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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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Claude
2026-10-11 10:09:45 +00:00
parent d51ef56468
commit e79b75a105
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langchain4j-interop/output/03-tool-throws.txt
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# A tool that throws (ORD-500 raises IllegalStateException: order database unavailable)
Case 1: a well-behaved model. It asks for the tool once, then answers from whatever the tool message says.
Spring AI : 2 requests, tool body ran 1 time(s). Tool message the model received: "order database unavailable"
answer: Done: order database unavailable
LangChain4j : 2 requests, tool body ran 1 time(s). Tool message the model received: "order database unavailable"
answer: Done: order database unavailable
Case 2: an insistent model. It asks for the tool again after every result. The server stops it with an HTTP 500 after 30 requests.
Spring AI : 31 requests, tool body ran 30 time(s)
exception InternalServerException: 500: cutoff reached
LangChain4j : 31 requests, tool body ran 30 time(s)
exception InternalServerException (root: HttpException): {"error":{"message":"cutoff reached"}}
Case 3: the same insistent model, each framework asked to stop after 5 tool rounds.
Spring AI (ToolCallingAdvisor + our MaxToolRounds(5) checker): 6 requests, tool body ran 5 time(s)
answer:
LangChain4j (maxSequentialToolsInvocations(5)) : 6 requests, tool body ran 5 time(s)
exception RuntimeException: Something is wrong, exceeded 5 tool calling round trips (maxToolCallingRoundTrips)