langchain4j
LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.
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Latest commit: 2026-08-21. Over the past 285 days, this repository gained 3.4k stars (+35.3% growth). Activity data is based on daily RepoPi snapshots of the GitHub repository.