Why it matters

LlamaIndex patterns influence RAG design. Interop shapes RAG stack.

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The architecture

Adopt: Node, Document, VectorStoreIndex abstractions.

Java equivalents.

LlamaIndex-style RAGDocumentinputNodechunkVectorStoreIndexretrievalJava has LangChain4j equivalents; adopt naming + patterns
RAG pattern.
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How it works end to end

Document → Node → embed → index → query.

Retrieval + generation.

Java: LangChain4j implements similar.