demo.java

///usr/bin/env jbang "$0" "$@" ; exit $?
//DESCRIPTION This is a simple example of using the LangChain4J Quarkus extension to create a simple AI service that answers questions.
//DESCRIPTION This example works with both InstructLab by default, adjust url for Podman AI Lab and remove url for OpenAI.

//DEPS io.quarkus.platform:quarkus-bom:3.9.3@pom
//DEPS io.quarkiverse.langchain4j:quarkus-langchain4j-core:RELEASE
//DEPS io.quarkiverse.langchain4j:quarkus-langchain4j-openai:RELEASE

//JAVAC_OPTIONS -parameters
//JAVA_OPTIONS -Djava.util.logging.manager=org.jboss.logmanager.LogManager 
//JAVA_OPTIONS -Dquarkus.langchain4j.openai.base-url=http://localhost:8000/v1
//JAVA_OPTIONS -Dquarkus.langchain4j.openai.api-key=sk-dummy
//JAVA_OPTIONS -Dquarkus.langchain4j.openai.timeout=60s

import dev.langchain4j.service.SystemMessage;
import dev.langchain4j.service.UserMessage;
import io.quarkiverse.langchain4j.RegisterAiService;
import io.quarkus.logging.Log;
import io.quarkus.runtime.QuarkusApplication;
import io.quarkus.runtime.annotations.QuarkusMain;
import jakarta.enterprise.context.control.ActivateRequestContext;
import jakarta.inject.Inject;

@QuarkusMain    
public class demo implements QuarkusApplication {

    @RegisterAiService
    public interface AiService {
    
        @SystemMessage("You are a helpful assistant")
        @UserMessage("{question}")
        String request(String question);
    }

    @Inject
    AiService ai;

    @Override
    @ActivateRequestContext
    public int run(String... args) throws Exception {
        Log.info(ai.request("What is the capital of Denmark?"));
        return 0;
    }
}