Claude
e79b75a105
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
langchain4j-interop
Companion code for Spring AI vs LangChain4j in 2026: Is the Pairing Still Worth It?, part of the Spring AI series 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/.
| 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
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.