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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/01-both-starters.txt
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# Both starters in one Spring Boot 4.1.1 application
Spring AI: spring-ai-starter-model-openai 2.0.1. LangChain4j: langchain4j-open-ai-spring-boot4-starter 1.22.0-beta32.
1. Both starters, nothing else:
FAILED: BeanDefinitionOverrideException: bean 'openAiChatModel' is defined twice, by org.springframework.ai.model.openai.autoconfigure.OpenAiChatAutoConfiguration and by dev.langchain4j.openai.spring.OpenAiAutoConfiguration
2. spring.autoconfigure.exclude=dev.langchain4j.openai.spring.OpenAiAutoConfiguration:
context started
bean chatClientBuilder -> org.springframework.ai.chat.client.ChatClient$Builder
bean openAiChatModel -> org.springframework.ai.openai.OpenAiChatModel
beans of type dev.langchain4j.model.chat.ChatModel: 0
beans of type org.springframework.ai.chat.model.ChatModel: 1
3. spring.main.allow-bean-definition-overriding=true:
context started
bean openAiChatModel -> org.springframework.ai.openai.OpenAiChatModel
bean chatClientBuilder -> org.springframework.ai.chat.client.ChatClient$Builder
beans of type dev.langchain4j.model.chat.ChatModel: 0
beans of type org.springframework.ai.chat.model.ChatModel: 1