LangChain4j: A Java library for integrating AI/LLM capabilities into Java applications

LangChain4j is a Java library , (similar to Langchain for python and javascript) that simplifies integrating AI/LLM capabilities into Java applications. It offers an API for various LLM providers and embedding stores. LangChain4j also includes tools for working with LLMs. Some of the features of LangChain4j include AI services, sentiment analysis, and information extraction. The library is still under active development, but the core functionality is available.

Quick Overview

LangChain4j is a Java library that provides a unified API for accessing various large language models (LLMs) and embedding stores. LLMs are a type of artificial intelligence (AI) that are trained on a massive amount of text data. This allows them to generate text, translate languages, write different kinds of creative content, and answer your questions in an informative way. Embedding stores are databases that store pre-computed embeddings for words and phrases. These embeddings can be used to improve the performance of LLMs.

What can LangChain4j do?

LangChain4j can be used to do a variety of things, including:

• Accessing various LLM providers and embedding stores
• Performing AI services such as sentiment analysis and information extraction
• Work with LLM embeddings

How to use LangChain4j

LangChain4j is a relatively new library, so there is not a lot of documentation available yet. However, there are a few examples on the LangChain4j GitHub repository that show how to use the library.

Here is a simple example of how to use LangChain4j to access an LLM provider and generate text —

import io.langchain.core.LangChain;
import io.langchain.core.config.Config;

public class LangChain4jExample {

  public static void main(String[] args) throws Exception {
    // Configure LangChain4j
    Config config = new Config();
    config.setProvider("openai"); // Set the LLM provider
    config.setApiKey("YOUR_OPENAI_API_KEY"); // Set your OpenAI API key

    // Create a LangChain instance
    LangChain langChain = new LangChain(config);

    // Generate text
    String text = langChain.generateText("Hello, world!", 100);

    // Print the generated text
    System.out.println(text);
  }

This code snippet first configures LangChain4j to use the OpenAI LLM provider. Then, it creates a LangChain instance and uses it to generate text.

Conclusion

LangChain4j is a new library that can be used to integrate AI/LLM capabilities into Java applications. The library is still under active development, but the core functionality is available. If you are looking for a way to add AI capabilities to your Java applications, LangChain4j is a good option to consider.

I hope this article helps! Please let me know if you have any other questions.

Sources

1. https://github.com/langchain4j