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  

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⏰ 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