Why it matters

LangGraph4j brings LangGraph patterns to Java. Understanding shapes design.

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The architecture

Graph: nodes + edges.

State: shared across nodes.

Conditional edges: dynamic routing.

LangGraph4j structureNodesstate transformsStateshared objectConditional edgesdynamic routingJava port lets Java devs use LangGraph patterns without Python
LangGraph4j.
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How it works end to end

Define state schema.

Add nodes + edges.

Conditional routing: functions decide next node.

Persistence via checkpointing.