spring-ai-demo

Langfuse Spring AI Demo Application

Prerequisites

• Java 21+
• Langfuse stack (Cloud or Self-Hosted)
• Langfuse API Keys
• An OpenAI Api Key

How to run

1. Configure environment variables to connect Spring AI demo app with Langfuse.

   export SPRING_AI_OPENAI_APIKEY="sk-proj-xxx"
   export OTEL_EXPORTER_OTLP_ENDPOINT="https://cloud.langfuse.com/api/public/otel" # 🇪🇺 EU data region
   # export OTEL_EXPORTER_OTLP_ENDPOINT="https://us.cloud.langfuse.com/api/public/otel" # 🇺🇸 US data region
   # export OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:3000/api/public/otel" # 🏠 Local deployment (>= v3.22.0)
   export OTEL_EXPORTER_OTLP_HEADERS="Authorization=Basic $(echo -n "pk-lf-xxx:sk-lf-xxx" | base64)"
   

2. Run the sample application with ./mvnw clean install spring-boot:run.
3. Call the chat endpoint with curl localhost:8080/v1/chat.
4. Observe the new trace in the Langfuse web UI.