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LangChain4j for Beginners

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LangChain4j for Beginners

Join Microsoft Reactor and engage with developers live

Ready to get started with AI and the latest technologies? Microsoft Reactor provides events, training, and community resources to help developers, entrepreneurs and startups build on AI technology and more. Join us!

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LangChain4j for Beginners

  • Format:
  • alt##LivestreamLivestream

Topic: Coding, Languages, and Frameworks

Language: English

  • Events in this Series:
  • 5

A hands-on series for Java developers who want to ship real AI features, not just hello-world demos. Over five sessions, you’ll build working examples with LangChain4j and Azure OpenAI—starting from basic chat, through prompt patterns and document retrieval, and ending with AI agents that can call external tools and services. Every session includes live coding plus a GitHub repo with all the code, so you can follow along, copy, adapt, and drop it straight into your own projects.

What you'll learn

Foundations & memory
Wire a Java application to GPT-5 using LangChain4j. Start with simple request–response calls, then add chat memory to maintain conversation context. You’ll compare stateless vs. stateful sessions side by side and see how tokens, context windows, and configuration choices impact cost, latency, and capability.

Prompt engineering
Learn how prompt structure changes everything. We’ll cover eight practical patterns for consistent output—controlling reasoning depth, adding self-reflection so the model checks its own work, enforcing structured JSON responses, and using chain-of-thought techniques to make reasoning visible and debuggable.

RAG (Retrieval-Augmented Generation)
Turn your own documents into an extension of the model. You’ll build an end-to-end retrieval pipeline: chunking, embeddings, semantic search, and answer synthesis with citations. By the end, you’ll have an AI that answers from your data instead of guessing from its training set.

Tools & MCP
Move from “text generator” to “action taker.” You’ll expose Java methods as tools the model can call, chain multiple tools together, and handle errors safely. Then you’ll plug into Model Context Protocol (MCP)—an open standard that lets your AI talk to file systems, Git repositories, and databases (often via Docker) using a consistent, reusable pattern.

Upcoming Events

Click on an event below to learn more and register for individual events.

All times in - Coordinated Universal Time

Feb

12

Thursday

2026

Introduction to LangChain4j

5:00 PM - 6:00 PM (UTC)

Build your first AI-powered Java application from scratch. You'll connect to Azure OpenAI GPT-5, send your first prompts, and discover why memory transforms a simple demo into a production-ready conversational AI. See the dramatic difference between stateless and stateful chat side-by-side, and learn how tokens and context windows shape everything your AI can do.

  • Format:
  • alt##LivestreamLivestream

Topic: Coding, Languages, and Frameworks

Language: English

Details

Feb

19

Thursday

2026

Prompt Engineering with LangChain4j

5:00 PM - 6:00 PM (UTC)

The same AI gives wildly different results based on how you ask. Master eight prompting patterns that control GPT-5's reasoning depth, from quick calculations to deep architectural analysis. Learn to write self-reflecting prompts that iterate until code meets quality criteria, structured analysis frameworks for consistent reviews, and chain-of-thought techniques that reveal the AI's reasoning process.

  • Format:
  • alt##LivestreamLivestream

Topic: Coding, Languages, and Frameworks

Language: English

Details

Feb

26

Thursday

2026

Data-Driven Apps with RAG with LangChain4j

5:00 PM - 6:00 PM (UTC)

Your AI only knows what it learned during training—until you give it access to your documents. Build a complete Retrieval-Augmented Generation system that chunks documents, creates semantic embeddings, and finds relevant context for every question. Watch your AI answer questions about your own files with source citations and confidence scores, grounded in facts rather than hallucinations.

  • Format:
  • alt##LivestreamLivestream

Topic: Coding, Languages, and Frameworks

Language: English

Details

Mar

05

Thursday

2026

Tooling and MCP with LangChain4j

5:00 PM - 6:00 PM (UTC)

Transform your AI from a text generator into an autonomous agent that takes real action. Build custom tools the AI decides when to use, chain multiple operations together, and handle failures gracefully. Then discover the Model Context Protocol—an open standard for shareable AI tools—and connect to ecosystem servers for file systems, Git repositories, and databases running in Docker containers.

  • Format:
  • alt##LivestreamLivestream

Topic: Coding, Languages, and Frameworks

Language: English

Details

Mar

12

Thursday

2026

Safety, Reliability & Best Practices in LangChain4j

4:00 PM - 5:00 PM (UTC)

Learn how to build safe, reliable, and enterprise-ready AI applications in Java, including how to protect API keys and model endpoints, validate tool output, enforce content filters, and keep LLMs from stepping outside their intended boundaries. See how to design prompts defensively, restrict system capabilities, and use structured interfaces to avoid injection attacks. We'll also explore patterns for safe RAG, secure memory, and audit-ready logging that make your Langchain4j applications trustworthy, enterprise-grade, and ready for real users.Learn how to build safe, reliable, and enterprise-ready AI applications in Java, including how to protect API keys and model endpoints, validate tool output, enforce content filters, and keep LLMs from stepping outside their intended boundaries. See how to design prompts defensively, restrict system capabilities, and use structured interfaces to avoid injection attacks. We'll also explore patterns for safe RAG, secure memory, and audit-ready logging that make your Langchain4j applications trustworthy, enterprise-grade, and ready for real users.

  • Format:
  • alt##LivestreamLivestream

Topic: Coding, Languages, and Frameworks

Language: English

Details

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