LLM Development Library
11.8k 2026-04-26
langchain4j/langchain4j
An idiomatic, open-source Java library simplifying the integration of Large Language Models (LLMs) into JVM applications with unified APIs and a comprehensive toolbox.
Core Features
Unified APIs for over 20 LLM providers and 30 embedding stores.
Comprehensive toolbox for RAG, Agents, tool calling, and chat memory management.
Designed with idiomatic Java conventions, including type safety and dependency injection.
Seamless integration with enterprise Java frameworks like Spring Boot and Quarkus.
Detailed Introduction
LangChain4j is a dedicated open-source Java library addressing the need for robust LLM integration within the JVM ecosystem. Unlike a direct port, it's built from the ground up with Java conventions, offering a unified API to abstract various LLM providers and vector stores. It provides a rich set of tools for common LLM patterns like RAG and Agents, enabling developers to quickly build sophisticated AI-powered applications. Its first-class integration with popular Java frameworks makes it an essential tool for enterprise Java developers venturing into AI.