RAG with LangChain4j & Spring AI 2.0

How to implement RAG on current Java stacks — LangChain4j Easy/Advanced RAG vs Spring AI 2.0 QuestionAnswerAdvisor and RetrievalAugmentationAdvisor.

Langchain4j · Implement

Easy RAG — langchain4j-easy-rag ingest magic

Spring AI 2.0 · Implement

Ingest → VectorStore (Boot auto-config)

When To Pick Which

LC4j — Quarkus, plain Java, or you want every RAG piece explicit

Don’T Skip

Idempotent re-ingest + chunk versioning