Why it matters

LangChain4j is widely adopted. Interop shapes ecosystem play.

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The architecture

Adapter pattern: bridge ADK to LangChain4j.

Shared abstractions: ChatModel, Tool.

LangChain4j integrationADK JavacoreAdapterbridgeLangChain4jframeworkAdapters translate between ADK + LangChain4j abstractions
Interop pattern.
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How it works end to end

Wrap LangChain4j ChatModel as ADK LLMClient.

Use LangChain4j tools inside ADK agents.

Vice versa.