A browser window with a chatbot and a data grid displaying flight booking details

This app is an AI-powered customer support application that:

• Has access to terms and conditions (retrieval augmented generation, RAG)
• Can access tools (Java methods) to perform actions
• Uses an LLM to interact with the user

The application includes implementations for:

• LangChain4j in the main branch
• Quarkus in the quarkus branch (thanks to @edeandrea!)
• Spring AI in the spring-ai branch (thanks to @tzolov!)
• Semantic Kernel in the semantic-kernel branch (thanks to @sohamda!)

The UI is built using Vaadin Hilla and the backend is built using Spring Boot.

• Java 17+
• OpenAI API key in OPENAI_API_KEY environment variable

Run the app by running Application.java in your IDE or mvn in the command line.

This demo was inspired by the LangChain4jCustomer Support Agent example.

I want to thank the LangChain4j, Quarkus, Spring AI, and Microsoft teams for their support in building this demo. Especially, I want to thank @edeandrea from the Quarkus team for his help in building the Quarkus implementation, @tzolov from The Spring AI team for his help in building the Spring AI implementation and @sohamda from Microsoft for the Semantic Kernel implementation.