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LangGraph4j

Java library for stateful, multi-agent LLM applications built as cyclical graphs, designed to work with langchain4j and Spring AI.

Harness by LangGraph4j

IndexedMIT★ 2,065
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About

LangGraph4j is a Java library for building stateful, multi-agent applications with LLMs, inspired by the Python LangGraph library. Applications are defined as graphs with nodes, conditional edges and cycles, with shared state that can be checkpointed and replayed. It supports asynchronous and streaming execution, PlantUML and Mermaid graph diagrams, and a web studio for running and debugging graphs.

Use cases: agent-orchestration

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Fact sheet

Languages
JavaREADME
Packages
org.bsc.langgraph4j:langgraph4j-core (maven)README
Multi-agent
YesREADME
Orchestration
graphREADME
Streaming
YesREADME
Memory
short-term, long-termREADME
Maturity
StableREADME

Facts extracted by Claude Haiku 5.5 from the linked sources on Oct 24, 2026. Wrong fact? Tell us.

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    Featured in

    Signals

    Stars
    2,065
    Forks
    291
    Open issues
    23
    Last commit
    Oct 18, 2026 (12 days ago)
    Last release
    Oct 18, 2026 (12 days ago)

    From GitHub (fetched Oct 24, 2026).

    Details

    Packages
    maven org.bsc.langgraph4j:langgraph4j-core
    License
    MIT
    Repository
    github.com/langgraph4j/langgraph4j
    Website
    langgraph4j.github.io/langgraph4j/
    First seen
    Oct 24, 2026
    Last checked
    Oct 24, 2026
    Source
    READMEgithub-graphql

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    Cite this page

    LangGraph4j. Agent Mart. https://agentmart.dev/harnesses/langgraph4j (last updated 2026-10-24)