langchain4j
LangChain4j is an open-source Java library that simplifies the integration of LLMs into Java applications through a unified API, providing access to popular LLMs and vector databases. It makes implementing RAG, tool calling (including support for MCP), and agents easy. LangChain4j integrates seamlessly with various enterprise Java frameworks.
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A self-hosted web UI that simplifies AI experimentation and testing for Java developers. It provides playgrounds for all major vector databases and MCP tools, supports intuitive interaction with LLMs, and enables rapid development and testing of RAG workflows, MCP integrations, and unified chat experiences.