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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Reviews and comparisons of the best AI tools available in 2026.
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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 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 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 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 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 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.
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