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Add langchain4j-interop: Spring AI 2.0 and LangChain4j 1.22 side by side

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Same order assistant in both frameworks against a local fake OpenAI
server: starter bean collision, wire differences, tool failure and loop
bounds, observability meters, MCP-first tools, and a compile check of
the 2025 article's snippets and Maven coordinates.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01G8ikz8xdWuTP5yun8DZ1hk
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2026-10-11 10:09:45 +00:00
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# langchain4j-interop
Companion code for [Spring AI vs LangChain4j in 2026: Is the Pairing Still Worth It?](https://ankurm.com/spring-ai-langchain4j-production-ai-microservices-java/), part of the [Spring AI series](../README.md) on ankurm.com.
One order-support assistant built twice, once with Spring AI 2.0.1 and once with LangChain4j 1.22.0, in one Spring Boot 4.1.1 project, against a local fake OpenAI server (no vendor API is called). The tests answer five questions and `scripts/compile-old-snippets.sh` answers a sixth. Every figure in the article is quoted from a file in [`output/`](output).
| File | Question |
|---|---|
| `01-both-starters.txt` | What happens when both OpenAI starters are on the classpath? |
| `02-same-assistant.txt` | Same assistant, same question: what differs on the wire? |
| `03-tool-throws.txt` | A tool that throws, and a model that will not stop calling it: what bounds the loop? |
| `04-observability.txt` | Which meters does each framework record? |
| `05-mcp-first.txt` | One MCP tool server consumed from both frameworks |
| `06-old-code-vs-current.txt` | Which lines from the original (2025) article still compile, and do its Maven coordinates still exist? |
## Versions
Spring Boot 4.1.1, Spring AI 2.0.1, LangChain4j 1.22.0 (`langchain4j-open-ai-spring-boot4-starter` and `langchain4j-spring-boot4-starter` are 1.22.0-beta32, beta only), Java 25.
## Run
```bash
scripts/run-all.sh # tests -> output/01..05, then the old-snippet check -> output/06
```
No services are needed. Script 06 looks up Maven Central (it retries on rate limiting); `src/broken/` holds the old snippets, one per file, which are compiled outside the main build on purpose.