LangChain4j ChatModel Interface Explained

In this detailed tutorial, we will master the ChatModel interface in LangChain4j. We will explore all ChatModel methods with working code examples.

📚 What You'll Learn:
✅ Understanding the ChatModel interface and its methods
✅ All ChatModel methods explained with examples:
• chat(String) - Simple Q&A
• chat(ChatMessage...) - Multiple messages with metadata
• chat(List ChatMessage) - Conversational AI with history
• chat(ChatRequest) - Advanced control with custom parameters
• doChat(ChatRequest) - Low-level direct calls
✅ ChatMessage types: SystemMessage, UserMessage, and AiMessage
✅ ChatRequest parameters: temperature, tokens,, stop sequences
✅ ChatResponse metadata: token usage, finish reasons
✅ Model capabilities, providers, and listeners

📖 Complete Tutorial & Source Code:
Get the full step-by-step guide and complete source code on our blog:
https://bootcamptoprod.com/langchain4...

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⏰ Timestamps:
00:00 - Introduction
00:22 - What is ChatModel?
00:48 - Understanding the Request Flow
01:33 - Core Building Blocks
04:50 - Creating Request and Response Objects
12:30 - Project Structure
13:18 - Code Walkthrough
32:34 - Testing Simple Chat Endpoint
33:38 - Testing With Chat Messages Endpoint
34:21 - Testing Chat Conversation Endpoint
35:18 - Testing Advanced Endpoint
36:05 - Testing Direct Endpoint
36:27 - Testing Model Metadata Endpoint
37:58 - Outro