langchain4j/langchain4j

Vector Databases

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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GitHub Metrics

Stars

10.9k

Forks

2.0k

Open Issues

653

Watchers

110

Contributors

363

Weekly Commits

Language

Java

License

Apache-2.0

Last Commit

Mar 2, 2026

Created

Jun 20, 2023

Latest Release

1.11.0

Release Date

Feb 4, 2026

Synced: Mar 3, 2026

Quality Scores

Documentation Qualityw: 20%

0.0

Community Healthw: 20%

0.0

Maintenance Velocityw: 15%

0.0

API Design & DXw: 20%

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Production Readinessw: 15%

0.0

Ecosystem Integrationw: 10%

0.0