LangChain4j Vertex AI Integration

LangChain4j integration for Google Vertex AI. Provides Java APIs for chat, language, embedding, image, and scoring models.

Installation

<dependency>
    <groupId>dev.langchain4j</groupId>
    <artifactId>langchain4j-vertex-ai</artifactId>
    <version>1.11.0-beta19</version>
</dependency>

Quick Start

VertexAiChatModel model = VertexAiChatModel.builder()
    .endpoint("https://us-central1-aiplatform.googleapis.com/v1/")
    .project("your-project-id")
    .location("us-central1")
    .publisher("google")
    .modelName("chat-bison@001")
    .build();

Models

• Chat Model - Conversational AI (chat-bison, gemini)
• Language Model - Text generation (text-bison)
• Embedding Model - Text embeddings (text-embedding-004)
• Image Model - Image generation (imagegeneration@006)
• Scoring Model - Text ranking (semantic-ranker-512)

Setup & Reference

• Installation | Authentication | Configuration
• Quick Reference - All models at a glance
• SPI Factories - Dependency injection integration