor Background Agents on a Spring Boot Repo: 4 Gotchas (2026)
Handed Spring Boot grunt work to Cursor's background agents, got PRs that broke bootRun. 4 cloud-vs-local gotchas and the .cursor rules that fixed them.
Read moreWhat AI Code Review Misses in Java (and How I Catch It) (2026)
My team runs every PR through an AI reviewer, but it once green-lit code that broke production. Here's what AI code review misses in Java, and my workflow.
Read moreI Let AI Write My JUnit Tests. Here's What Broke.
I let AI generate JUnit tests for my Java code. They passed, and proved nothing. Here's how I write tests with AI and the 5 traps I check first.
Read moreCursor with Spring Boot: A Practical Java Workflow (2026)
How I use Cursor on a real Spring Boot codebase in 2026: project rules, the prompts that work, and the bean-wiring traps that break the build.
Read moreClaude Code with Spring Boot: A Practical Workflow
How I actually use Claude Code on a Spring Boot project in 2026: setup, CLAUDE.md, running the build, and the habits that keep the AI from drifting off.
Read moreOpenAI 429001 Error: What It Means and How I Fixed It
Got a 429001 error from the OpenAI API or a Chinese model gateway? Here's what the 429001 subcode means and the exact backoff code I used to fix it.
Read moreLangChain 1.x Tool Calling & Agents: GLM + MiniMax via OpenAI Endpoint
How I wired LangChain tool calling and create_agent to GLM and MiniMax via the OpenAI-compatible endpoint — the bind_tools loop and the tool.invoke footgun.
Read moreVibe-Coded a PDF→Word Converter with Claude Code (227 Pages)
A Java dev with zero PyQt experience built a PDF→Word converter in Claude Code — the pipeline that got 0% garbled text on a 227-page bank doc.
Read moreUsing AI on a Legacy Java Codebase (What Actually Works)
A senior Java engineer's real lessons on using AI to change legacy code: undocumented patches, shared multi-channel logic, and how to fence the AI in.
Read moreMCP Tutorial: Connect Your AI to Everything (Without Getting Burned)
MCP tutorial 2026: set up MCP servers with Claude and Cursor, and avoid the security traps that burned real users.
Read moreOpenAI 429 Fix: How to Read Every Error Variation (2026)
OpenAI 429 isn't one error — it's several. Here's how to read the error body and headers, tell each 429 variation apart, and apply the right fix.
Read moreCursor Rules Tutorial: Make AI Write Code the Way You Do
An engineer's guide to Cursor rules in 2026: why .cursorrules is dead, how .cursor/rules works, and the setup that makes AI write code like you.
Read moreLoop Engineering: Your Prompts Are the Bottleneck, Not the AI
Tired of prompting AI agents one by one? Loop Engineering replaces you with a self-running system that iterates. Here's what it means for your work.
Read moreOpenClaw vs Hermes Agent: Which Open-Source AI Agent Should You Run?
Comparing OpenClaw vs Hermes Agent, 2026's two biggest open-source AI agents. I tested both to help you choose.
Read moreWhy Does AI Make Things Up? 7 Ways to Stop AI Hallucinations
AI chatbots invent APIs, fake libraries, and wrong code. Here are 7 practical ways I stop AI hallucinations as a developer who uses AI to write Java every day.
Read moreHarness Engineering: What Prompt Engineering Couldn't Solve
Harness engineering is the 2026 AI paradigm shift. What it is, why prompt engineering hit its limits, and how to build your own agent harness.
Read moreOpenAI Rate Limits: The 2 Different 429 Errors Explained
Two different 429 errors share one status code and need different fixes. Here's how OpenAI's TPM, RPM, and 5 tiers really work — and how to check yours.
Read moreCursor AI Editor: How I Switched from VS Code and Never Looked Back
How I set up Cursor AI, what works, what annoys me, and why I pay $20/month for it. Honest review from a Java developer.
Read moreChatGPT 429 Error? 5 Fixes I Tested (and One Failed)
Got ChatGPT API error 429? Here's how I fixed it after my script broke at 2AM. Exponential backoff code, Batch API tips, and what actually works.
Read moreClaude Projects: How I Organized 50+ AI Chats
Claude Projects changed how I use AI. Here's how to set it up, what actually works, and the limitations nobody tells you about. Updated for Claude 4.7 in 2026.
Read moreClaude 4.7 vs GPT-5.5: I Tested Both — Here's My Pick
A 2026 comparison of Claude 4.7 and GPT-5.5 covering pricing, writing, coding, long documents, research, and real-world use cases.
Read more10 Best AI Tools I Actually Use Daily (2026 Tested)
We tested dozens of AI productivity tools to bring you the top 10 that actually save time. Compare features, pricing, and real-world performance.
Read moreMidjourney Guide: Create AI Art That Doesn't Look AI
Learn how to use Midjourney to create professional AI-generated art. Covers setup, prompts, parameters, styles, and pro tips for stunning results.
Read morePrompt Engineering Techniques: Your Prompts Aren't the Problem—Fix It
Tired of vague AI answers? These 10 prompt engineering techniques—few-shot, chain-of-thought, role prompting—get better results from ChatGPT and Claude.
Read moreChatGPT for Beginners: Start Here in 2026
New to ChatGPT? This beginner-friendly guide covers everything from creating an account to writing your first prompt, with practical examples and tips.
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