LangChain4j

Abstracts over 20+ LLM providers and 30+ embedding stores, enabling easy switching between services without code changes, as stated in the README's introduction.

Offers both low-level utilities like prompt templating and high-level patterns such as Agents and RAG, with multiple implementations for each abstraction, as highlighted in the toolbox section.

Seamlessly integrates with Spring Boot, Quarkus, Helidon, and Micronaut, with specific examples and dependencies provided in the code examples section.

Continuously incorporates new techniques and integrations from the community, ensuring the library stays current, as noted in the philosophy and active development mentions.