Kevin Dubois
Infusing Generative AI in your Java Apps with LangChain4j
#1about 3 minutes
Integrating generative AI into Java applications with LangChain4j
LangChain4j simplifies consuming AI model APIs for Java developers, avoiding the need for deep data science expertise.
#2about 3 minutes
Creating a new Quarkus project with LangChain4j
Use the Quarkus CLI to bootstrap a new Java application and add the necessary LangChain4j dependency for OpenAI integration.
#3about 2 minutes
Using prompts and AI services in LangChain4j
Define AI interactions using the @RegisterAIService annotation, system messages for context, and user messages with dynamic placeholders.
#4about 2 minutes
Managing conversational context with memory
LangChain4j uses memory to retain context across multiple calls, with the @MemoryId annotation enabling parallel conversations.
#5about 2 minutes
Connecting AI models to business logic with tools
Use the @Tool annotation to expose Java methods to the AI model, allowing it to execute business logic like sending an email.
#6about 5 minutes
Live demo of prompts, tools, and the Dev UI
A practical demonstration shows how to generate a haiku using a prompt and then use a custom tool to send it via email, verified with Mailpit.
#7about 3 minutes
Providing custom knowledge with retrieval-augmented generation (RAG)
Enhance LLM responses with your own business data by using an embedding store or Quarkus's simplified 'Easy RAG' feature.
#8about 6 minutes
Building a chatbot with a custom knowledge base
A chatbot demo uses a terms of service document via RAG to correctly enforce a business rule for booking cancellations.
#9about 2 minutes
Using local models and implementing fault tolerance
Run LLMs on your local machine with Podman AI Lab and make your application resilient to failures using SmallRye Fault Tolerance annotations.
#10about 4 minutes
Demonstrating fault tolerance with a local LLM
A final demo shows an application calling a locally-run model and triggering a fallback mechanism when the model service is unavailable.
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