MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring

Learn how to use modelcontextprotocol/java-sdk across core Java and Spring stacks, from transport setup to conformance and production hardening.

Why This Track Matters

Java teams often need MCP in existing backend estates with strict reliability and observability requirements. The official Java SDK provides a practical path with modular transport implementations and Spring ecosystem integration.

This track focuses on:

• selecting module boundaries (mcp, mcp-core, mcp-spring) with minimal friction
• understanding reactor-first design with sync facades
• deploying client/server transports across stdio, servlet, and Spring stacks
• validating behavior through conformance and contribution workflows

Current Snapshot (auto-updated)

• repository: modelcontextprotocol/java-sdk
• stars: about 3.5k
• GitHub release reference: v1.1.2 (checked 2026-06-08; release metadata on GitHub)

Mental Model

flowchart LR
    A[Java app] --> B[mcp module]
    B --> C[mcp-core APIs]
    C --> D[Stdio + JDK HTTP + Servlet]
    B --> E[mcp-spring]
    E --> F[WebFlux or WebMVC]

Chapter Guide

Chapter	Key Question	Outcome
01 - Getting Started and Module Selection	Which modules should I use first?	Correct dependency baseline
02 - SDK Architecture: Reactive Model and JSON Layer	Why is the SDK reactive-first and how is JSON handled?	Better architectural decisions
03 - Client Transports and Connection Strategy	How should Java clients connect across local and remote servers?	More reliable client behavior
04 - Server Transports and Deployment Patterns	Which server transport/runtime combination fits my deployment?	Cleaner deployment design
05 - Tools, Resources, Prompts, and Schema Validation	How do I model high-quality primitives in Java?	Stronger server interfaces
06 - Security, Authorization, and Runtime Controls	How do I apply auth and transport security controls safely?	Lower security risk
07 - Conformance Testing and Quality Workflows	How do I verify behavior against protocol expectations?	More predictable releases
08 - Spring Integration and Upgrade Strategy	How do I evolve Java/Spring MCP deployments over time?	Long-term maintainability

What You Will Learn

• how to map Java SDK modules to different deployment constraints
• how to use transport providers without mixing incompatible assumptions
• how to harden runtime behavior and validate it with conformance loops
• how to combine core SDK and Spring integrations with less migration risk

Source References

• Java SDK README
• Core Bundle README
• Spring WebFlux README
• Spring WebMVC README
• Conformance Client README
• Conformance Server README
• Security Policy
• Contributing Guide

Related Tutorials

• MCP Specification Tutorial
• MCP TypeScript SDK Tutorial
• MCP Go SDK Tutorial
• MCP C# SDK Tutorial

---

Start with Chapter 1: Getting Started and Module Selection.

Navigation & Backlinks

• Start Here: Chapter 1: Getting Started and Module Selection
• Back to Main Catalog
• Browse A-Z Tutorial Directory
• Search by Intent
• Explore Category Hubs

Full Chapter Map

1. Chapter 1: Getting Started and Module Selection
2. Chapter 2: SDK Architecture: Reactive Model and JSON Layer
3. Chapter 3: Client Transports and Connection Strategy
4. Chapter 4: Server Transports and Deployment Patterns
5. Chapter 5: Tools, Resources, Prompts, and Schema Validation
6. Chapter 6: Security, Authorization, and Runtime Controls
7. Chapter 7: Conformance Testing and Quality Workflows
8. Chapter 8: Spring Integration and Upgrade Strategy

Generated by AI Codebase Knowledge Builder