Java MCP Server examples are incomplete and non-runnable

Bug description

The current documentation examples for the Java MCP Server are incomplete and non-functional. Dependencies referenced in the code snippets cannot be resolved, and critical components (e.g., main class, configuration, or entry point) are missing. There is no working “Hello World” example to verify basic setup and functionality, making it impossible for new users to get started.

Environment

Spring MCP version: 0.16.0 with webflux implementation
Java version: Java 11
Build tool: Maven
IDE: Eclipse

Steps to reproduce

Go to the official Spring MCP documentation (e.g., https://modelcontextprotocol.io/sdk/java/mcp-server).
Copy the provided code snippets with webflux stateless into a new Java project.
Attempt to compile or run the code.
Observe unresolved dependencies

Expected behavior

The documentation should provide a complete, minimal, and runnable Java example that:

Includes all necessary dependencies (with Maven/Gradle snippets).
Contains a working demo example.
Demonstrates a basic “Hello World” endpoint or service.
Can be copied, pasted, and run immediately without additional research or guessing.
Minimal Complete Reproducible example

从 https://modelcontextprotocol.io/sdk/java/mcp-server 的 Java MCP Server 文档开始，检查 WebFlux stateless 代码片段、其 Maven 依赖，以及缺失的配置或入口点。完成的标准是：文档包含一个完整的最小 Java 11 Hello World 示例，具有可解析的依赖和足够的设置，使其无需进一步研究即可复制、编译和运行。