Library
11.6k 2026-04-13
langchain4j/langchain4j
LangChain4j is an open-source Java library that simplifies the integration of Large Language Models (LLMs) into Java applications.
Core Features
Unified API for various LLM providers and embedding stores.
Comprehensive toolbox for LLM patterns like RAG, Agents, and function calling.
Seamless integration with popular enterprise Java frameworks (e.g., Spring Boot, Quarkus).
Extensive support for over 20 LLM providers and 30 embedding stores.
Detailed Introduction
LangChain4j emerged to fill the gap for a robust Java framework in the rapidly evolving LLM landscape. It provides a unified API that abstracts the complexities of integrating diverse LLM providers and vector databases, allowing developers to easily switch between them. The library offers a rich set of tools and established patterns, including Retrieval Augmented Generation (RAG) and Agents, to accelerate the development of sophisticated AI applications in Java, ensuring smooth integration with existing enterprise frameworks.