LangChain4j Tile

Overview

This tile provides comprehensive, production-ready documentation for LangChain4j (version 1.11.0), a Java library for building LLM-powered applications.

Tile Information

• Name: tessl/maven-dev-langchain4j--langchain4j
• Version: 1.11.0
• Describes: pkg:maven/dev.langchain4j/langchain4j@1.11.0
• Documentation Entry Point: docs/index.md

What's Included

This tile documents the following LangChain4j capabilities:

Core APIs

• AI Services - High-level interface for building AI-powered services
• Chat Models - Interface for chat interactions (synchronous and streaming)
• Memory - Conversation history management
• Messages - Chat message types and structures
• Request/Response - Request and response handling with metadata

Advanced Features

• RAG (Retrieval Augmented Generation) - Context retrieval and augmentation
• Tools - Function calling and tool execution
• Prompts - Template-based prompt engineering
• Guardrails - Input/output validation and moderation
• Output Parsing - Structured output extraction

Data Processing

• Document Processing - Loading, parsing, and chunking documents
• Embedding Store - Vector database integration
• Data Types - Core data structures (Document, TextSegment, etc.)
• Classification - Text classification using embeddings

Infrastructure

• Chains - Sequential processing workflows
• SPI (Service Provider Interface) - Extension points

Documentation Structure

docs/
├── index.md              # Main entry point with quick start guide
├── ai-services.md        # AI Services API and patterns
├── models.md             # Chat models and embeddings
├── memory.md             # Conversation memory management
├── messages.md           # Message types and handling
├── request-response.md   # Request/response structures
├── prompts.md            # Prompt templates and engineering
├── rag.md                # Retrieval Augmented Generation
├── tools.md              # Function calling and tools
├── guardrails.md         # Validation and moderation
├── output-parsing.md     # Structured output extraction
├── document-processing.md # Document handling
├── embedding-store.md    # Vector databases
├── data-types.md         # Core data structures
├── classification.md     # Text classification
├── chains.md             # Processing chains
└── spi.md                # Service provider interfaces

Documentation Quality

This tile provides:

• ✅ Complete API Coverage - All public APIs documented
• ✅ Production Patterns - Real-world usage examples
• ✅ Thread Safety - Concurrency guidance for all APIs
• ✅ Error Handling - Exception patterns and recovery
• ✅ Performance - Optimization tips and best practices
• ✅ Cost Considerations - API usage and cost implications
• ✅ Common Pitfalls - Known issues and solutions
• ✅ Edge Cases - Boundary conditions documented

Usage

This tile is designed for AI agents building Java applications with LangChain4j. The documentation includes:

1. Quick Start Examples - Get started fast with common patterns
2. Comprehensive API Reference - Detailed method signatures and behavior
3. Usage Examples - Real-world code samples for every API
4. Testing Patterns - How to test LangChain4j applications
5. Best Practices - Production-ready patterns and anti-patterns
6. Troubleshooting - Common issues and solutions

Context Cost

• Total Content: 228.8k tokens
• Front-loaded: 300 tokens
• Documentation Files: 17 files

The documentation is organized hierarchically for optimal context usage, with the most commonly needed information front-loaded.

Installation

Add to your Maven project:

<dependency>
    <groupId>dev.langchain4j</groupId>
    <artifactId>langchain4j</artifactId>
    <version>1.11.0</version>
</dependency>

Related Resources

• Official LangChain4j Documentation
• LangChain4j GitHub Repository
• LangChain4j Examples

License

This documentation tile is provided for use with Tessl. LangChain4j itself is licensed under the Apache License 2.0.

Tile Validation

This tile has been validated with tessl tile lint and is production-ready:

✔ No broken links ✔ No orphaned files ✔ Complete documentation tree ✔ All references resolved ✔ Proper metadata in tile.json