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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TranslatedMy RAG system, which can be used to import a knowledge base for knowledge Q&A, can integrate third-party MCP, and also has permission isolation, etc.