Why it matters
LangChain4j is standard Java LLM library. Understanding shapes design.
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The architecture
ChatLanguageModel abstraction.
Providers: OpenAI, Anthropic, Ollama, etc.
Modules: RAG, agents, memory.
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How it works end to end
Maven / Gradle: langchain4j core + provider modules.
Spring Boot integration available.
Quarkus integration.