Getting Started with LangChain4j | Build Your First AI Chat API

In this video, we cover the core basics of the LangChain4j framework and show you how it simplifies the integration of Large Language Models (LLMs) into the Spring Boot ecosystem. We will build a very simple chat-based application where we send a message to an AI model and get a response back. We’ll be using the framework's low-level API and OpenRouter to connect to models like DeepSeek all while keeping the code clean and beginner friendly. What we cover in this video: ✅ What is LangChain4j and why is it a game-changer for Java? ✅ Understanding low-level vs high-level APIs ✅ Setting up Spring Boot with LangChain4j ✅ Integrating with OpenRouter's free AI models ✅ Building a simple REST endpoint using ChatModel ✅ Testing your first AI application 📖 Complete Tutorial & Source Code: Get the full step-by-step guide and complete source code on our blog: https://bootcamptoprod.com/langchain4... Connect with me: LinkedIn:   / bunty-raghani   ━━━━━━━━━━━━━━━━━━━━━━━━━ 🛒 MY SETUP - The gear that powers these tutorials: ━━━━━━━━━━━━━━━━━━━━━━━━━ 🖥️ Mac Mini: https://amzn.to/4ltPhup ⌨️ Logitech K235 Keyboard: https://amzn.to/4mNI0Xh 🖱️ Logitech MX Master 3S Mouse: https://amzn.to/45lZFja 🎤 Boya BY-PM700 Mic: https://amzn.to/4oHUIc1 🌐 Hostinger Web Hosting: https://hostinger.in?REFERRALCODE=A0W... 📝 Disclaimer: This description contains affiliate links (like Amazon & Hostinger). If you click one and make a purchase, I may receive a small commission at no extra cost to you. As an Amazon Associate, I earn from qualifying purchases. Thanks for supporting the channel! ⏰ Timestamps: 00:00 - Introduction 00:13 - What is LangChain4j 01:54 - LangChain vs LangChain4j 02:45 - Low Level & High Level APIs 03:47 - App Overview 05:05 - Code Walkthrough 10:49 - Testing 11:58 - LLM Request & Response Logs 13:14 - Outro