Structured output with LangChain4j and Ollama

This example shows LangChain4j returning a typed Java record from a local Ollama model.

The record declares the expected shape, LangChain4j derives a JSON schema from it, and the response arrives as a validated object.

Requirements

• Java 21+
• Maven 3.9+
• Ollama installed locally
• A pulled chat model such as llama3.2:1b

Steps for running this example in the shell

1. Start Ollama and pull the model:

ollama serve
ollama pull llama3.2:1b

2. Run the application:

mvn compile exec:java

Output

ReleaseSummary[title=Release Readiness Check, priority=High, nextStep=Fix flaky integration tests]