Why it matters

Haystack is production Python RAG. Java interop pattern applies broadly.

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The architecture

Haystack Python service.

REST/gRPC surface.

Java client consumes.

Haystack + Java interopHaystack PythonRAG pipelineREST / gRPCsurfaceJava clientconsumerPattern applies to Haystack, LlamaIndex, DSPy, other Python frameworks
Haystack interop.
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How it works end to end

Haystack pipelines: RAG, agent, custom.

Expose via FastAPI / gRPC.

Java consumes via HTTP client.