langgraph4j/

langgraph4j

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LangGraph4j is a Java library for building stateful, multi-agent workflows that integrate with LangChain4j and Spring AI. It supports persistent checkpoints, visual debugging, and modular modules; latest release is 1.8.22 as of Aug 3, 2026.

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258forks

24issues

MITlicense

2024since

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Reviewgenerated from repository data · Aug 5, 2026

What it is

LangGraph4j is a Java library for building stateful, multi-agent applications with LLMs. It is designed to work with LangChain4j and Spring AI.

How it works

Core concepts include StateGraph<S extends AgentState>, AgentState with a Map-based schema, Nodes (actions), Edges (flow control), and Checkpoints for persistence. Graphs are compiled into a runnable CompiledGraph. Persistence is via various saver modules (e.g., MySQL, PostgreSQL, Redis, SQLite, etc.).

Getting started

Installation

<properties>
    <langgraph4j.version>1.8.22</langgraph4j.version> <!-- Check for the actual latest version -->
</properties>

<dependencies>
    <dependency>
        <groupId>org.bsc.langgraph4j</groupId>
        <artifactId>langgraph4j-core</artifactId>
    </dependency>
    <!-- Add other langgraph4j modules if needed, e.g., langgraph4j-langchain4j -->
</dependencies>

Example guidance

The README provides a sample demonstrating a two-node graph (greeter and responder) that updates a shared state with messages and shows how to define the state, nodes, and graph compilation. It also notes Java 17+ baseline and the presence of multiple saver modules for persistence.

Recent releases

Latest releases shown:

v1.8.22 (2026-08-03): Features include sqllite-saver module addition to the project.
v1.8.21 (2026-07-31): ALM bump to 1.8.21.
v1.9.0-beta1 (2026-07-17): Beta release with What's new link.
v1.8.20 (2026-06-27): Features include Hazelcast checkpoint saver addition.
v1.8.19 (2026-06-16): Bug fixes for lancchain4j-agent.

Traction

Stars: 1878 Forks: 258 Open issues: 24

Behind the repo

Not provided in the README excerpt.

Caveats

MIT license is stated. Java 17+ baseline is recommended. Multiple modules exist for different storage backends (e.g., MySQL, PostgreSQL, Redis, SQLite, Hazelcast).

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