LangChain4j: The Alternative JVM AI Stack
Spring AI isn't the only serious option on the JVM. LangChain4j's declarative AiServices, its RAG and agent tooling, and a concrete decision framework for choosing between Spring AI, LangChain4j, and Embabel.
AiServices: LangChain4j's Declarative Alternative to ChatClient
Everything from the first two guides of this roadmap, rebuilt with LangChain4j's AiServices — a declarative Java interface instead of a fluent builder, with real code comparisons throughout.
Tools, RAG & Agents in LangChain4j
Give a LangChain4j AiService the same superpowers this roadmap built with Spring AI — tool calling, retrieval-augmented generation, and LangChain4j's own composable agentic workflow builders.
Choosing Between Spring AI, LangChain4j & Embabel
A concrete decision framework for three JVM AI stacks — and proof that the real answer is often 'both,' with a LangChain4j AiService and a Spring AI ChatClient living in the same application.