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Add langgraph4j module: a loan-approval graph with checkpoints and human-in-the-loop on LangGraph4j 1.9.5

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjfyTgmERTWLqzafu34Cth
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asmhatre
2026-10-14 06:47:05 +00:00
co-authored by Claude Sonnet 5.5
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langgraph4j/README.md
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# langgraph4j
Companion code for *LangGraph4j: Stateful Agent Graphs in Java* on [ankurm.com](https://ankurm.com).
A loan-approval agent drawn as a graph with conditional routing, checkpoints, a human-in-the-loop
pause and resume, and per-thread state. No model and no API key: every node is deterministic so the
run is reproducible; swapping `assessRisk` for a model call changes one lambda.
```bash
mvn test -pl langgraph4j # rewrites output/*.txt
```
| File | Role |
|---|---|
| `LoanState` | The shared state: typed accessors over a map, with an appender channel for the audit trail |
| `LoanGraph` | Nodes, edges, the conditional route on risk, `interruptBefore("humanReview")`, the checkpoint saver |
| `LoanGraphTest` | Five tests; each writes the matching `output/NN-*.txt` and asserts the same facts |
Verified against `org.bsc.langgraph4j:langgraph4j-core` **1.9.5**, JDK 25, JUnit 6.1.3. The article carries
the explanations; there is no `docs/` folder.