Six months ago, I was the guy manually stitching together RestTemplate calls to OpenAI's API, writing my own retry logic, parsing raw JSON responses, and wondering why nobody had made this less painful.

Then Spring AI 2.0 dropped and I felt genuinely stupid for not waiting.

This is the exact chatbot I built — from a blank Spring Boot project to a deployed, production-ready AI assistant. No fluff, no "exercise left to the reader." Real code, real mistakes, real gotchas.

What is Spring AI and Why Does It Matter in 2026?

Spring AI is Spring's official abstraction layer for working with AI models. Think of it the way Spring Data abstracted away JDBC boilerplate — Spring AI does the same for LLM integrations.